Good Dispersion Of Graphene Oxide Research Articles

Bio‐based PA56/GO nanocomposite fiber with 1.2 GPa strength via in situ precipitation and solvent‐free polymerization

AbstractToward high‐strength bio‐based polyamide 56 (PA56) fiber, we first in situ precipitate graphene oxide (GO), adipic acid and 1,5‐pentanodiamine together by reaction crystallization in ethanal to obtain PA56 salt/GO particles with well dispersed GO, then prepare PA56/GO nanocomposite with PA56 salt/GO via solvent‐free polymerization including solid‐state prepolycondensation and melt polycondensation. Finally, PA56/GO nanocomposite fiber is prepared by extrusion drawing. With 0.2 wt% GO, the tensile strength of PA56/GO fiber reaches 1050 MPa, which is 3.3 times that of pure PA56 fiber. Furtherly, we add PA56/GO with high GO content to commercial PA56 to prepare the hybrid fiber, of which the tensile strength reaches 1248 MPa. The great improvement is mainly due to the good dispersion of GO in the whole process, which increases the heterogeneous nucleation in favor of higher and oriented PA56 crystallization.Highlights Bio‐based PA56/GO nanocomposite fiber with 1.2 GPa strength has been prepared. PA56 salt/GO particles with well‐dispersed GO are in situ precipitated. Solvent‐free polymerization is used instead of solution melt polymerization. Well‐dispersed GO results in high and oriented crystallinity of PA56/GO fiber. Tensile strength of PA56/GO fiber is 2.3 times that of commercial PA56 fiber.

Investigation of the structure-property relation for graphene oxide based acrylonitrile butadiene styrene nanocomposites

The improvement of the structure-property relation in nanocomposites between different polymer matrices and the embedded nano-additives has become a strategic blueprint for many academic counterparts around the globe. In this work, different loadings of graphene oxide (GO) varied from 1.0 to 3.0 wt. % were mixed with acrylonitrile butadiene styrene (ABS) using solution casting approach. The resulted nanocomposites underwent to spectral, structural, morphological, mechanical, thermal and thermomechanical tests. Different kinds of instruments associated with each test were employed to draw a professional conclusion about the potential improvement in structure-property relation. The targeted improvement was achieved as spectral, structural and morphological investigations confirmed the interaction, structural variation, and good dispersion of GO in ABS; respectively. Furthermore, as GO loadings went higher, the mechanical, thermal, and thermomechanical performances for the nanocomposites were improved compared to the neat polymer. Young’s modulus, tensile strength, thermal decomposition, and visco-elastic properties showed an enhancement compared to the neat polymer. The mechanical and thermomechanical performances for the nanocomposites recorded significant promotions.

TEMPO-Oxidized Cellulose Nanofibril Films Incorporating Graphene Oxide Nanofillers.

To design a new system of novel TEMPO-oxidized cellulose nanofibrils (TOCNs)/graphene oxide (GO) composite, 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidation was utilized. For the better dispersion of GO into the matrix of nanofibrillated cellulose (NFC), a unique process combining high-intensity homogenization and ultrasonication was adopted with varying degrees of oxidation and GO percent loadings (0.4 to 2.0 wt%). Despite the presence of carboxylate groups and GO, the X-ray diffraction test showed that the crystallinity of the bio-nanocomposite was not altered. In contrast, scanning electron microscopy showed a significant morphological difference in their layers. The thermal stability of the TOCN/GO composite shifted to a lower temperature upon oxidation, and dynamic mechanical analysis signified strong intermolecular interactions with the improvement in Young's storage modulus and tensile strength. Fourier transform infrared spectroscopy was employed to observe the hydrogen bonds between GO and the cellulosic polymer matrix. The oxygen permeability of the TOCN/GO composite decreased, while the water vapor permeability was not significantly affected by the reinforcement with GO. Still, oxidation enhanced the barrier properties. Ultimately, the newly fabricated TOCN/GO composite through high-intensity homogenization and ultrasonification can be utilized in a wide range of life science applications, such as the biomaterial, food, packaging, and medical industries.

