Pure Polyethylene Oxide Research Articles

Application of Li6.4La3Zr1.45Ta0.5Mo0.05O12/PEO Composite Solid Electrolyte in High-Performance Lithium Batteries.

Replacing the flammable liquid electrolytes with solid ones has been considered to be the most effective way to improve the safety of the lithium batteries. However, the solid electrolytes often suffer from low ionic conductivity and poor rate capability due to their relatively stable molecular/atomic architectures. In this study, we report a composite solid electrolyte, in which polyethylene oxide (PEO) is the matrix and Li6.4La3Zr1.45Ta0.5Mo0.05O12 (LLZTMO) and Li6.4La3Zr1.4Ta0.6O12 (LLZTO) are the fillers. Ta/Mo co-doping can further promote the ion transport capacity in the electrolyte. The synthesized composite electrolytes exhibit high thermal stability (up to 413 °C) and good ionic conductivity (LLZTMO-PEO 2.00 × 10-4 S·cm-1, LLZTO-PEO 1.53 × 10-4 S·cm-1) at 35 °C. Compared with a pure PEO electrolyte, whose ionic conductivity is in the range of 10-7~10-6 S·cm-1, the ionic conductivity of composite solid electrolytes is greatly improved. The full cell assembled with LiFePO4 as the positive electrode exhibits excellent rate performance and good cycling stability, indicating that prepared solid electrolytes have great potential applications in lithium batteries.

Cationic cellulose nanofiber solid electrolytes: A pathway to high lithium-ion migration and polysulfide adsorption for lithium-sulfur batteries

Polyethylene oxide (PEO) solid electrolytes, acknowledged for their safety advantages over liquid counterparts, confront inherent challenges, including low ionic conductivity, restricted lithium ion migration, and mechanical fragility, notably pronounced in lithium‑sulfur batteries due to the polysulfide shuttling phenomenon. To address these limitations, we integrate a quaternary ammonium cation-modified cellulose (QACC) nanofiber, electrospun with cellulose acetate (CA) from recycled cigarette filters, into the PEO electrolyte matrix. The nitrogen atom within the quaternary ammonium group exhibits a pronounced affinity for polysulfide compounds, effectively curtailing polysulfide migration. Concurrently, Lewis acid-base interactions between quaternary ammonium groups and lithium salt anions facilitate the release of additional Li+, achieving a lithium-ion transference number 1.5 times higher than its pure PEO counterpart. Furthermore, the introduction of a larger trifluoromethanesulfonimide (TFSI) group on the QACC macromolecule (TFSI-QACC) disrupts the ordered arrangement of PEO macromolecules, resulting in a noteworthy enhancement in ionic conductivity, reaching 2.07 × 10−4 S cm−1 at 60 °C, thus addressing the challenge of low PEO electrolyte conductivity. Moreover, the nanofiber enhances the mechanical strength of the PEO electrolyte from 0.49 to 7.50 MPa, mitigating safety concerns related to lithium dendrites puncturing the electrolyte. Consequently, the composite PEO demonstrates exemplary performance in lithium symmetrical batteries, enduring 500 h of continuous operation and completing 100 cycles at both room and elevated temperatures. This integrated approach, transitioning from waste to wealth, adeptly addresses a spectrum of challenges in the efficiency of solid-state electrolytes, holding considerable promise for advancing lithium‑sulfur battery technology.

Functionalized Thiophosphate and Oxidic Filler Particles for Hybrid Solid Electrolytes

AbstractTo achieve the commercialization of solid‐state‐batteries (SSBs), solid electrolyte properties need to be further improved. The hybrid solid electrolyte (HSE) approach is expected to combine the favorable properties of different solid electrolyte classes and is therefore systematically investigated. Mixing low amounts of thiophosphate or oxide filler particles (FP) into a polyethylene oxide (PEO) polyethylene glycol (PEG) and lithium salt bis(trifluoromethane)sulfonimide (LiTFSI) matrix cannot improve the electrochemical properties. Silanization of the thiophosphate FPs significantly increases the ionic conductivity to 0.1 mS cm−1 at room temperature compared to 0.017 mS cm−1 for a pure PEO solid electrolyte. Moreover, a correlation between the intrinsic conductivity of the FPs and the resulting conductivity of the HSE is observed. Also, the functionalization is successfully transferred to oxide FPs. In addition to an equally significant increase in ionic conductivity, a strong influence of the crystallite size of the FPs on the resulting ionic conductivity of the HSE was found. The discovered effect of FP surface structure on overall HSE conductivity indicates a participation of the FP surface in ion transport and emphasizes the need for tailored filler design in HSE applications.

