Electroconductive Polymer Research Articles

Cytocompatible, Injectable, and Electroconductive Soft Adhesives with Hybrid Covalent/Noncovalent Dynamic Network.

Synthetic conductive biopolymers have gained increasing interest in tissue engineering, as they can provide a chemically defined electroconductive and biomimetic microenvironment for cells. In addition to low cytotoxicity and high biocompatibility, injectability and adhesiveness are important for many biomedical applications but have proven to be very challenging. Recent results show that fascinating material properties can be realized with a bioinspired hybrid network, especially through the synergy between irreversible covalent crosslinking and reversible noncovalent self‐assembly. Herein, a polysaccharide‐based conductive hydrogel crosslinked through noncovalent and reversible covalent reactions is reported. The hybrid material exhibits rheological properties associated with dynamic networks such as self‐healing and stress relaxation. Moreover, through fine‐tuning the network dynamics by varying covalent/noncovalent crosslinking content and incorporating electroconductive polymers, the resulting materials exhibit electroconductivity and reliable adhesive strength, at a similar range to that of clinically used fibrin glue. The conductive soft adhesives exhibit high cytocompatibility in 2D/3D cell cultures and can promote myogenic differentiation of myoblast cells. The heparin‐containing electroconductive adhesive shows high biocompatibility in immunocompetent mice, both for topical application and as injectable materials. The materials could have utilities in many biomedical applications, especially in the area of cardiovascular diseases and wound dressing.

CO2 capture through electro-conductive adsorbent using physical adsorption system for sustainable development.

The most critical energy and environmental challenge that our planet is facing today is to minimize the dependence on fossil fuels. Carbon dioxide may be of utmost significance as a solution of this issue through realization of carbon neutral energy cycle. Potentially, this could be achieved through the carbon dioxide capture as the urgent response to ongoing climate change. Activated carbon (AC) adsorption is one the most effective, environment friendly and techno-economic process for the carbon capture. In the current research, an electro-conductive-activated carbon was prepared by mixing powdered activated carbon (PAC) with an electro-conductive polymer (ECP). Different ratios of 0, 25, 50, 75 and 100wt% of ECP with PAC were used for the different analyses of activated carbons in a gas mixture of CO2/N2 using a physical adsorption system. Adsorption and desorption analyses, capacities of the process and desorption effects were examined. Electro-conductive polymers (ECP) were mixed with AC samples, where breakthrough time was increased up to 400% when mixed with the PAC for CO2 adsorption. Following adsorption analysis, desorption of activated carbons was conducted with different potentials. It was revealed that mixing could help the PAC sample to overcome the packing issue to increase the breakthrough capacity and the volumes before and after the breakthrough adsorption in the packed bed systems. The desorption rates of the PAC sample were also enhanced, and fast desorption was observed when mixed with ECP. It is envisioned that this method is very much promising carbon capture method for the techno-economic feasibility and sustainable development of the environment.

