Shemao Wu
Beijing University of Chemical Technology
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Publication
Featured researches published by Shemao Wu.
RSC Advances | 2016
Nanying Ning; Yueqing Hua; Hanguang Wu; Liqun Zhang; Shemao Wu; Ming Tian; Hongchi Tian; Guo-Hua Hu
Thermoplastic vulcanizates (TPVs) combine the excellent elasticity of conventional vulcanized rubbers and the easy processability and recyclability of thermoplastics. In this study, we successfully prepared novel heat and oil-resistant TPVs based on ethylene-vinyl acetate rubber (EVM) and poly(vinylidene fluoride) (PVDF) by dynamic vulcanization (DV). The phase morphology, morphological evolution, and the properties of the EVM/PVDF TPVs were studied, and the microstructure–property relationship during DV was revealed. Interestingly, a large number of EVM rubber nanoparticles are observed in the EVM/PVDF TPVs during DV, and these nanoparticles assemble into oriented EVM fibers and EVM bundles during DV. As the DV further proceeds, the oriented EVM fibers and EVM bundles agglomerate with one another more densely and further assemble into EVM spherulites, leading to an increase in the thickness of the PVDF ligaments and the deterioration of the rubber network. More importantly, our EVM/PVDF TPVs show good mechanical properties, high elasticity, good processability, excellent heat-and oil resistance, and good recyclability. This study provides guidance for the preparation of new TPVs that can replace the traditional thermosetting rubbers in automotive and oil pipeline areas.
Materials Research Innovations | 2015
Xiu Juan Wang; Xiuying Zhao; Dawei Yang; Shemao Wu
Abstract The influence of structure of poly(bisphenol-A carbonate) on property was systematically studied by both experiment and molecular dynamic simulation. At the molecular level, it was observed that copolymerisation of dichlorodimethylsilane did not improve the thermal stability and optical property, through 13C-nuclear magnetic resonance. Molecular simulation has good agreement with experimental results on density, half decomposition temperature (T1/2), glass transition temperature (Tg), refraction index, flow activation energy and mechanical performance. The molecular dynamics results demonstrated the feasibility of molecular simulation technique in designing materials at the molecular scale, and had advantage in improving our understanding of material’ performance and pressure–volume–temperature characteristics. The pressure–volume–temperature dependences of different microstructure amorphous were characterised to optimise the processing parameters, and to obtain accurate prediction of materials property. The empirical Tait equation of state well described the pressure–volume–temperature dependence of amorphous liquids.
Materials Research Innovations | 2015
W. Zheng; Shemao Wu; Y. P. Wu; Jingwei He; Y. L. Luo
Abstract Three-dimensional periodic molecular models of amorphous cis-1,4-polybutadiene (cis-PBD) were constructed using the Materials Studio (MS)® software to study the effects of temperature on the diffusion of oxygen (O2). The radial distribution function, solubility parameter and others clearly proved the three-dimensional periodic molecular model was able to reproduce bulk experimental data of the authentic materials. The volume fraction of accessible oxygen was reckoned by fractional free volume with a probe radius of 1.8 Å. The diffusion coefficients (D) of O2 were calculated, and researches on the diffusion mechanism were made. Data obtained corresponded with the trend from available experiments and previously published simulation work. The results confirmed the accelerating effect of high temperatures on the diffusion of O2 and meanwhile suggested the favourable binding sites of thermo-oxidative aging reactions. Our findings have an important significance for promoting the development of membrane separation technology and provide valuable guidance for further research on thermo-oxidative aging of cis-PBD.
Archive | 2011
Liqun Zhang; Yi Liu; Guichang Cao; Xiaoxi Huang; Xiaolin Li; Lixin Mao; Shemao Wu
Composites Science and Technology | 2015
Nanying Ning; Lianjie Ji; Liqun Zhang; Jun Liu; Yonglai Lu; Shemao Wu; Hua Zou; Ming Tian; Tung W. Chan
Archive | 2011
Youyong Ge; Guoqiang Dai; Li Liu; Shemao Wu; Xiaolin Li; Liqun Zhang; Shijun Wang
Archive | 2010
Guoqiang Dai; Ming Tian; Shijun Wang; Shemao Wu; Xiuzuo Yao; Liqun Zhang; Hua Zou
Archive | 2007
Liqun Zhang; Hongchi Tian; Xiaoning Yu; Yongcun Mi; Shemao Wu
Archive | 2009
Liqun Zhang; Hongchi Tian; Wenquan Chen; Xiaoning Yu; Shemao Wu; Jibin Han
Archive | 2011
Ming Tian; Shi Yin; Liqun Zhang; Hua Zou; Shemao Wu