Defect-free PEO membrane fabrication by hydrogen bonding coupling thermal annealing for carbon capture

Reduction of CO2 emission is an urgent global demand to deal with the current extreme climate and ecosystem destruction. Polyethylene oxide (PEO) is an ideal material for CO2 separation membranes, because of its moderate affinity for CO2. However, due to its high tendency of crystallization, the mass transfer of CO2 is significantly hampered, resulting in poor separation performance. This study proposed of employment of trehalose as the filler to PEO membrane with subsequent thermal annealing, that is hydrogen-bond suppression crystallization coupling thermal annealing healing defects strategy, to simultaneously enhance the gas transport and selectivity. The trehalose plays the role of suppressing PEO crystallization while thermal annealing charges for healing defects. Consequently, the optimized trehalose-loaded PEO membrane exhibits a CO2 permeability of 117 Barrer and an ideal CO2/N2 selectivity of 51, which is superior to the pure PEO membrane. Moreover, the membrane offers merits of anti-plasticization feature and long-term running stability.

Coarse-Grained Force Field for Polyethylene Oxide and Polyethylene Glycol Aqueous Solutions Based on a Polarizable Water Model

A new, accurate and transferable coarse-grained (CG) force field (FF) for polyethylene oxide (PEO) and polyethylene glycol (PEG) aqueous solutions based on a polarizable CG water (PCGW) model is developed in this work. A PCGW bead, which represents four water molecules, is modeled as two charged dummy particles connected by two constrained bonds to a central neutral particle; a PEO or PEG oligomer is modeled as a chain with repeated middle beads (PEOM) representing diether groups and two terminal beads (PEOT or PEGT) of a different type compared to PEOM. To describe nonbonded van der Waals interactions, a piecewise Morse potential with four tunable parameters is used. The force parameters are automatically and rigorously optimized by a meta-multilinear interpolation parameterization (meta-MIP) algorithm to simultaneously match multiple thermodynamic properties, including the density, heat of vaporization, vapor-liquid interfacial tension, and solvation free energy of the pure PEO or PEG oligomer bulk system as well as the mixing density and hydration free energy of the oligomer/water binary mixture. Additional thermodynamic and structural properties for longer PEO and PEG polymer aqueous solutions, such as the self-diffusion coefficient, radius of gyration, and end-to-end distance, are predicted to test the accuracy and transferability of this new CG FF. Based on the PCGW model, the presented FF optimization algorithm and strategy can be extended to more complex polyelectrolytes and surfactants.

The selective heating effect of microwave irradiation on a binary mixture of water and polyethylene oxide: a molecular dynamics simulation approach.

In this study, we investigate the molecular mechanisms of a microwave-driven selective heating process by performing molecular dynamics simulations for three different systems including pure water, pure polyethylene oxide (PEO), and water-PEO mixed systems in the presence of a microwave with two different intensities of electric field such as 0.001 V Å-1 and 0.01 V Å-1 at a frequency of 100 GHz. First, from performing molecular dynamics simulations of CO and CO2 in the presence of the microwave, it is confirmed that the molecular dipole moment is responsible for the rotational motion induced by the oscillating electric field. Second, by analyzing the MD simulations of the pure water system, we discover that the dipole moment of water exhibits a time lag with respect to the microwave. During the heating process, however, the temperature, kinetic, and potential energies increase synchronously with the oscillating electric field of the microwave, showing that the heating of the water system is caused by the molecular reaction of water to the microwave. Comparing the water-PEO mixed system to the pure water and pure PEO systems, the water-PEO mixed system has a higher heating rate than the pure PEO system but a lower heating rate than the pure water system. Therefore, we conclude that heating the water-PEO mixed system is driven by water molecules selectively activated by microwave irradiation. We also calculate the diffusion coefficients of water molecules and PEO chains by describing their mean square displacements, demonstrating that the diffusion coefficients are increased in the presence of microwaves for both water and PEO in pure and mixed systems. Lastly, during the microwave heating process, the structures of the water-PEO mixed system are altered as a function of the intensity of electric field, which is mainly driven by the response of water molecules.