Elastic Cu@Ppy Sponge for Hybrid Device with Energy Conversion and Storage

Sponge is a kind of material which features amounts of micron-to-millimeter sized pores, whilst displays intriguing mechanic properties, such as foldable, rollable, and shapeable. The modified sponges have been widely applied in energy storage, sensors, photocatalysis and other fields, to name a few. As one kind of sponge, PDMS-based sponges possess numerous advantages, which hold great potential in fabricating flexible electronics, such as sensors. Firstly, the PDMS is low-cost, simple conduction and accessible in ordinary laboratories. Secondly, the PDMS has strong adhesiveness and chemical inertly. Moreover, the PDMS sponge is readily modifiable and tailorable for variable applications. Particularly, with the fast development of energy harvesting technique, the triboelectric nanogenerator (TENG), which is a powerful technique with low-cost, high efficiency, and environmentally friendly features, has been used to convert almost all forms of mechanical energy in our living/working environment into electricity. Recently, due to the specialities of PDMS, reports on the whole PDMS modification instead of only surface functionalization were documented, such as PDMS-based composites formation and filling with dielectric material, in which affirmed the importance of whole PDMS modification on improving the TENG output. Flexible supercapacitors (SCs) are distinctly important because of their higher power density, longer cycle life, and higher charge/discharge rates as compared with those of traditional batteries. Moreover, the flexible supercapacitors may adjust their conformations to accommodate the environmental variations while without remarkable loss in their electrochemical performance. In order to fabricate flexible supercapacitors, strain-tolerant electrodes with outstanding mechanical elasticity, high capacitance, and good durability are largely unmet and still intensely pursued. PPy, as an electroconductive polymer (ECP) with high conductivity, good environmental stability, and high theoretical gravimetric pseudocapacitance, has been widely applied in flexible supercapacitors. However, the conjugated PPy polymers are normally nonporous and not durable due to the decomposition after a number of charge-discharge cycles because of the swelling and shrinkage of linear macromolecular structures. Kinds of templating strategies or nanostructured supporting frameworks should be further developed to enhance the cycling stability of PPy and their specific capacitance. In this work, we demonstrated the successful fabrication of elastic TENG and SC by using Cu@PPy sponges. The Cu@PPy sponge firstly applied to fabricate single electrode TENG. The output of the TENG was optimized by varying the PPy content in the Cu sponge or hybridization of Cu@PPy with PDMS sponge. This work can significantly promote the understanding of the triboelectricity produced by the TENG from the view of materials and provides a facile way to enhance the performance of TENG by tuning the materials itself. The Cu@PPy supercapacitor achieves high performance and overcomes the insulating problems of sponge by electrochemically interweaving sponge with a conductive polymer PPy. The deposited PPy can efficiently improve the conductivity of sponge and enhance Faradaic processes across the interface. Therefore, such hybrid-structured electrodes take the advantages of both high EDLC capacitance originated from the internal surface areas of sponge and effective pseudocapacitance generated by PPy. The assembled SC device show excellent flexibility, which has been compressed to 50% of its initial thickness and folded 180°without loss of its performance. Furthermore, for the application of the TENG and the SC, we combined the as-fabricated S-TENG with SC and manufactured a self-powered hybrid energy storage suit. The three in series SCs can be charged to 2.4 V by the S-TENG section within 3059.6 s under 3 Hz and light a LED light, which opens great prospects for integrated devices in the future. To close, because of the elasticity, flexibility, and good electric conductivity of the Cu sponge, this porous metal sponge could open new opportunities for developing wearable personal electronics and integrated devices.

Monoclinic Na2.4V2(PO4)3/Conductive Polymer Composite As High Capacity Cathodes for Na-Ion Batteries

We report a monoclinic Na2.4V2(PO4)3/poly(3,4-ethylenedioxythiophene) (M-NVP/PEDOT) composite as a novel cathode material for sodium-ion batteries. The active materials were homogenously encapsulated by thin layers of the electro-conductive polymer PEDOT, and X-ray diffraction analysis indicated that the final products were crystallized into a monoclinic structure. The composite exhibited much more outstanding power capability and cyclability than pristine M-NVP. The discharge capacity of the M-NVP/PEDOT electrode was maintained up to ~109.8 mA h g-1 at 10C (1C = ~178 mA g-1), which was ~9 times higher than that of pristine M-NVP under the same conditions. Moreover, whereas severe capacity degradation was observed for pristine M-NVP, the M-NVP/PEDOT composite delivered ~81% capacity retention compared with the initial capacity over ~500 cycles at 1C. In particular, the available capacity of M-NVP/PEDOT was ~143.3 mA h g-1, corresponding to ~2.4 mol Na+ (de)intercalation, which is larger than the reversible capacity of rhombohedral Na3V2(PO4)3, at which only 2 mol Na+ can be (de)intercalated. This unexpectedly high capacity of the M-NVP/PEDOT composite was clearly confirmed through combined studies using several experiments and first-principles calculation. Figure 1

Electronic and Crystal Structures of Nitrogen-Containing Electroconductive and Electroactive Polymers

Current ideas about the electronic and crystal structures of nitrogen-containing conductive polymers are considered. A comparative critical analysis of literature data on electronic, vibrational, and NMR spectra for different nuclei, and X-ray diffraction data for various forms of polyaniline, polyphenylenediamine, and polypyrrole is presented. Particular attention is paid to the relationship between the electronic and crystal structure of nitrogen-containing polyconjugated systems and their electrical conductivity.

A Study on Non-Newtonian Transport Phenomena in Mhd Fluid Flow From a Vertical Cone With Navier Slip and Convective Heating

Abstract In the current study is to examine numerically the effects of presence of a radial magnetic field, slip and jump conditions on the steady two-dimensional free convective boundary layer flow over an external surface of a vertical cone for an electro-conductive polymer. A proper non-similarity transformation simplifies the system of partial differential equations into a system of ordinary differential equations. The collocation formula in the MATLAB software then solves the system of non-similarity equations. The finding results show that, a weak elevation in temperature is accompanied with the increase in the Carreau fluid parameter, whereas a significant acceleration in the flow is computed near the cone surface. The study is relevant to smart coating transport phenomena.

