文献类型：期刊文献

英文题名：Experiment and simulation of foaming injection molding of polypropylene/nano-calcium carbonate composites by supercritical carbon dioxide

作者：Xi, Zhenhao[1,2]; Chen, Jie[1,2]; Liu, Tao[1]; Zhao, Ling[1]; Turng, Lih-Sheng[2]

机构：[1] State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] Department of Mechanical Engineering, University of Wisconsin-Madison, WI, 53706, United States

年份：2016

卷号：24

期号：1

起止页码：180

外文期刊名：Chinese Journal of Chemical Engineering

收录：EI(收录号：20155201737092)

基金：Supported by the National High Technology Research and Development Program of China ( 2012AA040211 ), the National Natural Science Foundation of China ( 21306043 ), the Research Fund for the Doctoral Program of Higher Education of China ( 20120074120019 , 20130074110013 ), and the Fundamental Research Funds for the Central Universities .

语种：英文

外文关键词：Injection molding - Carbon dioxide - Fillers - Carbonation - Microcellular radio systems - Nucleation - Activation energy - Blowing agents - Supercritical fluid extraction - Polypropylenes - Plastic products

摘要：Microcellular injection molding of neat isotactic polypropylene (iPP) and isotactic polypropylene/nano-calcium carbonate composites (iPP/nano-CaCO3) was performed using supercritical carbon dioxide as the physical blowing agent. The influences of filler content and operating conditions on microstructure morphology of iPP and iPP/nano-CaCO3 microcellular samples were studied systematically. The results showed the bubble size of the microcellular samples could be effectively decreased while the cell density increased for iPP/nano-CaCO3 composites, especially at high CO2 concentration and back pressure, low mold temperature and injection speed, and high filler content. Then Moldex 3D was applied to simulate the microcellular injection molding process, with the application of the measured ScCO2 solubility and diffusion data for iPP and iPP/nano-CaCO3 composites respectively. For neat iPP, the simulated bubble size and density distribution in the center section of tensile bars showed a good agreement with the experimental values. However, for iPP/nano-CaCO3 composites, the correction factor for nucleation activation energy F and the pre-exponential factor of nucleation rate f0 were obtained by nonlinear regression on the experimental bubble size and density distribution. The parameters F and f0 can be used to predict the microcellular injection molding process for iPP/nano-CaCO3 composites by Moldex 3D. ? 2015 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved.