Good Dispersion Of Multi-walled Carbon Nanotubes Research Articles

Study of the thermomechanical behavior of composite based on Elium acrylic resin, carbon nanotubes, and flax fibers: Experimental approach

AbstractThis study evaluated the effect of multi‐walled carbon nanotubes (MWCNT) addition on the thermomechanical, and electrical responses of unidirectional flax fibers/Elium acrylic modified carbon nanotubes‐based composite. The manufacturing process of these laminated composites involved infusing the nanofillers onto the fibers, ensuring good dispersion of MWCNT within the matrix. Regardless of the rate of incorporated nanotubes, this study revealed a significant deterioration of the mechanical properties in tension and viscoelastic properties of the Elium acrylic resin‐based nanocomposite. The electrical conductivity significantly increased for all nanocomposites and laminated composites. In contrast to the nanocomposite, the unidirectional flax fibers/MWCNT/Elium acrylic composite exhibited a considerable improvement in mechanical properties. An increase in Young's modulus and stress at break of about 27% and 23% respectively, was achieved for the material loaded with 2 wt% of MWCNT. The presence of MWCNT reduces the saturation weight by 5% for the unidirectional composite filled with an amount of 1.5 wt% in MWCNT.Highlights Improving the electrical properties of nanocomposites and unidirectional fibers (UD) composites. Improving the mechanical properties of Elium/flax/multi‐walled carbon nanotubes (MWCNT) composites. Influence of MWCNTs on the water absorption of UD composites. Influence of MWCNT on the glass transition temperature of nanocomposites. Inhibiting polymerization of MWCNT with Elium.

The enhanced tribological performance of fabric‐reinforced resin composites by biomimetic surface modification of fillers

The poor dispersion of multiwalled carbon nanotubes (MWCNTs) and weak interfacial adhesion of fabric and resin matrix seriously affect the tribological performance of fabric‐reinforcement resin composites. Tannic acid (TA), a plant‐derived compound, which is similar to mussel‐inspired polydopamine, can adhere to various substrates under a weak basic buffer solution. Therefore, in this work, TA‐modified MWCNTs were incorporated into TA functionalized fabric composite to improve the tribological performance of the fabric composite. The results indicate that the MWCNTs and fabric were successfully modified with TA. The wear tests revealed that the TA‐MWCNTs reinforcement TA‐fabric resin composites exhibited the best tribological performance, in which the friction coefficient and volume wear rate decreased by 16.9% and 40%, respectively, compared with pristine fabric composite. The favorable interfacial bonding between fabric and resin is beneficial to the friction force transfer to the load‐bearing fabric, decreasing the stress focus and thus reducing the damage to composite materials. Meanwhile, the good dispersion of MWCNTs contributes to the excellent lubrication performance. This simple and eco‐friendly method of treating fillers with TA provides a new approach to achieve high‐performance tribological materials.

Fabrication of CNTs-reinforced poly(vinyl alcohol) nanocomposite film with tailored structural, surface chemical and optical properties

Purpose This study aims to fabricate multiwalled carbon nanotubes (MWCNTs)-mediated polyvinyl alcohol (PVA) composite films using the solution casting approach. Design/methodology/approach The prepared films were evaluated for diverse structural, surface, optical and electrical attributes using advanced analytical techniques, i.e. electron microscopy for surface morphology, Fourier transform infrared spectroscopy for tracing chemical functionalities, x-ray diffraction (XRD) for crystal patterns, water contact angle (WCA) analysis for surface wettability and UV visible spectroscopy for optical absorption parameters. The specimens were also investigated for certain rheological, mechanical and electrical properties, where applicable. Findings The surface morphology results expressed a better dispersion of MWCNTs in the resultant PVA-based nanocomposite film. The XRD analysis exhibited that the nanocomposite film was crystalline. The surface wettability analysis indicated that with the inclusion of MWCNTs, the WCA of the resultant nanocomposite film improved to 89.4° from 44° with the pristine PVA film. The MWCNTs (1.00%, w/w) incorporated PVA-based film exhibited a tensile strength of 54.0 MPa as compared to that of native PVA as 25.3 MPa film. There observed a decreased bandgap (from 5.25 to 5.14 eV) on incorporating the MWCNTs in the PVA-based nanocomposite film. Practical implications The MWCNTs’ inclusion in the PVA matrix could enhance the AC conductivity of the resultant nanocomposite film. The prepared nanocomposite film might be useful in designing certain optoelectronic devices. Originality/value The results demonstrated the successful MWCNTs mediation in the PVA-based composite films expressed good intercalation of the precursors; this resulted in decreased bandgap, usually, desirable for optoelectronic applications.