Copper plated graphite, carbon nanotubes and polyaniline effect on the properties of electroconductive polyethylene compositions

There have been presented electrophysical (electrical volume resistivity), mechanical (tensile strength and elongation at break) and rheological (melt flow index) features of polyethylene compositions filled by copper plated graphite, multiwall carbon nanotubes and polyaniline in this article. An increase in the volume content of electroconductive fillers in the polyethylene matrix results in a monotonically falling curves with a well-defined threshold of leakage. The decrease in tensile strength by ∼ 4 times and relative elongation by ∼ 7 times have been observed in the polyethylene composite films having copper plated graphite and polyaniline up to 30 % vol. The tensile strength for conductive polyethylene compositions filled by multiwall carbon nanotubes slightly increases by ∼ 1.1 times, but relative elongation decreases dramatically by ∼ 5 times. The melt flow index decreases with the increase of concentration by exponential law for the compositions filled by multiwall carbon nanotubes and polyaniline by ∼ 1.4 times and increases for copper plated graphite filled compositions by ∼ 2 times due lubricating effect. There has been developed technological process of production for electroconductive polymer composite materials based on polyethylene by pressing method.

Preparation and Properties of Highly Electroconductive and Heat-Resistant CMC/Buckypaper/Epoxy Nanocomposites.

Self-assembled buckypapers have been successfully prepared using sodium carboxyl methyl cellulose (CMC) as a binder. The lowest resistivity that was reached was 0.43 ± 0.03 Ω·m, when the buckypapers were prepared by the same mass of CMC and carboxy-modified carbon nanotubes (CNTs). A heat-resistant electroconductive nanocomposite with epoxy resin as the matrix and CMC/buckypapers as the reinforcement was fabricated by a resin impregnation molding technique. The effects of CMC/buckypaper layers on the conductivity, thermal stability, and mechanical and dynamic mechanical performance of the epoxy resin polymer nanocomposites were investigated. It was found that CMC/buckypapers hold great promise for improving the properties of nanocomposites, and the buckypapers’ performance can be enhanced by using modified CNTs to prepare them. The obtained nanocomposites showed an approximate 71.23% bending strength improvement (125.04 ± 5.62 MPa) and a 30.71% bending modulus improvement (5.83 ± 0.68 GPa), with an increased number of CMC/buckypaper layers. An enhanced degradation temperature and residual mass were also achieved for the nanocomposites when compared with a pure polymer. The nanocomposites with four CMC/buckypaper layers possessed the highest storage modulus (1934 MPa), which was approximately 60% higher than that of a neat polymer (1185 MPa). Therefore, CMC/buckypapers could be effectively used to manufacture heat-resistant electroconductive polymer nanocomposites with improved properties.

Numerical investigations on magnetic field modeling for Carreau non-Newtonian fluid flow past an isothermal sphere

In the current study, the effects of radial magnetic field, slip and jump conditions on the steady two-dimensional free convective boundary layer flow over an external surface of an isothermal sphere for an electro-conductive polymer are numerically studied. It is assumed that the studied fluid has a non-Newtonian rheological behavior and follows the Carreau fluid model. In this investigation, the formulation of the Carreau fluid model has been used first time for describing the present boundary layer problem, and then the resulting partial differential equations are transformed to ordinary differential equations by using non-similarity transformations. The obtained ordinary differential equations are solved numerically by a well-known method named as Keller-Box method. The finding results show that a weak elevation in temperature is accompanied with the increase in the Carreau fluid parameter, whereas a significant acceleration in the flow is computed near the sphere surface. It is shown also that an increase in the thermal slip parameter allows to strongly decrease both the skin friction coefficient and the local Nusselt number. The skin friction coefficient is also depressed with increasing magnetic body force parameter. Moreover, it is observed that an increase in the momentum slip parameter allows to decrease the skin friction coefficient, whereas the local Nusselt number is reduced with the increase in the Carreau fluid parameter. It is found also that the skin friction coefficient is increased with greater stream-wise coordinate, whereas the local Nusselt number is reduced with the increase in this parameter.

