Thermal property improvement of polytetrafluoroethylene nanocomposites with graphene nanoplatelets

Jiang, Zeyi; Zhang, Xinru; Gao, Ting; Yue, Kai

doi:10.1039/c8ra01047a

Cited by 31 publications

(21 citation statements)

References 43 publications

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“…In order to conquer defects of neat PTFE, several researchers have investigated enhance properties based on PTFE, such as creep resistance, abrasion resistance, and higher thermal stability Cai et al . fabricated graphene nanoplatelet (GNP)–PTFE nanocomposites through liquid phase exfoliation of graphite sheets in ethanol with tip sonication.…”

Section: Introductionmentioning

confidence: 99%

Effect of tensile rates on thermal and mechanical properties of porous PTFE composites

Kou

Pan

et al. 2019

J of Applied Polymer Sci

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To achieve polymer‐matrix composites for sealing materials with thermostability and toughness, PTFE composites filled with short glass fibers (SGFs) were hyperthermal stretched to prepare a substrate material with high thermal stability and porosity. The effects of various tensile rates on the thermal and mechanical properties and morphologies were investigated. The results revealed that the thermal stability could be improved slightly and the thermal expansion coefficient of composites increased by the tensile rate. Through observing the morphologies, tensile process produced cavities and the increased tensile rate had negligible effects on porosity, which also could be proved by density test. From mechanical properties analysis, stretched composites exhibited that the tensile strength increases first and then decreases with the increased tensile rate. Although the variation tendency of Young's modulus is similar to that of tensile strength, which is smaller than that of unstretched composite. When the tensile rate reached 50 mm·min−1, the tensile strength and Young's modulus of the stretched composites increased by 65 and 9% to maximum, respectively. Meanwhile, elongation at break and shore hardness decreased. The thermal and mechanical properties improvement could be ascribed to the strain‐induced crystallization and crystal alignment. In addition, the interplanar spacing and grain size were inversely proportional to the tensile rate. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48175.

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Section: Introductionmentioning

confidence: 99%

Effect of tensile rates on thermal and mechanical properties of porous PTFE composites

Kou

Pan

et al. 2019

J of Applied Polymer Sci

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“…Graphene is a kind of two-dimensional layered material with an exceptionally high Young’s modulus of ~ 1.0 Tpa, ultrahigh thermal conductivity of ~ 5000 W/(m · K), high transmittance of 97.7%, high intrinsic mobility of ~ 200,000 cm 2 /(V · s), and extremely high resistance to gas permeation [ 1 – 3 ]. Because of these outstanding properties, graphene has great potential for many applications including sensors, electronic devices, advanced polymer nanocomposites, energy storage, solar cells, smart coatings, ultrafast lasers, catalysis, and biological labeling [ 2 , 4 – 6 ]. The unique properties and potential applications have led to researchers exploring promising methods to produce graphene in the past several years.…”

Section: Introductionmentioning

confidence: 99%

Effects of Tip Sonication Parameters on Liquid Phase Exfoliation of Graphite into Graphene Nanoplatelets

Jiang

Zhang

2018

Nanoscale Res Lett

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Graphene nanoplatelets (GNPs) can be produced by exfoliating graphite in solvents via high-power tip sonication. In order to understand the influence of tip sonication parameters on graphite exfoliation to form GNPs, three typical flaked graphite samples were exfoliated into GNPs via tip sonication at power of 60, 100, 200, or 300 W for 10, 30, 60, 90, 120, or 180 min. The concentration of GNP dispersions, the size and defect density of the produced GNPs, and the sedimentation behavior of GNP dispersions produced under various tip sonication parameters were determined. The results indicated that the concentration of the GNP dispersions was proportional to the square root of sonication energy input (the product of sonication power and time). The size and ID/IG values (determined by Raman spectrum) of GNPs produced under various tip sonication powers and times ranged from ~ 1 to ~ 3 μm and ~ 0.1 to ~ 0.3, respectively, which indicated that all the produced GNPs were of high quality. The sedimentation behavior of GNP dispersions showed that the dispersions were favorably stable, and the concentration of each GNP dispersion was ~ 70% of its initial concentration after sedimentation for 96 h. Moreover, the TEM images and electron diffraction patterns were used to confirm that the produced GNPs were few-layer. This study has important implications for selecting the suitable tip sonicating parameters in exfoliating graphite into GNPs.Electronic supplementary materialThe online version of this article (10.1186/s11671-018-2648-5) contains supplementary material, which is available to authorized users.

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“…49,50 Previous reports showed that PTFE reinforced by graphene nanoplate as a filler had the same melting temperature (Tm) to that of pure PTFE (Tm=317°C) but the degree of crystallinity (X c ) was significantly increased. 51 According to our results, improvement of thermal stability of PTFE/PVA with the addition of GO nanoparticles was not significant. It could What is the current knowledge?…”

Section: Alizarin Red S Stainingmentioning

confidence: 60%

“…be explained by increasing the -O containing groups in composite after incorporation of GO nanoparticles, and also probably the mobility behavior of carbon-carbon polymer skeleton. 51,52 The deformation behavior of the scaffolds was examined using compression tests. PP and PPG scaffolds revealed respective compressive modulus of 130 and 620 kPa which means that the PPG scaffold is stiffer than PP scaffold.…”

Section: Research Highlightsmentioning

confidence: 99%

Freeze-dried multiscale porous nanofibrous three dimensional scaffolds for bone regenerations

et al. 2020

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Introduction: Simulating hydrophobic-hydrophilic composite face with hierarchical porous and fibrous architectures of bone extracellular matrix (ECM) is a key aspect in bone tissue engineering. This study focused on the fabrication of new three-dimensional (3D) scaffolds containing polytetrafluoroethylene (PTFE), and polyvinyl alcohol (PVA), with and without graphene oxide (GO) nanoparticles using the chemical cross-linking and freeze-drying methods for bone tissue application. The effects of GO on physicochemical features and osteoinduction properties of the scaffolds were evaluated through an in vitro study. Methods: After synthesizing the GO nanoparticles, two types of 3D scaffolds, PTFE/PVA (PP) and PTFE/PVA/GO (PPG), were developed by cross-linking and freeze-drying methods. The physicochemical features of scaffolds were assessed and the interaction of the 3D scaffold types with human adipose mesenchymal stem cells (hADSCs) including attachment, proliferation, and differentiation to osteogenic like cells were investigated. Results: GO nanoparticles were successfully synthesized with no agglomeration. The blending of PTFE as a hydrophobic polymer with PVA polymer and GO nanoparticles (hydrophilic compartments) were successful. Two types of 3D scaffolds had nano topographical structures, good porosities, hydrophilic surfaces, thermal stabilities, good stiffness, as well as supporting the cell attachments, proliferation, and osteogenic differentiation. Notably, GO incorporating scaffolds provided a better milieu for cell behaviors. Conclusion: Novel multiscale porous nanofibrous 3D scaffolds made from PTFE/ PVA polymers with and without GO nanoparticles could be an ideal candidate for bone tissue engineering as a 3D template.

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Thermal property improvement of polytetrafluoroethylene nanocomposites with graphene nanoplatelets

Abstract: Adding GNPs into PTFE can significantly improve the thermal properties of nanocomposites.

Cited by 31 publications

References 43 publications

Effect of tensile rates on thermal and mechanical properties of porous PTFE composites

Effect of tensile rates on thermal and mechanical properties of porous PTFE composites

Effects of Tip Sonication Parameters on Liquid Phase Exfoliation of Graphite into Graphene Nanoplatelets

Freeze-dried multiscale porous nanofibrous three dimensional scaffolds for bone regenerations

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