THE ACTIVATION ENERGY OF PURE POLYETHYLENE OXIDE AND POLYETHYLENE OXIDE DISPERSED WITH IODINE

The activation energy of thin films polymers made of pure polyethylene oxide (PEO) andPEOdoped with 0.1 % by weight iodine were investigated. The observed physical constants of the cast thin films, such as the activation energy were determined. The films were prepared by the casting method using electricity. This study investigated the variation of the activation energy of thin films of pure (PEO) andPEOdoped with 0.1 % wt. iodine with a frequency in the range of 200-800 kHz and with the temperature in the range of 30-55°C. The results proved that there is a significant change in the values of the activation energy (Ea) of both thin films being studied with the variation of frequency and temperature. It was found that the values of the (Ea) of the prepared thin films decrease withPEOdoped with 0.1 % wt. iodine. The Ea values for both thin films studied decrease with the increase in frequency and temperature.

THE EFFECT OF ADDITION 0.1% IODINE BY WEIGHT ON THE THERMAL PROPERTIES OF POLYETHYLENE OXIDE FILMS

This paper aimed to investigate the thermal properties of thin films of polyethylene oxide (PEO) dispersed with a fixed amount of 0.1 wt.% iodine dopants. The thermal conductivity and resistivity of pure thin PEO films and the prepared ones doped with 0.1 wt.% iodine composites have been studied at different temperatures. The thermal conductivity of these films increases with the increase in temperature and with the ones doped with 0.1 wt.% iodine.

THE EFFECT OF 0.1 WT% IODINE ADDITION ON THE OPTICAL PROPERTIES OF POLYETHYLENE OXIDE FILMS

The study aimed to investigate the optical properties of thin films made of polyethylene oxide dispersed with dopants of a fixed amount of iodine (0.1 wt %). The films prepared by the casting method were optically investigated as a function of the iodine fillers. The study used a UV-visible spectrophotometer technique with a wavelength ranging from (200 to 800) nm and determined the absorption coefficient, refractive index, energy gap, extinction coefficient, optical conductivity, and dielectric constant in the UV-visible wavelength range. The results showed a noticeable change in these optical values with polyethylene oxide doped with 0.1 wt% iodine composites compared with the pure polyethylene oxide films. These measured values of polyethylene oxide doped with 0.1 wt% iodine depend on the wavelength of the incident ultraviolet light.

High-Performance PEO-Based All-Solid-State Battery Achieved by Li-Conducting High Entropy Oxides

A rock-salt-structured Li-conducting high entropy oxide was prepared and utilized as an active filler in a polyethylene oxide (PEO)-based solid-state composite electrolyte. X-ray diffraction and high-resolution transmission electron microscopy were adopted to analyze the crystal structure of the high entropy oxide containing 20% of Li ions (HL20). The HL20 was crystallized in the Fm3̅m space group with Li+ ions located at the center of the MO6 octahedra. The ionic conductivity of the composite membrane at 30 °C reaches 3.44 × 10-5 S cm-1. The inflection point of activation energy of the membrane with HL20 decreases by 5 °C compared with that of the pure PEO membrane. In the galvanostatic plating/stripping test, the Li||Li symmetric batteries could be cycled at a current density of 200 μA cm-2 for over 1200 h with an overpotential of 140 mV. The Li||LiFePO4 full battery could be charged/discharged at 0.5 C for 100 circles with a high capacity retention rate of 91%. Excellent rate performance is also achieved at lower temperatures and higher rates, showing the superiority of HL20 as an active filler. This work sheds light on the development of high entropy oxide as a new type of fast ionic conductor, promoting the practical application of all-solid-state batteries at a lower temperature.

Vanadium doped ceramic matrix Li6.7La3Zr1.7V0.3O12 enabled PEO-based solid composite electrolyte with high lithium ion transference number and cycling stability

Solid polymer electrolytes (SPEs) have attracted much attention because of their potential in improving energy density and safety. Vanadium doped ceramic matrix Li6.7La3Zr1.7V0.3O12 (LLZVO) was synthesized by high-temperature annealing, and formed a composite electrolyte with polyethylene oxide (PEO). Compared with pure PEO electrolyte membrane, the composite electrolyte membrane exhibited better ionic conductivity (30 °C: 3.2 × 10−5 S cm−1; 80 °C: 3.6 × 10−3 S cm−1). The combination of LLZVO was beneficial to improve the lithium ion transference number (tLi+) of SPE, which was as high as 0.81. The Li/SPE/LiFePO4 battery shows good cycling ability, with a specific capacity of 142 mAh g−1 after a stable cycle of 150 cycles. Meanwhile, the symmetrical lithium battery with composite electrolyte can work continuously for 1200 h without short circuit at the current density of 0.1 mA cm−2 at 50 °C, and the capacity is 0.176 mAh. Vanadium doped ceramic matrix LLZVO as an active ionic conductor, improved the overall performance of solid electrolyte.