Hydromagnetic Flow of Heat and Mass Transfer in a Nano Williamson Fluid Past a Vertical Plate With Thermal and Momentum Slip Effects: Numerical Study

Abstract In this article, the study of heat, momentum and mass (species) transfer in an electro-conductive polymer on the external surface of a vertical plate. The effects of Brownian motion and thermophoresis are incorporated in the model in the presence of both heat and nanoparticle mass transfer convective conditions. The Williamson viscoelastic model is employed which is representative of certain industrial polymers. The non-dimensional, transformed boundary layer equations for momentum and energy are solved with the second order accurate implicit Keller box finite difference method under appropriate boundary conditions. The influence of Weissenberg number, magnetic body force parameter, thermal slip parameter, hydrodynamic slip parameter, stream wise variable and Prandtl number on thermo fluid characteristics are presented graphically and discussed. A weak elevation in temperature accompanies increasing Weissenberg number whereas a significant acceleration in the flow is computed near the plate surface. Rate of heat transfer is reduced with increases the Weissenberg number. The study is relevant to enrobing processes for electric-conductive nano-materials, of potential use in aerospace, smart coating transport phenomena and other industries.

Design and fabrication of electro‐conductive polymer nanocomposites with mechanical and thermal resistance

AbstractThe commencement of the industrial revolution paved the way for the fabrication of flexible polymers with high‐strength metalloceramics as novel materials of all kinds. Fabricating metal–ceramic/polymer conductive composites is one such dimension followed for the present research work making use of the properties of the three components. Electroless deposition, for permanent metallic coating, was performed to coat Al2O3 with metallic Cu followed by the inclusion of the Cu–Al2O3 filler into a poly(vinyl chloride) (PVC) matrix. X‐ray diffraction and energy‐dispersive X‐ray studies predicted a prominent growth of metallic Cu crystallites onto Al2O3 with an increased average size and variation in elemental composition, respectively, when compared to pristine Al2O3. Morphological behaviour via scanning electron microscopy also envisioned uniform Cu coating onto Al2O3 and a homogeneous dispersion throughout the polymer matrix. When incorporated into PVC, electrical conductivity analysis highlighted a distinct variation in composite phases from insulating (7.14 × 10−16 S cm−1) to semiconducting behaviour (8.33 × 10−5 S cm−1) as a function of Cu–Al2O3 filler. Mechanical behaviour (tensile strength, Young's modulus and elongation at break) and thermal properties of the prepared composites also indicated a substantial improvement in material strength with Cu–Al2O3 incorporation. The enhanced electrical conductivity along with improved thermomechanical status with significant filler–matrix interaction permits the potential usage of such novel composites in a range of state‐of‐the‐art semiconducting electronic devices. © 2018 Society of Chemical Industry

Numerical Simulation of Slip Influence on the Flow of a MHD Williamson Fluid Over a Vertical Convective Surface

Abstract An analysis of this paper is examined, two-dimensional, laminar with heat transfer on natural convective flow in an electro-conductive polymer on the external surface of a vertical plate under radial magnetic field and slip effects is considered. The coupled governing partial differential equations are transformed to ordinary differential equations by using non-similarity transformations. The obtained ordinary differential equations are solved numerically by a well-known method named as Keller Box Method (KBM). The computed results for the velocity and temperature profiles as well as heat transfer and skin-friction coefficient have been depicted and discussed in detail through graphs for various parametric conditions. Increasing thermal slip strongly decreases skin friction and Nusselt number. Skin friction is also depressed with increasing magnetic body force parameter. Increasing momentum slip is observed to decrease skin friction. The model is relevant to the simulation of magnetic polymer materials processing.

Modeling transient magnetohydrodynamic peristaltic pumping of electroconductive viscoelastic fluids through a deformable curved channel

A mathematical model is presented to analyze the unsteady peristaltic flow of magnetized viscoelastic fluids through a deformable curved channel. The study simulates the bio-inspired pumping of electroconductive rheological polymers which possess both electroconductive and viscoelastic properties. The Jeffrey viscoelastic model is utilized which features both relaxation and retardation terms of relevance to real polymers. A magnetic body force is incorporated for the influence of static radial magnetic field. The mass and momentum conservation equations are formulated in an intrinsic coordinate system and transformed with appropriate variables into a nondimensional system between the wave and the laboratory frames, under lubrication (i.e., low Reynolds number and long wavelength) approximations. Kinematic and no-slip boundary conditions are imposed at the channel walls. A magnetic body force is incorporated for the influence of static radial magnetic field in the primary momentum equation. An analytic approach is employed to determine closed-form solutions for stream function, axial pressure gradient, and volumetric flow rate. Spatiotemporal plots for pressure distribution along the channel (passage) length are presented to study the influences of curvature parameter, relaxation-to-retardation time ratio (Jeffrey first viscoelastic parameter) and Hartmann number (magnetic field parameter). The effects of these parameters on radial velocity distributions are also visualized. Cases of trapping and reflux in a curved channel are discussed. Streamline distributions are included to study trapping phenomena and to investigate more closely the impact of curvature, magnetic field, and viscoelastic properties on bolus evolution. The reflux or retrograde motion of the particles is studied by particle advection based on Lagrangian viewpoint. The simulations provide new insight into the mechanisms of pumping of electroconductive non-Newtonian liquids in realistic geometries.

