The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Han Wang - One of the best experts on this subject based on the ideXlab platform.
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Mechanical Reinforcement of graphene poly vinyl chloride composites prepared by combining the in situ suspension polymerization and melt mixing methods
Composites Part B-engineering, 2017Co-Authors: Han Wang, Zhe Ying, Yu Tong, Minghe Fang, You ZengAbstract:Abstract In order to obtain uniform dispersion of graphene and significant Mechanical Reinforcement of graphene filled poly(vinyl chloride) (PVC) composites, we used in-situ suspension polymerization to obtain graphene/PVC compounded resins with uniform dispersion of graphene, and subsequently prepared graphene/PVC composites using conventional melt-mixing technique. The microstructure, graphene dispersion, Mechanical and thermal properties of the nanocomposites were investigated in detail. We found that the combination of in-situ polymerization and melt-mixing was effective in obtaining graphene/PVC composites with uniform graphene dispersion and significant Mechanical Reinforcement. The tensile strength, impact toughness, and thermal stability of the nanocomposites were greatly improved even at an extremely low graphene loading (0.3 wt%), which is mainly attributed to the uniform dispersion of graphene and strong graphene-PVC interactions. By virtue of their excellent Mechanical properties and easy production, the graphene/PVC composites have great potential to be used as high-performance composites in many fields.
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enhanced Mechanical properties of multi layer graphene filled poly vinyl chloride composite films
Journal of Materials Science & Technology, 2015Co-Authors: Guiyuan Xie, Han Wang, Zhe Ying, Yu Tong, You ZengAbstract:In order to improve Mechanical properties of soft poly(vinyl chloride) (PVC) films, we used commercial multi-layer graphene (MLG) with large size and high structural integrity as reinforcing fillers, and prepared MLG/PVC composite films by using conventional melt-mixing methods. Microstructures, static and dynamic Mechanical properties of the MLG/PVC composite films were investigated. The results showed that a small amount of MLG loading could greatly increase the Mechanical properties of the MLG/PVC composites. The tensile modulus of the 0.96 wt% MLG/PVC composites was up to 40 MPa, increasing by 31.3% in comparison to the neat PVC. Such a significant Mechanical Reinforcement was mainly attributed to uniform dispersion of the large-size MLG, good compatibility and strong interactions among MLG and plasticizers and PVC.
You Zeng - One of the best experts on this subject based on the ideXlab platform.
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Mechanical Reinforcement of graphene poly vinyl chloride composites prepared by combining the in situ suspension polymerization and melt mixing methods
Composites Part B-engineering, 2017Co-Authors: Han Wang, Zhe Ying, Yu Tong, Minghe Fang, You ZengAbstract:Abstract In order to obtain uniform dispersion of graphene and significant Mechanical Reinforcement of graphene filled poly(vinyl chloride) (PVC) composites, we used in-situ suspension polymerization to obtain graphene/PVC compounded resins with uniform dispersion of graphene, and subsequently prepared graphene/PVC composites using conventional melt-mixing technique. The microstructure, graphene dispersion, Mechanical and thermal properties of the nanocomposites were investigated in detail. We found that the combination of in-situ polymerization and melt-mixing was effective in obtaining graphene/PVC composites with uniform graphene dispersion and significant Mechanical Reinforcement. The tensile strength, impact toughness, and thermal stability of the nanocomposites were greatly improved even at an extremely low graphene loading (0.3 wt%), which is mainly attributed to the uniform dispersion of graphene and strong graphene-PVC interactions. By virtue of their excellent Mechanical properties and easy production, the graphene/PVC composites have great potential to be used as high-performance composites in many fields.
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enhanced Mechanical properties of multi layer graphene filled poly vinyl chloride composite films
Journal of Materials Science & Technology, 2015Co-Authors: Guiyuan Xie, Han Wang, Zhe Ying, Yu Tong, You ZengAbstract:In order to improve Mechanical properties of soft poly(vinyl chloride) (PVC) films, we used commercial multi-layer graphene (MLG) with large size and high structural integrity as reinforcing fillers, and prepared MLG/PVC composite films by using conventional melt-mixing methods. Microstructures, static and dynamic Mechanical properties of the MLG/PVC composite films were investigated. The results showed that a small amount of MLG loading could greatly increase the Mechanical properties of the MLG/PVC composites. The tensile modulus of the 0.96 wt% MLG/PVC composites was up to 40 MPa, increasing by 31.3% in comparison to the neat PVC. Such a significant Mechanical Reinforcement was mainly attributed to uniform dispersion of the large-size MLG, good compatibility and strong interactions among MLG and plasticizers and PVC.