Correlation of electrical, thermal, and crystal parameters of complex composite films based on polyethylene oxide (PEO) doped by copper sulfate (CuSO4)

Ionic conductivity and the conductivity mapping of PEO/CuSO4 complex composite films are investigated to show the effect of the complexation of the Cu+2 and SO4−2 ions on the PEO matrix. Adding CuSO4 into the PEO matrix decreases the crystallinity degree of PEO films and consequently enhances the ionic conductivity and charge diffusion due to increasing the segmental motion of PEO. The FTIR spectra demonstrate the complexation of the Cu+2 ions to the ether oxygen in PEO films, while the SO4−2 ions behave as free ions in the polymer matrix as elucidated in the vibrational modes of PEO/CuSO4 thin films. Introducing CuSO4 into the PEO matrix improves the thermal stability of the complex composite films. Moreover, the conductivity of the pure PEO film is 1.67 × 10−4 S/cm at room temperature. Increasing CuSO4 concentration in the PEO films to 20% increases the ionic conductivity up to 6.13 × 10−4 S/cm.

Laser beam power attenuation characteristics for pure polyethylene oxide polymer with different thickness

This paper reports experimental investigations of the effects of various parameters on visible laser beam attenuation characteristics for organic pure polyethylene oxide (PEO) thin films. The pure PEO thin films with various thicknesses were prepared using the solution casting method. The attenuation characteristics of the prepared pure PEO were investigated using diode pumped solid state (DPSS) laser (with wavelength 532 nm), and He–Ne laser (with wavelength 632.8 nm). For both laser systems the influences of different control parameters (including linear, circular polarization states of the laser output, the separation distance between the thin films and the optical detector, and the laser beam incidence angle on thin films) on laser beam power attenuation were obtained. The DPSS laser beam output power with linear polarization has greater attenuation characteristics than other control parameters used in this work.

Low cost novel PEO based nano-composite for semiconductor and He–Ne lasers beam attenuation: Structural and optical properties

This paper reports the synthesis of low cost polyethylene oxide (PEO) based polymer nanocomposites (PNCs) for laser beam attenuation. The experimental investigations revealed the novel optical properties and bandgap reduction of PEO upon insertion of the Pb3O4 nanofiller. The changes in structural and optical properties of the prepared PNCs were explored using the X-ray diffraction (XRD) method and the ultraviolet–visible (UV–Vis). A broad shift of absorption is evidenced upon the addition of Pb3O4 nanofiller. The optical parameter, including absorption coefficient (α), linear refractive index (n), and dielectric loss (εi), were calculated. The optical band gap reduced significantly from 5.4 eV (neat PEO) to 1.8 eV for PEO doped with 9% Pb3O4. The direct and indirect electronic transitions in pure PEO and PEO: Pb3O4 PNCs were determined based on Tauc's model. The type of electron transition is specified with the assistance of εi spectra. The nonlinear optical parameter, including first-order susceptibility (χ1), third-order susceptibility (χ³), and nonlinear refractive index (n2), were studied. In addition, Laser beam attenuation characteristics for prepared PNCs samples were investigated using both semiconductor laser and He–Ne laser. The PEO: Pb3O4 PNCs significantly attenuated the laser power for both laser systems.

Polymer nanofibers framework composite solid electrolyte with lithium dendrite suppression for long life all-solid-state lithium metal battery

The widespread deployment of lithium metal battery is limited by inhomogeneous electrodeposition of lithium metal (the growth of lithium dendrite), leading to pulverization, “dead” lithium and the unrestricted volume expansion of lithium metal anode. Owing to the high elastic modulus, thermal stability and electrochemical stability of polyimide, we design a novel composite solid polymer electrolyte blending with polyimide fibers framework paper. Polyimide fibers scaffold improves elastic modulus and tensile strength of composite electrolyte film. Effective ion transport network layers in electrolyte system are formed by adding polyimide fibers due to strong interaction between electron-withdrawing atoms and groups in the lithium salt for accelerating the dissociation of the lithium salt. Thus, polyimide composite electrolyte shows higher Li+ transfer number (∼2 times) than pure polyethylene oxide electrolyte, which is beneficial to regulate Li deposition for lithium dendrites inhibition. The electrochemical window of polyimide composite electrolyte is widened to 4.87 V after introducing stable physicochemical fibers framework, leading to high compatibility and stability with lithium metal anode. Therefore, the Li symmetrical battery with polyimide fibers framework composite electrolyte delivers low overpotential and long cycling life at different current densities. And the all-solid-state Li/LiFePO4 battery using this composite electrolyte reveals long cycling life (418 cycles), high Coulomb efficiency (99.97%), high capacity retention of 89.5% at 0.3 C, and good rate performance at 60 °C.