Electrically Conductive Polymer Composite Dispensing Process for EMI Shielding Structure

Electro Magnetic Interference (EMI) shielding structure with low cost and high performance is proposed. Conductive polymer composite is formulated with metal based filler and silicone polymer and solvent. The liquid composite material can be easily dispensed through the low pressure injection nozzle and cured to the conformal structure with high aspect ratio. High electro conductive polymer composite dispensing process is developed to build a conformal structure for the EMI shielding of PBA(Printed Board Assembly). In order to increase electrical conductivity of composite material, Ag coated copper is adopted for conductive filler material and dendrite structure is applied to reduce content ratio of the conductive filler in the composite material. An EMI shielding structure is designed to cover the exposed surface of the chip package and modified for the shielding module containing chips and electrical elements on the PBA. The wall thickness of shielding layer is under 0.6mm and aspect ratio is lower than 2.0. The conformal structure is fabricated by dispensing process with side slot nozzle and viscoelastic behavior of composite material maintains the vertical thin wall structure. EMI shielding performance is verified by measurement of chip level EMI shielding test procedure developed in this study.

Selective adsorption of gold and silver in bromine solutions by acetate cellulose composite membranes coated with polyaniline or polypyrrole

This paper presents the selective adsorption of bromine-metallic complexes of Au and Ag on composite membranes, as well as the desorption process and redoping of the conducting polymers. The polyaniline (PANI) and polypyrrole (PPy) membranes exhibited relevant adsorption properties. 72% for gold and 98% for silver with PANI, 50% for gold and 97% for silver with PPy, in bromine complexes. The adsorption capabilities of the composite membranes were attributed to the ion exchange between the dopant and the AuBr 4 − or AgBr 2 − complexes. Both materials fitted to a Langmuir isotherm. PANI-based membranes reached 31.4% of gold and 54.4% of silver desorption whereas PPy-based membranes reached 54% of gold and 28.8% of silver. Redoping studies suggested the potential reuse of the PANI-based membranes at least for six cycles of the adsorption/desorption process. The preparation of cellulose acetate membranes modified with poly (acrylic acid) and triphenyl phosphate and coated with the conducting polymers, PANI or PPy was in accordance to our previously reported method. The composite membranes were characterized by FT-IR, scanning electron microscopy, electrical conductivity measurements, I–V, mechanical tests, contact angle measurements, XRD and energy disperse spectroscopy. The novelty of the present work is the combination of electroconductive polymers, for the recovery of metals, and bromide as a leachate, less harmful than the traditionally used leachers.

New Textile Sensors for In Situ Structural Health Monitoring of Textile Reinforced Thermoplastic Composites Based on the Conductive Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) Polymer Complex.

Many metallic structural and non-structural parts used in the transportation industry can be replaced by textile-reinforced composites. Composites made from a polymeric matrix and fibrous reinforcement have been increasingly studied during the last decade. On the other hand, the fast development of smart textile structures seems to be a very promising solution for in situ structural health monitoring of composite parts. In order to optimize composites’ quality and their lifetime all the production steps have to be monitored in real time. Textile sensors embedded in the composite reinforcement and having the same mechanical properties as the yarns used to make the reinforcement exhibit actuating and sensing capabilities. This paper presents a new generation of textile fibrous sensors based on the conductive polymer complex poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) developed by an original roll to roll coating method. Conductive coating for yarn treatment was defined according to the preliminary study of percolation threshold of this polymer complex. The percolation threshold determination was based on conductive dry films’ electrical properties analysis, in order to develop highly sensitive sensors. A novel laboratory equipment was designed and produced for yarn coating to ensure effective and equally distributed coating of electroconductive polymer without distortion of textile properties. The electromechanical properties of the textile fibrous sensors confirmed their suitability for in situ structural damages detection of textile reinforced thermoplastic composites in real time.