High‐speed shear dispersion of MWCNTs assisted by PVP in water and its effective combination with wet‐mixing technology for NR/MWCNTs nanocomposites

AbstractDue to their advantages of low lost, low filling, high‐performance and multifunction, multi‐walled carbon nanotubes (MWCNTs) are ideal filler for preparing high‐performance and multifunctional rubber‐based nanocomposites. However, the poor dispersion of MWCNTs in rubber matrix and their weak interfacial adhesion with rubber matrix limit their industrial applications seriously. Herein, natural rubber (NR)/MWCNTs nanocomposites (NMNCs) with good static and dynamic mechanical properties, electrical and thermal conductivity have been successfully prepared via high‐speed shear dispersion of MWCNTs assisted by polyvinylpyrrolidone in water and its effective combination with rubber wet‐mixing technology, on the basis of the systematic optimization of the most common dispersants and exfoliation methods of carbon nanotubes (CNTs). Compared with NMNCs prepared by traditional dry‐mixing technology (D‐NMNCs), NMNCs prepared by wet‐mixing technology (W‐NMNCs) in this work exhibit better tensile properties, lower compression temperature rise and DIN abrasion, higher electrical and thermal conductivity, better ice and wet‐slip resistance (i.e., the higher loss tangents at −20 and 0°C, respectively), and lower rolling resistance (i.e., the lower loss tangent at 60°C), benefiting from the better dispersion of MWCNTs and the stronger interface interaction of NR‐MWCNTs in W‐NMNCs. In a word, the preparation route of W‐NMNCs developed in this work is very suitable for industrialization and conductive to breaking the insurmountable “Devil's Triangle” problem in tire industry, and W‐NMNCs have potential high‐technology applications in green, antistatic, and heat‐dissipation tires, antistatic conveyors, vibration absorption, and so forth.

Powder metallurgy and hardness of the Ll-10Mg alloy reinforced with carbon nanotubes

In this work, the multi-walled carbon nanotubes (MWCNTs) were purified with an acid treatment and subsequently dispersed using ultrasound and a nonionic surfactant solution of ethoxylated lauric alcohol 7 moles of ethylene oxide (E7E). Then, carbon nanotubes (CNTs) were used as a reinforcement phase (0.4 wt.% and 0.8 wt.%) in the Al- 10Mg alloy. The high-energy ball milling was employed for the nanocomposites processing, and the resulting powders consolidate by uniaxial pressure. Measurements of Vickers microhardness, nanohardness, displacement, and Young's modulus were carried out on the compacts. The samples were analyzed using scanning electron microscopy (SEM), X-ray diffraction (XRD), ultraviolet-visible spectroscopy (UV-Vis), Fourier-transform infrared spectroscopy (FT-IR), and Raman spectroscopy (RS). Good dispersion of MWCNTs was achieved using 0.5 mg/ml of the E7E surfactant. The CNTs were dispersed in the Al-10Mg matrix using 0.25 h of milling. After powders compaction, the Al-10Mg/0.4MWCNTs nanocomposite presented a microhardness of 190 HV, nanohardness of 3.5 GPa, and Young's modulus 116 GPa.

Well‐dispersed poly(ether‐ether‐ketone)/multi‐walled carbon nanotube nanocomposites prepared via a simple solution mixing approach

AbstractIncorporation of reinforcing nanoparticles, like multi‐walled carbon nanotubes (MWCNTs), in a polymer matrix is an effective way to enhance mechanical properties and expand structural applications of engineering polymers such as poly(ether‐ether‐ketone) (PEEK). Good dispersion of MWCNTs is critical for achieving optimal properties. In this work, a simple solution mixing approach was utilized to prepare PEEK nanocomposites reinforced with MWCNTs. By direct mixing of PEEK/dichloroacetic acid solution and MWCNT/N‐methyl‐2‐pyrrolidone solution, PEEK nanocomposites with individually dispersed MWCNTs were prepared. A PEEK wrapping of MWCNT mechanism is proposed to explain why this simple solution mixing approach resulted in such a good dispersion. Thermal stability of PEEK is not affected but crystallization is impeded due to the confinement effect of well‐dispersed MWCNTs. Young's modulus is increased by ca 20% while coefficient of thermal expansion above the glass transition temperature is decreased by ca 30% with only 1.5 wt% MWCNT loading in PEEK, which is critical for a variety of high‐temperature applications. © 2021 Society of Industrial Chemistry.