High ionic conductivity PEO-based electrolyte with 3D framework for Dendrite-free solid-state lithium metal batteries at ambient temperature

• A novel solid-state electrolyte with 3D framework has been designed and prepared. • The ionic conductivity of the fabricated electrolyte was 1.36 mS cm −1 at 30 °C. • LFP/Li and NCM622/Li cells delivered excellent cyclic performances at 30 °C. • A stable solid electrolyte interphase was formed on Li anode surface upon cycling. Solid-state lithium metal batteries are one of the best candidates for the next generation of energy storage devices. However, their applications are greatly limited by low ionic conductivity at ambient temperature and poor interfacial compatibility of solid-state electrolytes. Herein, a novel composite solid-state electrolyte consisted of polyethylene oxide (PEO), aramid nanofibers (ANFs) and Li 7 La 3 Zr 2 O 12 (LLZO) was designed and prepared. The ANFs and PEO constructed a three-dimensional flexible framework by electrostatic attraction, and LLZO particles as Li + -conducting fillers were introduced into the polymer backbone. As a result, compared to the pure PEO host, the crystallinity of prepared electrolyte was remarkably decreased, and the ionic conductivity was increased to 1.36 mS cm −1 at 30 °C. LiFePO 4 /Li cells with the electrolyte delivered a high specific capacity of 152 mAh g −1 and the capacity retention was over 88 % after 400 cycles, and the LiNi 0.6 Co 0.2 Mn 0.2 O 2 /Li cell can stably operate 200 cycles at 0.5C under 30 °C. During cycling, a stable solid electrolyte interphase (SEI) was formed on the surface of lithium anode, inhibiting the formation of lithium dendrite and dead lithium, and improving the cyclic stability of the battery. Furthermore, the electrolyte exhibited satisfactory mechanical properties, high thermal stability, and good interfacial compatibility and stability with the lithium metal anode. This work could provide a reference for the development and practical application of solid-state lithium metal batteries at ambient temperature.

Effects of crosslinking on the physical solid-state and dissolution properties of 3D-printed theophylline tablets

Crosslinking is an established treatment to alter the physicochemical and functional properties of polymers through the creation of bonds between the polymer chains. Polymers can be crosslinked via radiation in the presence of photo-initiator. The aim of the present study was to formulate 3D-printed theophylline (THEO) tablets using polyethylene oxide (PEO) as a carrier polymer, and to study the influence of crosslinking on the drug release behavior. The tablets were 3D-printed using the aqueous solution of PEO and THEO (80:20 w/w) with a micro-extrusion-based printing setup. A photo-initiator (4-hydroxybenzophenone) was added into the printing solutions, and the injectability of the solutions was investigated prior to printing. The 3D-printed tablets were crosslinked after printing using ultraviolet (UV) or gamma-radiation, and crosslinking was verified by means of Fourier-transform infrared (FTIR) spectroscopy. The maximum injection force of aqueous printing solutions of PEO and THEO was close to that observed with the pure PEO solution. Increasing the number of printing layers in the 3D-printed tablets resulted in a slower drug release in vitro. Gamma-radiation in a nitrogen environment and UV-crosslinking made the carrier polymer (PEO) less water-soluble, but such crosslinking did not affect the release rate of the tablets. Surprisingly, even faster drug release behavior was found with the crosslinked 3D-printed tablets compared to that of non-crosslinked tablets. More research work is needed on the impact of 3D-printed tablet layering thickness and crosslinking for tailoring drug release behavior.