Canzhong He - One of the best experts on this subject based on the ideXlab platform.
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molecular level dispersion of graphene into epoxidized natural rubber morphology interfacial interaction and Mechanical Reinforcement
Polymer, 2014Co-Authors: Canzhong He, Zheng Peng, Lingxue KongAbstract:The interfacial interaction of composites dominates the properties of polymeric/inorganic nanocomposites. Herein, epoxy and hydroxyl groups are introduced into the natural rubber (NR) molecular chains to anchor oxygenous functional groups on the surface of graphene oxide (GO) sheets and therefore enhance the interfacial interaction between GO and rubber. From the morphological observation and interaction analysis, it is found that epoxidized natural rubber (ENR) latex particles are assembled onto the surfaces of GO sheets by employing hydrogen bonding interaction as driving force. This self-assembly depresses restacking and agglomeration of GO sheets and leads to homogenous dispersion of GO within ENR matrix. The formation of hydrogen bonding interface between ENR and GO demonstrates a significant Reinforcement for the ENR host. Compared with those of pure ENR, the composite with 0.7 wt% GO loading receives 87% increase in tensile strength and 8.7 fold increase in modulus at 200% elongation after static in-situ vulcanization.
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molecular level dispersion of graphene into epoxidized natural rubber morphology interfacial interaction and Mechanical Reinforcement
Polymer, 2014Co-Authors: Canzhong He, Zheng Peng, Lingxue KongAbstract:The interfacial interaction of composites dominates the properties of polymeric/inorganic nanocomposites. Herein, epoxy and hydroxyl groups are introduced into the natural rubber (NR) molecular chains to anchor oxygenous functional groups on the surface of graphene oxide (GO) sheets and therefore enhance the interfacial interaction between GO and rubber. From the morphological observation and interaction analysis, it is found that epoxidized natural rubber (ENR) latex particles are assembled onto the surfaces of GO sheets by employing hydrogen bonding interaction as driving force. This self-assembly depresses restacking and agglomeration of GO sheets and leads to homogenous dispersion of GO within ENR matrix. The formation of hydrogen bonding interface between ENR and GO demonstrates a significant Reinforcement for the ENR host. Compared with those of pure ENR, the composite with 0.7 wt% GO loading receives 87% increase in tensile strength and 8.7 fold increase in modulus at 200% elongation after static in-situ vulcanization.
Jacques Jestin - One of the best experts on this subject based on the ideXlab platform.
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nanofiller structure and Reinforcement in model silica rubber composites a quantitative correlation driven by interfacial agents
Macromolecules, 2014Co-Authors: Adrien Bouty, Francois Boue, Laurent Petitjean, Christophe Degrandcourt, Jeremie Gummel, Pawel Kwaśniewski, Florian Meneau, Marc Couty, Jacques JestinAbstract:We report a complete analysis of model silica/styrene–butadiene rubber (SBR) nanocomposites including a direct and quantitative correlation between the filler structure and the Mechanical Reinforcement. We compared two different ways of sample processing: a solvent casting route with well-defined colloidal silica and the manufacturing process of internal mixing with industrial silica powder. The multiscale filler dispersion was characterized with a combination of SAXS/TEM in both reciprocal and direct space. The Mechanical properties were determined with oscillatory shear measurements. We evaluated the influence of two polymer-filler interfacial additives on the filler dispersion: a coating agent and a coupling agent for different particle concentrations. Using simple analytical functions, we succeed in modeling the filler dispersion. We obtained surprisingly the same general trend whatever the sample processing, solvent casting, or internal mixing. The primary particles form fractal primary aggregates in...