Structure and Properties of Polystyrene-Co-Acrylonitrile/Graphene Oxide Nanocomposites

Polymer/graphene nanocomposites have attracted significant attention from the research community over the past two decades. In this work, nanocomposites of polystyrene-co-acrylonitrile (SAN) and graphene oxide (GO) were prepared using a solution blending method with tetrahydrofuran as the solvent. The GO loadings used were 0.1, 0.25, 0.5, and 1.0 wt.%. Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy were employed to characterize the structure and morphology of SAN/GO nanocomposites. Thermal analysis showed increases in the glass transition (Tg) and peak thermal degradation (Tdpeak) temperatures of SAN by the additions of GO, with Tg increasing by 3.6 °C and Tdpeak by 19 °C for 1.0 wt.% GO loading. Dynamic mechanical analysis revealed that the storage modulus of SAN was also enhanced with the incorporations of GO by up to 62% for 1.0 wt.% loading. These property enhancements may be attributed to a good dispersion of GO in the polymer matrix and their interfacial interactions.

Compatibilization of Immiscible PA6/PLA Nanocomposites Using Graphene Oxide and PTW Compatibilizer for High Thermal and Mechanical Applications

The aim of this work is synthesis a novel nanocomposite containing Polylactide (PLA) and polyamide 6 (PA6) reinforced with graphene oxide (GO) and poly ethylene-butyl acrylate-glycidyl methacrylate) (PTW) compatibilizer during solvent-based method. For this purpose, GO was added to the nanocomposite with 0.1, 0.3, 0.5, 0.7 and 1 phr. Morphology, rheology and mechanical properties of nanocomposites were studied with scanning electron microscopy (SEM), transmission electron microscopy (TEM) and (DMTA) which showed rougher fracture surface due to the presence of compatibilizer and an increase in the amount of graphene oxide and better dispersion of graphene oxide. The results of experimental and theoretical studies of mechanical properties showed that increasing the concentration of graphene oxide in the presence of PTW improved the tensile strength, impact strength and tensile modulus in the PA6/PTW/PLA system. The study of rheological properties showed an increase in storage modulus and complex viscosity, which also confirmed the role of PTW compatibilizer in better GO dispersion. So, PA6/PTW/PLA is a good candidate for mechanical and high thermal applications.

Methyl orange assisted dispersion of graphene oxide in the alkaline environment for improving mechanical properties and fluidity of ordinary portland cement composites

Graphene oxide (GO) as a nano-reinforcing filler has great potential to improve the performance of cement-based composites, however, many challenges must be solved. Recent research has shown that GO tends to coagulate in the alkaline cement pore solution , limiting its reinforcement efficiency to improve the properties of cement composites . In this study, with polycarboxylic ether superplasticizer (PCE) as the main dispersant, methyl orange (MO) was further added to improve the dispersity of GO. The effect of MO on the dispersion of GO in saturated Ca(OH) 2 solution was investigated by UV-Vis spectrophotometer, Zeta potentiometer and atomic force microscope . Very low content of MO could significantly improve the colloidal stability of GO in CH solution and the optimal dispersion of GO was achieved when the mass ratio of GO to MO was 1:1. The effect of MO-dispersed GO on cement composites was investigated through mechanical strength analysis, microscopic analysis and chloride ion permeation analysis. The results showed that when the mass ratio was 1:1 and the content of GO was 0.03%, the 3d and 28d flexural strengths of cement mortar (0.03%-GO@MO) were increased by 27.4% and 15.4%, and the compressive strengths were increased by 21.8% and 15.3%, respectively, compared with the 0.03% GO-reinforced cement mortar(0.03%-GO). The chloride ion migration coefficient of 0.03%-GO@MO was 8.18%, lower than that of 0.03%-GO, which was caused by the denser internal structure of the former. Microscopic tests showed that the addition of MO could promote the dispersion of GO in cement pore solution, regulate the growth of cement hydration crystal and make the cement slurry structure denser. The addition of MO could reduce the loss of fluidity of the fresh slurry caused by GO. This study might provide a low-cost method to simultaneously improve the dispersion of GO in cement pore solution and the workability of GO-blended cement mortar and had many potential practical applications. • In the presence of PC, methyl orange could significantly improve the dispersion of GO in cement pore solution. • MO compensated the loss of the fluidity of the fresh cement slurry caused by the addition of GO. • Compared with GO-reinforced cement, the mechanical properties of MO@GO modified cement had been further improved. • The low-priced MO affords good dispersion of GO for the potential engineering application of cement-based composite.