Ultraviolet-cured polyethylene oxide-based composite electrolyte enabling stable cycling of lithium battery at low temperature

The room and low-temperature performances of solid-state lithium batteries are crucial to expand their practical application. Polyethylene oxide (PEO) has received great attention as the most representative polymer electrolyte matrix. However, most PEO-based solid-state batteries need to operate at high temperature due to low room temperature ionic conductivity. Improving the ionic conductivity by adding plasticizers or reducing the crystallinity of PEO often compromises its mechanical strength. Here, an amorphous PEO-based composite solid-state electrolyte is obtained by ultraviolet (UV) polymerizing PEO and methacryloyloxypropyltrimethoxy silane (KH570)-modified SiO2 which demonstrates both satisfactory mechanical performance and high ionic conductivity at room (3.37 × 10−4 S cm−1) and low temperatures (1.73 × 10−4 S cm−1 at 0 °C). In this electrolyte, the crystallinity of PEO is reduced through cross-linking, and therefore provides a fast Li+ ions transfer area. Moreover, the KH570-modified SiO2 inorganic particles promote the dissociation of lithium salts by Lewis acid centers to increase the ionic conductivity. Importantly, this kind of cross-linking networks endows the final electrolyte much higher mechanical strength than the pure PEO polymer electrolyte or PEO-inorganic filler blended systems. The solid-state LiFePO4/Li cell assembled with this electrolyte exhibits excellent cycling performance and high capacity at room and low temperatures.

Electrospinning of Chitosan Biopolymer and Polyethylene Oxide Blends

Abstract The objective of this study is to investigate the morphological (scanning electron microscopicy images), thermal (differential scanning calorimetry), and electrical (conductivity) properties and to carry out compositional analysis (Fourier-transform infrared) of produced nonwoven fibrous materials adapted in biomedical applications as scaffolds. The orientation of produced nanofilaments was also investigated because it is considered as one of the essential features of a perfect tissue scaffold. Viscosity and electrical conductivity of solutions, used in the manufacturing process, were also disassembled because these properties highly influence the morphological properties of produced nanofibers. The nanofibrous scaffolds were fabricated via conventional electrospinning technique from biopolymer, synthetic polymer, and their blends. The chitosan (CS) was chosen as biopolymer and polyethylene oxide (PEO) of low molecular weight as synthetic polymer. Solutions from pure CS were unspinnable: beads instead of nanofibers were formed via spinning. The fabrication of pure PEO nanomats from solutions of 10 wt%, 15 wt%, and 20 wt% concentrations (in distilled water) turned out to be successful. The blending of composed CS solutions with PEO ones in ratios of 1:1 optimized the parameters of electrospinning process and provided the opportunity to fabricate CS/PEO blends nanofibers. The concentration of acetic acid (AA) used to dissolve CS finely spuninned the nanofibers from blended solutions and influenced the rate of crystallization of manufactured fiber mats. The concentration of PEO in solutions as well as viscosity of solutions also influenced the diameter and orientation of formed nanofibers. The beadless, highly oriented, and defect-free nanofibers from CS/PEO solutions with the highest concentration of PEO were successfully electrospinned. By varying the concentrations of AA and low molecular weight PEO, it is possible to fabricate beadless and highly oriented nanofiber scaffolds, which freely can found a place in medical applications.

Preparation and characterization of functionalized multiwalled carbon nanotubes filled polyethylene oxide nanocomposites

The functionalized multi-walled carbon nanotubes (F-MWCNTs) filled polyethylene oxide (PEO) nanocomposites were prepared by casting technique and characterized by scanning electron microscopy (SEM), polarized optical microscopy (POM), thermal gravimetric analysis (TGA) and differential thermal analysis (DTA). The MWCNTs were functionalized by Friedel–Crafts acylation, which introduced aromatic amine groups on the side wall of nanotubes. The SEM micrograph of F-MWCNTs/PEO nanocomposites fractured surfaces indicated that the F-MWCNTs were well dispersed within the PEO matrix. The POM study presented that the neat PEO upon crystallization showed considerable size of crystalline spherulites. The sizes of spherulites decreased with incorporation of F-MWCNTs into the polymer matrix, which might be due to the nucleation role of F-MWCNTs in F-MWCNTs/PEO composite. The DSC analysis showed that the Tm of pure PEO was about 66 °C, which slightly decreased by the incorporation of F-MWCNTs into the polymer matrix. The Tm of 1, 3 and 5 wt% F-MWCNTs/PEO nanocomposites was 65.6, 64 and 63.8 °C, respectively. It was also observed that the thermal stabilities of pure PEO were shifted towards higher temperature when F-MWCNTs were incorporated into the polymer matrix. The TGA analysis represents that pure PEO and 1 wt% of F-MWCNTs/PEO nanocomposite decomposed completely at about 460 °C while thermal stability of 3 and 5 wt% of F-MWCNTs/PEO nanocomposites were shifted towards higher temperature.