Mechanical and flame retardant enhancement of EVA/MWCNTs neutron shielding composites irradiated with high-energy electron beam

Using a melt-mixing technique, ethylene–vinyl acetate (EVA) copolymers based composites containing Multi-Wall Carbon nanotubes (MWCNTs), aluminum trihydrate (ATH), zinc borate (ZB), and gadolinium oxide (Gd2O3) were fabricated. Then, the as-prepared samples were irradiated with an electron beam (EB) at the dose range varied from 0 to 275 kGy. Moreover, we investigated the properties of irradiated and unirradiated samples. Morphological observation showed good dispersion of MWCNTs and other additives in EVA. Furthermore, the gel content, mechanical properties, the limit oxygen index (LOI) values of irradiated composites increased to 28.4% after 250 kGy after irradiated. All the conclusions indicated that the comprehensive properties of the WMCNTs/EVA composites were improved by using high energy electron beam irradiation.

Electrical, mechanical, and electromagnetic interference shielding properties of poly(ether-ketone)-MWCNT nanocomposites

In this work, the effect of untreated multi-walled carbon nanotubes (MWCNT) on electrical properties, microhardness, and the electromagnetic interference shielding effectiveness (EMI-SE) of poly(ether-ketone) (PEK)-based nanocomposites were investigated. The MWCNT was varied from 0 to 8 wt% using planetary ball milling followed by hot pressing. The field emission scanning electron microscopy revealed good dispersion of MWCNTs in the PEK matrix and interface between the MWCNT and the PEK matrix is also good. The DC electrical conductivities and the dielectric constants of the PEK nanocomposites were increased approximately fourteen- and three orders of magnitude, respectively, compared to neat PEK. The Vickers microhardness of the nanocomposites increased ~ 46% compared to neat PEK. The EMI-SE of the nanocomposites was investigated using a vector network analyzer in both X-band (8.2–12.4 GHz) and Ku-band (12.4–18 GHz). A remarkable improvement in the electrical conductivity and the dielectric constant was obtained, which resulted in EMI-SE of ~ > 52 dB in both bands.

High dielectric constant epoxy nanocomposites based on metal organic frameworks decorated multi-walled carbon nanotubes

The interfacial region between nanofillers and polymer matrix plays a crucial role in determining the dielectric and mechanical properties of dielectric nanocomposites. A new strategy using metal–organic-framework (MOF) as a modifier to decorate multi-walled carbon nanotubes (MWCNTs) to achieve high-k polymer nanocomposites is introduced. The MOF-decorated MWCNTs serve both as a curing agent and as a nano-filler to enhance dielectric, thermal and mechanical properties of epoxy. The organic component in the MOF can trigger the crosslinking of epoxy resins, leading to good dispersion of MWCNTs and strong covalent bonding between MWCNT-MOF and the epoxy matrix. It is found that covalent bonding between MOF–epoxy significantly reduces both dielectric loss and coefficient of thermal expansion (CTE), while increasing the elastic modulus of epoxy. Two types of MWCNT-MOF hybrids with distinctly different morphologies were prepared to determine their influences on dielectric and mechanical properties. The usefulness of the present approach for the preparation of multi-functional polymer nanocomposites is discussed.

Investigation on Tribological and Machining Characteristics of Al 7075/MWCNTs Nanocomposites

In the present research work, an attempt has been made to fabricate the aluminum metal matrix composite by stir casting method. Aluminum 7075 alloy is used as a matrix which is reinforced with multi-walled carbon nanotubes (MWCNTs) with varying 4 wt% fabricated through liquid-state method (stir casting). The machining was performed using EDM. Experiments were carried out to analyze microstructure, mechanical, tribological, and machining characteristics such as microhardness, tensile strength, wear rate, coefficient of friction, material removal rate, and surface roughness. Also, the samples were studied under a scanning electron microscope, energy dispersive X-ray analysis, and X-ray diffraction analysis to investigate the dispersion, chemical composition, and elemental analysis of multi-walled carbon nanotubes in Al7075. The microscopic study of metal matrix composite samples shows a good dispersion of MWCNT into Al7075. Results show that the microhardness and tensile strength increase by 6% and 25%, respectively. The wear rate and coefficient of friction of composites are decreased by 39% and 48% at a sliding speed of 3 m/s.