Analysis and modeling of modified styrene–acrylonitrile/carboxylated acrylonitrile butadiene rubber nanocomposites filled with graphene and graphene oxide: Interfacial interaction and nonlinear elastoplastic behavior

AbstractNonlinear elastoplastic behavior of the nanocomposites based on the styrene–acrylonitrile/carboxylated acrylonitrile butadiene rubber (SAN/XNBR) blend was investigated using experimental and theoretical analysis. Graphene, graphene oxide nanoparticles, and glycidyl methacrylate‐grafted‐XNBR (XNBR‐g‐GMA) as a compatibilizer were incorporated in the SAN/XNBR blends. In this regard, the focus of this study is on modeling of the stress–strain behavior of these nanocomposites, considering the effect of the interfacial interactions made by compatibilizer. For this purpose, field emission scanning electron microscopy (FESEM) and transmission electron microscope (TEM) techniques were used to investigate the relationship between microstructure and mechanical properties of nanocomposites. In addition, FESEM and TEM images showed that the presence of a compatibilizer could influence the dispersion and localization of the nanoparticles. According to the tensile test results, the presence of the compatibilizer increased the mechanical properties of the nanocomposites, specifically elongation at break. Considering the nanocomposite containing compatibilizer and graphene oxide, the elongation at break increased about 570% compared with the nanocomposite without compatibilizer. Better dispersion of graphene oxide and the creation of chemical interaction among components in the presence of the XNBR‐g‐GMA compatibilizer could be the reasons for these improvements, as confirmed by TEM. The usage of the Bergstrom–Boyce model for analyzing the nonlinear elastoplastic behavior of the nanocomposites illustrated proper conformity with the experimental data in the elastic region. However, there are some deviations in the viscoplastic region, particularly close to the breaking elongation region.

Enhanced cryogenic mechanical properties of carbon fiber reinforced epoxy composites by introducing graphene oxide

In this work, graphene oxide (GO) with a content in a range of 0.0–0.5 wt% was introduced to modify epoxy resin. The room temperature (RT) and cryogenic temperature (77 K) mechanical properties were systematically studied for the carbon fiber/GO-modified epoxy composites prepared by hot-press molding process. The results show that a good dispersion of GO in epoxy resin leads to an enhanced carbon fiber-epoxy matrix interfacial adhesion. It is observed that the cryogenic mechanical properties of the CF/epoxy composites are obviously enhanced by introducing GO. The optimal GO content is found to be 0.2 wt% for effectively improving the cryogenic flexural and interlaminar shear strength of carbon fiber reinforced epoxy composites. In addition, it is exhibited that the mechanical properties at 77 K of CFRP composites are higher than those at RT. Consequently, the modification of epoxy resin by introducing GO is a promising means for achieving high cryogenic mechanical performance CFRP composites.

Novel approach to enhance light absorption of porphyrin/graphene oxide composites by PH and concentration modification for energy applications

Graphene oxide (GO) decorated with nanostructured porphyrin (PN) was synthesized and the interfacial interaction between these two components were investigated by using Scanning electron microscopy (SEM), X-ray, and UV-Visible absorption spectroscopy. These techniques showed good dispersion of GO and PN as well as a π-π intermolecular interaction confirming the energy/charge transfer. Moreover, X-ray diffraction study confirmed the intercalation of PN in GO and their disaggregation. The UV-Visible results showed an important interaction between GO and porphyrin nanorods under different pH values and concentrations resulting in the enhancement of optical absorption of GO-PN. The findings presented here are important to achieve the functionalization of graphene oxide with PN for various optoelectronic applications.

Thermal, Mechanical Properties and Rheological Behavior of Poly(Propylene Carbonate)/Poly(Ethylene Glycol)/Graphene Oxide Nanocomposites