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multiscale characterization of filler dispersion and origins of Mechanical Reinforcement in model nanocomposites
Polymer, 2012Co-Authors: Nicolas Jouault, Florent Dalmas, Francois Boue, Jacques JestinAbstract:Abstract We report on the influence of parameters controlling filler dispersion and Mechanical Reinforcement in model nanocomposites. We elaborate a series of nanocomposites and present a structural characterization of silica dispersion in polymer matrix for several particle sizes and polymer matrices, at all relevant scales, by coupling Small Angle X-ray Scattering and Transmission Electronic Microscopy. The Mechanical properties are investigated in the linear regime by coupling Dynamical Mechanical Analysis and plate/plate rheology. The results show that: (i) for all filler sizes and matrices, a structural transition is observed from non-connected fractal aggregates at low silica concentration to connected network at high particle content. (ii) In the dilute regime, the Reinforcement implies a polymer chain contribution with different possible origins: increase of entanglements density for PS and increase of friction coefficient for PMMA. (iii) In the concentrated regime, for a given polymer, the Reinforcement amplitude can be tuned by the rigidity of the filler network, which directly depends on the particle–particle interaction.
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direct small angle neutron scattering observation of stretched chain conformation in nanocomposites more insight on polymer contributions in Mechanical Reinforcement
Physical Review E, 2010Co-Authors: Nicolas Jouault, Sylvere Said, Emanuela Di Cola, Florent Dalmas, Jacques Jestin, Ralf Schweins, Francois BoueAbstract:In this paper we present a direct measurement of stretched chain conformation in polymer nanocomposites in a large range of deformation using a specific contrast-matched SANS method. Whatever the filler structure and the chain length the results show a clear identity of chain deformation in pure and reinforced polymer and offer a new insight of the polymer chain contribution in the Mechanical Reinforcement. It suggests that glassy layer or glassy paths, recently proposed, should involve only a small fraction of chains. As a result, the remaining filler contribution appears strikingly constant with deformation as explained by continuous locking-unlocking rearrangement process of the particles.
Lingxue Kong - One of the best experts on this subject based on the ideXlab platform.
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molecular level dispersion of graphene into epoxidized natural rubber morphology interfacial interaction and Mechanical Reinforcement
Polymer, 2014Co-Authors: Canzhong He, Zheng Peng, Lingxue KongAbstract:The interfacial interaction of composites dominates the properties of polymeric/inorganic nanocomposites. Herein, epoxy and hydroxyl groups are introduced into the natural rubber (NR) molecular chains to anchor oxygenous functional groups on the surface of graphene oxide (GO) sheets and therefore enhance the interfacial interaction between GO and rubber. From the morphological observation and interaction analysis, it is found that epoxidized natural rubber (ENR) latex particles are assembled onto the surfaces of GO sheets by employing hydrogen bonding interaction as driving force. This self-assembly depresses restacking and agglomeration of GO sheets and leads to homogenous dispersion of GO within ENR matrix. The formation of hydrogen bonding interface between ENR and GO demonstrates a significant Reinforcement for the ENR host. Compared with those of pure ENR, the composite with 0.7 wt% GO loading receives 87% increase in tensile strength and 8.7 fold increase in modulus at 200% elongation after static in-situ vulcanization.
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molecular level dispersion of graphene into epoxidized natural rubber morphology interfacial interaction and Mechanical Reinforcement
Polymer, 2014Co-Authors: Canzhong He, Zheng Peng, Lingxue KongAbstract:The interfacial interaction of composites dominates the properties of polymeric/inorganic nanocomposites. Herein, epoxy and hydroxyl groups are introduced into the natural rubber (NR) molecular chains to anchor oxygenous functional groups on the surface of graphene oxide (GO) sheets and therefore enhance the interfacial interaction between GO and rubber. From the morphological observation and interaction analysis, it is found that epoxidized natural rubber (ENR) latex particles are assembled onto the surfaces of GO sheets by employing hydrogen bonding interaction as driving force. This self-assembly depresses restacking and agglomeration of GO sheets and leads to homogenous dispersion of GO within ENR matrix. The formation of hydrogen bonding interface between ENR and GO demonstrates a significant Reinforcement for the ENR host. Compared with those of pure ENR, the composite with 0.7 wt% GO loading receives 87% increase in tensile strength and 8.7 fold increase in modulus at 200% elongation after static in-situ vulcanization.