Investigation on mechanical, wear, and machining characteristics of Al 7075/MWCNTs using the liquid state method

In the present research work, an attempt has been made to fabricate the aluminum metal matrix composite by the stir casting method. Aluminum 7075 alloy is used as a matrix which is reinforced with multi-walled carbon nanotubes (MWCNTs) with varying percentage (0 wt.%, 1.0 wt.%, 2.0wt.%, and 3.0 wt.%). Experiments were carried out to analyze microstructure, mechanical, tribological, and machining characteristics such as microhardness, tensile strength, wear rate, coefficient of friction, material removal rate (MRR), and surface roughness (Ra). Also, the samples were studied under a scanning electron microscope (SEM), energy dispersive X-ray analysis (EDAX), and X-ray diffraction analysis (XRD) to investigate the dispersion, chemical composition, and elemental analysis of multi-walled carbon nanotubes in Al 7075. The microscopic study of metal matrix composite samples shows a good dispersion of MWCNT into Al 7075. Results show that the microhardness and tensile strength increase by 6% and 25%. The wear rate and coefficient of friction of composites are decreased by 39% and 48% at a sliding speed of 3 m/s. In addition, the metal removal rate decreases by 40% and the surface roughness enhanced by 38% respectively.

TPU/PLA nanocomposites with improved mechanical and shape memory properties fabricated via phase morphology control and incorporation of multi‐walled carbon nanotubes nanofillers

AbstractShape memory polymer nanocomposites based on thermoplastic polyurethane (TPU)/polylactic acid (PLA) blends filled with pristine multi‐walled carbon nanotubes (MWCNTs) and modified MWCNTs─COOH were fabricated by direct melt blending technique and investigated for its morphology, mechanical, thermal, electrical, and shape memory properties. Morphological characterizations by using transmission electron microscope (TEM) and field emission scanning electron microscope (FESEM) revealed better dispersion of MWCNTs─COOH in the polymer blend, which is attributed to the improved interfacial interactions between the polymer blends and MWCNTs‐COOH. Loading of the MWCNTs‐COOH in the TPU/PLA blends resulted in the significant improvements in the mechanical properties such as tensile strength and elastic modulus and these effects are more pronounced on increasing the MWCNTs─COOH loading amount, when compared to the pristine MWCNTs filled system. Thermal analysis showed that the glass transition temperature of the blends increases slightly with increasing loading of both pristine and modified MWCNTs in the system. The resistance of nanocomposites decreased from 2 × 1012 Ω to 3.2 × 1010 Ω after adding 3% MWCNTs─COOH. The shape memory performance tests showed that the enhancement of shape recovery by 252% could be achieved at 3% MWCNTs loading, when compared to that of TPU/PLA blends.

Effect of Ultrasonic Stir Casting Technique on Mechanical and Tribological Properties of Aluminium–Multi-walled Carbon Nanotube Nanocomposites

This paper studies the enhancement of the mechanical and tribological properties of multi-walled carbon nanotubes (MWCNT)-reinforced aluminium nanocomposites prepared by ultra-sonication-assisted stir casting method. The investigations were made to assess the effect of MWCNT weight percentage on the property enhancement of nanocomposites. MWCNTs in 1, 2 and 3% weight is added to LM 9 grade aluminium and processed in a stir casting machine with an ultrasonic probe. The ultra-sonication during casting resulted in a better dispersion of MWCNTs in the base materials. The results indicate a significant improvement in the hardness of the nanocomposite. The wear rate and coefficient of friction of Aluminium–MWCNTs composite have notably reduced during the test on a pin on disk tribometer compared to LM 9 aluminium base material. The percentage of MWCNTs is found to be a significant factor, and there is a progressive improvement in the properties with 3 wt% of MWCNTs–Aluminium composite giving the best performance.