Graphene oxide (GO) is an efficient nanofiller for polymers and a good dispersion of GO in polymer matrix is most important to enhance properties. Poly(propylene carbonate) (PPC)/GO nanocomposite was prepared by a method with solution blending and melt mixing for improvement of GO dispersion. First, GO was prepared using an improved Hummers method. In the solution blending, GO was well dispersed in water and another low molecular weight polymer, poly(ethylene glycol) (PEG), was also dispersed in water, as a dispersion medium for next melt mixing of PPC and GO. Then PPC and PEG/GO was melt-mixed in a HAAKE mixer. The dispersion of GO in PPC matrix and effect of GO content on properties of PPC/PEG/GO nanocomposites was investigated. Results show that tensile strength of nanocomposites with the content of 0.5 wt% GO increased from 17.51 MPa (pure PPC) to 21.61 MPa and elongation at break can be kept high. The complex viscosity, storage and loss modulus is the highest for nanocomposites with the content of 0.5 wt% GO. This illustrated that a lower content of GO can improve the properties of PPC, owing to the good dispersion of GO in PPC matrix. Based on dispersion of GO and chemical structure of PPC, PEG, and GO, the reinforcement mechanism of GO in PPC was analyzed.

Synthesis of polyaniline-modified graphene oxide for obtaining a high performance epoxy nanocomposite film with excellent UV blocking/anti-oxidant/ anti-corrosion capabilities

This paper focuses on the synthesis and modification of graphene oxide nanosheets with polyaniline. The main aim is to take the advantages of both graphene oxide and polyaniline in enhancing the long-term performance (including weathering and corrosion) of exterior nanocomposites. For this purpose, the synthesized graphene oxide was treated via an in-situ polymerization process. The modified hybrid nanosheets were characterized by Fourier transform infrared spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FE-SEM), X-ray diffraction analysis (XRD), Ultraviolet–visible spectrophotometry (UV–Vis) and Raman spectroscopy. It was approved that the emeraldine base form of polyaniline has been successfully polymerized on the graphene oxide nanosheets in two forms of non-covalent bonding through π-π interactions between quinoid ring of PANI and basal plane of graphene oxide, and covalent bonding through reaction with epoxide group. The modified nanosheets were introduced into a typical epoxy matrix and then subjected to accelerated weathering and corrosion cycles. The results revealed that a considerable improvement in both weathering (42% reduction in ΔE) and corrosion resistance was achieved which was mainly attributed to the considerable enhancement in UV shielding, radical scavenging as well as better dispersion of graphene oxide modified with polyaniline.

Confinement of functionalized graphene oxide in sulfonated poly (ether ether ketone) nanofibers by coaxial electrospinning for polymer electrolyte membranes

A novel cambiform-like core-shell nanofiber containing sulfonated graphene oxide core is fabricated through coaxial electrospinning method to improve proton conductivity, fuel blocking and inorganics/polymer compatibility for fuel cell applications. As induced by the strong electrostatic force, the sulfonated organosilane functionalized graphene oxide nanosheet is axially elongated to form a unique cambiform-like and highly wrinkled morphology in the core of the sulfonated poly (ether ether ketone) nanofiber, which is evidenced by the transmission electron microscopy images. It provides a forced contact and good dispersion of graphene oxide in the polymer to improve the tensile strength (approximately 2.6 and 1.8 folds of that of the blend monoaxial electrospun and cast membranes, respectively). The wrinkled graphene oxide core contains the sulfonated functional groups and micro-voids which are favorable for water uptake, making the co-spinning membrane exhibit approximately 43.2% and 33.0% increase of water uptake compared with that of the blend monoaxial electrospun and cast membranes, respectively, and thus facilitate the formation of hydrogen bond networks for proton hopping but tortuous pathways for fuel permeation. Accordingly, both lower hydrogen permeation and much higher methanol selectivity (11 folds of that of Nafion 115) are achieved in the co-spinning membrane.

Morphology, thermal and mechanical properties of epoxy adhesives containing well-dispersed graphene oxide

Graphene oxide (GO) is prepared and introduced into epoxy resins through a wet-transfer migration technique using a three-roll mill. The results of TEM, XRD and digital microscope observation show that good dispersion of GO is achieved without using any additives. The mechanical and thermal properties of GO/epoxy (GO/EP) adhesives are enhanced with GO incorporated. A 10.2% increase in Young's modulus and a 56.3% increase in elevated-temperature (120 °C) lap shear strength (LSS) was observed on addition of 1.0 wt% GO, compared to the neat epoxy adhesive. Increased glass transition temperature and improved thermal stability of the GO/EP adhesives are also observed in the DMA and TG analysis. Moreover, the toughness of the GO/EP adhesives is improved and much rougher fracture surface can be observed compared with the neat epoxy adhesive. No GO agglomeration can be observed in the SEM images of GO/EP adhesive with 1.0 wt% loading.