Numerical exploration of thermal radiation and Biot number effects on the flow of a non‐Newtonian MHD Williamson fluid over a vertical convective surface

AbstractA theoretical and computational study of the magnetohydrodynamic flow and free convection heat transfer in an electroconductive polymer on the external surface of a vertical plate under radial magnetic field is presented. The Biot number effects are considered at the vertical plate surface via modified boundary conditions. The Williamson viscoelastic model is employed which is representative of certain industrial polymers. The nondimensional, transformed boundary layer equations for momentum and energy are solved with the second‐order accurate implicit Keller box finite difference method under appropriate boundary conditions. Validation of the numerical solutions is achieved via benchmarking with earlier published results. The influence of Weissenberg number (ratio of the relaxation time of the fluid and time scale of the flow), magnetic body force parameter, stream‐wise variable, and Prandtl number on thermo fluid characteristics are studied graphically and via tables. A weak elevation in temperature accompanies increasing Weissenberg number, whereas a significant acceleration in the flow is computed near the vertical plate surface with increasing Weissenberg number. Nusselt number is reduced with increasing Weissenberg number. Skin friction and Nusselt number are both reduced with increasing magnetic field effect. The model is relevant to the simulation of magnetic polymer materials processing.

Electro-Conductive Membranes for Permeation Enhancement and Fouling Mitigation: A Short Review.

The research on electro-conductive membranes has expanded in recent years. These membranes have strong prospective as key components in next generation water treatment plants because they are engineered in order to enhance their performance in terms of separation, flux, fouling potential, and permselectivity. The present review summarizes recent developments in the preparation of electro-conductive membranes and the mechanisms of their response to external electric voltages in order to obtain an improvement in permeation and mitigation in the fouling growth. In particular, this paper deals with the properties of electro-conductive polymers and the preparation of electro-conductive polymer membranes with a focus on responsive membranes based on polyaniline, polypyrrole and carbon nanotubes. Then, some examples of electro-conductive membranes for permeation enhancement and fouling mitigation by electrostatic repulsion, hydrogen peroxide generation and electrochemical oxidation will be presented.

Electroconductive polymer-coated silk fiber electrodes for neural recording and stimulation in vivo

We fabricated a silk-based low-impedance flexible electrode by coating a silk thread with the electroconductive polymer poly(3,4-ethylenedioxythiophene) doped with p-toluenesulfonate (PEDOT:pTS). This electrode had a lower impedance (about 1.8 kΩ/cm) than the silk electrode coated with PEDOT doped with poly(styrene sulfonate) (PEDOT:PSS) (about 1.3 MΩ/cm) reported previously. Using this electrode, a novel gamma-band oscillatory activity was recorded in the electrocorticogram from the embryonic chick brain with a high signal-to-noise ratio. Electrical stimulation was also possible with the silk electrode. We also fabricated an all-silk electrode array and recorded synchronized gamma oscillations. These results demonstrate that the silk electrode can be used for electrophysiological recording and local stimulation in vivo. The silk electrode has the potential to be used for diagnostic and therapeutic purposes and as a brain–machine interface.

Hydromagnetic Flow and Heat Transfer in a Williamson Non-Newtonian Fluid from a Horizontal Circular Cylinder with Newtonian Heating

A theoretical and computational study of the magneto hydrodynamic flow and free convection heat transfer in an electro-conductive polymer on the external surface of a horizontal circular cylinder under radial magnetic field is presented. The Williamson viscoelastic model is employed which is representative of certain industrial polymers. Newtonian heating is incorporated via appropriate boundary conditions as this represents better actual thermal materials processing operations. The non-dimensional, transformed boundary layer equations for momentum and energy are solved with the second order accurate implicit Keller box finite difference method under appropriate boundary conditions. Validation of the numerical solutions is achieved via benchmarking with earlier published results. The influence of Weissenberg number (ratio of the relaxation time of the fluid and time scale of the flow), magnetic body force parameter, stream wise variable and Prandtl number on thermofluid characteristics are studied graphically and via tables. A weak elevation in temperature accompanies increasing Weissenberg number whereas a significant acceleration in the flow is computed near the cylinder surface with increasing Weissenberg number. Nusselt number is reduced with increasing Weissenberg number. Skin friction is increased whereas Nusselt number is reduced with greater stream wise coordinate. The study is relevant to smart coating transport phenomena.