Non-covalent and covalent immobilization of Candida antarctica lipase B on chemically modified multiwalled carbon nanotubes for a green acylation process in supercritical CO2

• Efficient immobilization of Candida antarctica B lipase on modified MWCNTs. • Enzyme loading reaching as high as 21 wt.% for non-covalent immobilization. • Active O-acylation of geraniol into geranyl acetate by CAL-B in supercritical CO 2 . • Reaction regioselectivity unchanged through immobilization. • Development of a fully green enzymatic process. Candida antarctica B lipase (CAL-B) was immobilized on purified and functionalized multiwalled carbon nanotubes (MWCNTs). Both immobilization routes, physical adsorption and covalent bonding, were investigated. MWCNT functionalization by a non-aggressive oxidation by potassium permanganate led to an interesting balance between the hydrophilic and the hydrophobic areas of the MWCNT surface; the former being responsible of the good dispersion of MWCNTs in water and the latter having a favorable affinity with CAL-B. The enzyme loadings reached were significant: around 16 wt. % and 21 wt.% for non-covalent and covalent immobilization, respectively. The enzymatic activity was studied with the reaction of O-acylation of geraniol into geranyl acetate by CAL-B in supercritical CO 2 . Even if a decay in synthesis of geranyl acetate was observed over cycling for both CAL-B@MWCNT catalysts, it was demonstrated that the regioselectivity of CAL-B was unchanged through immobilization on the MWCNT surface for both routes. Interestingly, it was shown that a fully green enzymatic process can be achieved with these prepared CAL-B@MWCNT biocatalyst. Such approach could be transferred to other support/enzyme systems for developing new eco-friendly synthesis processes.

Experimental investigation on chloroprene and acrylonitrile butadiene rubber types reinforced with nano-materials

In this research, the effects of three different nano-materials (Nano-Carbon Black, Nano-ZnO, and Multi-Walled Carbon Nanotubes (MWNTs)) on two different rubber types (Chloroprene Rubber (CR), and Acrylonitrile Butadiene Rubber (NBR)) were experimentally investigated. In order to achieve this purpose, mechanical tests and detailed aging tests (in air, oil and fuel) were conducted conforming to international standards. Three different nano-materials were added to rubber with different combinations. A good dispersion of MWNTs within the polymer matrix was monitored by using field-emission Scanning Electron Microscopy (FE-SEM). It was observed that nano-materials both have positive and detrimental effects on hardness, tensile strength, ductility and aging tests performance. It was observed that nano-material reinforced rubber composites are thermally more stable than current products. Most significantly, it was seen that compression set value, which is a critical property for rubber grade, decreased with the addition of MWNTs. Therefore, rubber products with higher sealing capacity and longer service life can be obtained by adding MWNTs.

Enhanced Thermal Conductivity and Balanced Mechanical Performance of PP/BN Composites with 1 vol% Finely Dispersed MWCNTs Assisted by OBC

Abstract1 vol% multiwalled carbon nanotubes (MWCNTs) is finely dispersed in poly(propylene) (PP)/boron nitride (BN) composites with the assistance of commercial ethylene‐α‐octene block copolymer (OBC) through a conventional melt‐compounding method, whereas serious agglomeration of MWCNTs occurs in the melt compounded PP/MWCNTs/BN composites. The good dispersion of MWCNTs facilitates the formation of a better conductive network to synergistically improve the thermal conductivity of PP/OBC/MWCNT/BN composites, up to 1.71 W m−1 K−1 at a BN content of 20 vol%. Meanwhile, the elastomeric OBC component leads to markedly enhanced impact toughness (>8.0 kJ m−2) and elongation at break (>23%) of the composites. This work sheds light on the fabrication of thermally conductive polymer composites with balanced mechanical performance through a conventional processing technique.

Effect of carbon nanotubes content on the vulcanization kinetic in styrene–butadiene rubber compounds

Styrene–butadiene rubber compounds reinforced with commercial multiwall carbon nanotubes (MWCNT) in amounts between 0.5 and 10 parts per hundred of rubber (phr) were mixed in a two‐roll mill. A compound with 40 phr of carbon black (CB) was prepared as reference. From rheometric curves at five different temperatures (between 140°C and 180°C), a similar maximum torque and vulcanization time values in the samples reinforced with 10 phr of MWCNT and 40 phr of CB were obtained. The Kamal–Sourour model was used to analyze the influence of the MWCNT content and the vulcanization temperature on the cure rate and induction time. Then, through an Arrhenius plot, it became evident the effect of the reinforcement content on the activation energy of the vulcanization process. Mechanical properties of normalized sheets vulcanized at 160°C indicate that content between 5 and 10 phr of MWCNT are enough to reach a similar performance to that sample with 40 phr of CB. SEM analysis exhibits a good dispersion of MWCNT. Swelling experiments point out a similar absorption degree of toluene in the compounds with 5 phr of MWCNT and 40 phr of CB. POLYM. ENG. SCI., 59:E327–E336, 2019. © 2019 Society of Plastics Engineers