Effect of tunable styrene content on achieving high-performance poly(styrene-b-ethylene-ran-butylene-b-styrene)/graphene oxide nanocomposites

In this paper, two poly(styrene-b-ethylene-ran-butylene-b-styrene) (SEBS) with different styrene segment content were adopted to explore the relationship between varying π-π stacking interaction and the mechanical performance of polymer composites. The results showed that the high styrene content on SEBS (SEBS-30, 30 wt% styrene segment) endows SEBS a stronger π-π stacking interaction with GO and a better dispersion of GO in the matrix than that in SEBS with low styrene content (SEBS-12, 12 wt% styrene segment), resulting in a high efficiency on enhancing the performance of SEBS. By adding 0.5 wt% GO, the tensile strength and modulus of SEBS-30 was increased by 44% and 64%, respectively, while that of SEBS-12 was increased by 24% and 39%. Furthermore, the GO also exhibited the ability to toughen SEBS via forming microcrack and GO-induced fibrillation of SEBS during the fracture process. The elongation at break and fracture toughness of SEBS-30 was increased by 10% and 64%, respectively. This study gives us a deep insight into the influence of varying π-π stacking interaction between graphene oxide (GO) and polymer on achieving high-performance polymer nanocomposites.

Dielectric relaxations and conductivity of cross-linked PVA/SSA/GO composite membranes for fuel cells

Composite membranes obtained from Poly(vinyl Alcohol) (PVA) with sulfosuccinic acid (SSA) as crosslinking agent, and two different proportions of graphene oxide (GO), were prepared to be used in Proton Exchange Membrane Fuel Cells (PEMFCs). The superficial micrographs from transmission electron microscopy (TEM) confirmed a good dispersion of GO. Fourier Transform Infrared spectroscopy (FTIR) was used to evaluate the final chemical structure. Differential Scanning Calorimetry (DSC) showed that glass transition and crystalline phase were not present in the cross-linked PVA/SSA/GO composites membranes. Thermogravimetric analysis (TGA) demonstrated that the addition of GO reduced the moisture content and increased the thermal stability of the membranes. The electrical properties of PVA/SSA and PVA/SSA/GO composite membranes and the effect of GO concentration were evaluated by means of dielectric spectra in a broad range of temperatures and frequencies. The dielectric permittivity of these membranes was significantly promoted at low filler concentration due to an interfacial polarization effect. From the analysis of the dielectric relaxation spectrum, it can be deduced that the origin of the associated molecular movements is intramolecular and occurs in the working range of the PMEFC. In addition, the direct current conductivity, the protonic conductivity, and the polarization currents were correlated to the power produced in a hydrogen monocell. It was observed that low and no high GO concentrations of filler in PVA/SSA composite membranes enhanced their performance. The systematic characterization procedure based on the study of dielectric spectra and conductivity allowed to establish a potential approach to control the addition of GO in the design of other composite membranes for PEMFC with improved properties.

Starch‐graphene oxide bionanocomposites prepared through melt mixing

ABSTRACTBionanocomposites (BNCs) of waxy corn starch, glycerol, and graphene oxide (GO) or graphite oxide (GrO) were prepared by melt mixing. First, the GrO was pre‐exfoliated in a water solution using ultrasound at 1 wt %. Small‐angle X‐ray scattering was used to determinate the interlaminar separation of GrO and transmission electron microscopy, Fourier infrared spectroscopy, and thermogravimetric analysis were used to characterized the GrO. Next, BNCs were characterized by X‐ray diffraction, scanning electron microscopy, thermogravimetric analysis, and mechanical property measurements. A complete exfoliation of GrO was obtained in the waxy corn matrix. Amorphous X‐ray patterns of the BNCs were observed, indicating that the exfoliated GO avoid the retrogradation of starch. According to scanning electron microscopy results, the BNCs showed an irregular texture and a good dispersion of GO, while thermoplastic starch showed a smooth morphology with a fragile structure. The BNCs exhibited higher thermal stability than thermoplastic starch. The tensile strength and the Young's modulus increased by 140% and 230% at a GO loading levels of 0.5% due to good interfacial interactions of GO and the waxy corn starch matrix. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46037.