Poly(Dimethylbenzimidazolium) Iodide Assisted Dispersion of Multiwalled Carbon Nanotubes and Their Palladium Nanoparticle Hybrid

The multi walled carbon nanotubes (MWNTs) have always been as the catalyst supporting materials, but for high-performance composite catalysts, the dispersion and functionalization of MWNTs are important challenging problems. In this paper, Electrocatalytically active palladium nanoparticles (Pd NPs) on MWNTs with the high-performance and excellent solubility polymer, poly(dimethylbenzimidazolium) iodide (P(DMBI)-I−) as modifier and glue was first discussed. The results of transmission electron microscopy (TEM) demonstrate a better dispersion of MWNTs with the assist of P(DMBI)-I−. The Raman spectra indicate a strong π-π interaction between MWNTs and P(DMBI)-I−. Taking advantages of the coordination effect of imidazole groups and the electrostatic attraction to Pd NPs, the prepared Pd/MWNTs-P(DMBI)-I−(Pd/MPDI−) hybrid is of well electrocatalytic activity to the ethanol fuel cells by electrochemical measurements. So it is believed that P(DMBI)-I− can be further applied in the dispersion of different carbon-based materials and metal nanoparticles for fabricating more novel composites for catalyst and electrode material.

Fabrication of multi-walled carbon-nanotube-grafted polyvinyl-chloride composites with high solar-thermal-conversion performance

The optical absorption properties of carbon nanotubes (CNTs) have attracted extensive research attention. Here we report the fabrication of sea-island structured polymer-based multi-walled CNT (MWNT) composite with high solar-thermal-conversion performance. MWNT-grafted 4-chloromethyl styrene (MWNTs-g-CMS) is prepared via esterification between carboxyl groups on the MWNT surface and the chloromethyl group of the CMS in the presence of a phase-transfer reagent in water. Covalent bonding between the CMS and the MWNTs is confirmed by Fourier transform infrared spectra. Thermogravimetric analysis of the MWNTs-g-CMS shows a mass percentage of the attached methyl styrene chains as high as 24.31 wt%. Subsequently, polymer-based MWNT-graft-polyvinyl-chloride (MWNTs-g-PVC) composite was prepared via an in-situ graft polymerization between the vinyl chloride and active styryl groups of the MWNTs-g-CMS. The MWNT grafting efficiencies in a series of MWNTs-g-PVC composites are 0.013–0.103%. The sea-island structure of the MWNTs-g-PVC composites and the fine dispersion of MWNTs in the island are verified by electron microscopy. The solar-thermal conversion performance of the MWNTs-g-PVC composites is studied. The composites exhibit excellent light-absorption properties that resemble a black body, and yield a higher solar-thermal conversion efficiency than the carboxylic MWNT (PVC/MWNTs-COOH) composites, which is attributed to the sea-island structure and the good dispersion of MWNTs in the islands.

The effect of crystallization behavior on high conductivity, enhanced mechanism and thermal stability of poly(ε-caprolactone)/multi-walled carbon nanotube composites

Poly(ε-caprolactone) (PCL) composites filled by multi-walled carbon nanotubes (MWCNTs) which was non-covalently modified by the combined surfactants of poly(sodium 4-styrenesulfonate) and cetyltrimethyl-ammonium bromide (PSS-CTAB) were fabricated via simple solution precipitation method. PCL/MWCNTs composites provided with the low procolation threshold (0.4 wt%) and high electrical conductivity due to good dispersion of MWCNTs. And the excellent mechanical properties and enhanced thermal stability were also obtained with the addition of modified MWCNTs. In addition, all PCL composites showed significantly enhanced crystallization with increasing the MWCNTs contents, which demonstrated that the MWCNT-induced crystallization of PCL could effectively regulate the properties of composites. In a word, introducing non-covalent functionalized MWCNTs in the polymer system was a promising way for developing excellent conductive composites.