Tailoring rubber-filler interfacial interaction and multifunctional rubber nanocomposites by usage of graphene oxide with different oxidation degrees

Abstract In this paper, graphene oxide (GO) with different oxidation degrees were prepared by a modified Hummers' method, and were filled into carboxylated acrylonitrile butadiene rubber (XNBR) by latex co-coagulation method. The impact of oxidation degrees on the structure of GO, the interaction between GO and XNBR, the mechanical properties and thermal conductivity of XNBR nanocomposites were investigated. The results indicated that interfacial interaction between XNBR and GO became stronger with the increase of oxidation degrees of GO due to more oxygen-containing groups forming on the GO sheets and hydrogen bonding in the XNBR/GO nanocomposites, which led to a better dispersion of GO in rubber matrix as well as improved mechanical properties and thermal conductivity of XNBR matrix. Especially, in comparison with those of neat XNBR, the tensile strength, tear strength and thermal conductivity of XNBR/GO nanocomposites with 4 phr (parts per hundred rubber) GO3 increased by 114.6%, 88.5% and 27.2%, respectively.

Steric stabilization of graphene oxide in alkaline cementitious solutions: Mechanical enhancement of cement composite

Graphene oxide (GO) with extraordinary properties has been regarded as a good candidate to reinforce cementitious materials. Due to a variety of oxygen functionalities, GO can be well dispersed in aqueous solutions but unstable in the presence of alkaline cementitious solutions, which restricts the fully utilization of GO to the mechanical enhancement of cementitious materials. In this study, a stabilized GO aqueous solution by pre-adding polycarboxylate-ether (PCE) copolymer was obtained before mixing with cement. The experimental results indicated that PCE can significantly improve the dispersion and stability of GO in alkaline cementitious solutions due to the stronger steric repulsion and hydrogen bonding. However, GO suddenly agglomerated when it was firstly mixed with cement by a rapid physical and chemical interaction, and post-addition of PCE has negligible helps to de-flocculate the GO. In terms of mechanical properties, cement paste with the stabilized GO-PCE showed higher flexural and compressive strength in comparison to that without PCE due to the better dispersion of GO in the hardened cement matrix. In conclusion, the prerequisite to make GO contribute more to the mechanical enhancement of cement paste is to ensure the good dispersion of GO in alkaline cementitious solutions achieved by pre-adding PCE.

Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)/Graphene Oxide Nanocomposite Films: Thermomechanical Properties, Oxygen Transmission Rates, and Hydrolytic Degradation

In this study, poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV)/graphene oxide (GO) nanocomposite films containing various content of GO were prepared using solution casting method. The effect of GO content on Young`s modulus and dispersion of GO in PHBV matrix was investigated. Also, the thermomechanical properties, oxygen transmission rates and hydrolytic degradation of PHBV/GO nanocomposite films were studied. The addition of GO into PHBV improves the Young`s modulus and decreases thermal expansion coefficient. The improvement can be mainly attributed to good dispersion of GO and interfacial interactions between PHBV and GO. Furthermore, PHBV/GO nanocomposite films show good oxygen barrier properties. PHBV/GO nanocomposites show lower hydrolytic degradation rates with increasing content of GO.

Structure and conformation of polyetheramine in confined space of graphene oxide and its enhancement on the electrically conductive properties of monomer casting nylon-6

Graphene oxide (GO) was functionalized with polyetheramine (PEA) and MC nylon-6/reduced GO (rGO)-PEA composites were in situ synthesized. Intermolecular covalent and hydrogen bonding was confirmed to form for GO/PEA molecules, and the grafting ratio and average layer thickness exhibit a significant increase with PEA loading. Meanwhile the interlayer spacing (d002) of GO-PEA increases steadily, and PEA chains adopt trans and planar zigzag conformation with arrangements of monolayer, bilayer in GO layers in the range of 100–400% PEA, while the completely exfoliated state of GO formed by saturation intercalation of 700% PEA. Compared with GO, the layer stacking of GO-PEA is much more weakened, exhibiting a wrinkled and almost monolayer dispersion state, which leads to a good dispersion of GO (rGO)-PEA in melting caprolactamand a much higher uniformity for the nylon-6 composites. The electrically conductive network formed, resulting in the remarkably improved electrical conductivity of the composites.