文献类型：期刊文献

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

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

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

机构：[1]State Key Laboratory of Chemical Engineering, East China University of Science and Technology;[2]Department of Mechanical Engineering, University of Wisconsin–Madison

年份：2016

卷号：24

期号：1

起止页码：180

中文期刊名：Chinese Journal of Chemical Engineering

外文期刊名：中国化学工程学报（英文版）

收录：CSTPCD;;Scopus;CSCD:【CSCD2015_2016】；

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);the Fundamental Research Funds for the Central Universities

语种：英文

中文关键词：Microcellular injection molding Isotactic polypropylene/nano-calcium carbonate Cell morphology Nucleation activation energy Numerical simulation

外文关键词：PP复合材料;超临界二氧化碳;发泡聚丙烯;纳米碳酸钙;实验值;发泡成型;模拟;注射成型工艺

摘要：Microcellular injection molding of neat isotactic polypropylene(iPP) and isotactic polypropylene/nano-calcium carbonate composites(i PP/nano-CaCO_3) was performed using supercritical carbon dioxide as the physical blowing agent. The influences of filler content and operating conditions on microstructure morphology of i PP and i PP/nano-CaCO_3 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 i PP/nano-CaCO_3 composites, especially at high CO_2 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 ScCO_2 solubility and diffusion data for i PP and i PP/nano-Ca CO_3 composites respectively. For neat i PP, the simulated bubble size and density distribution in the center section of tensile bars showed a good agreement with the experimental values. However, for i PP/nano-CaCO_3 composites, the correction factor for nucleation activation energy F and the pre-exponential factor of nucleation rate f_0 were obtained by nonlinear regression on the experimental bubble size and density distribution. The parameters F and f_0 can be used to predict the microcellular injection molding process for i PP/nano-CaCO_3 composites by Moldex 3D.
Microcellular injection molding of neat isotactic polypropylene（iPP） and isotactic polypropylene/nano-calcium carbonate composites（i PP/nano-CaCO_3） was performed using supercritical carbon dioxide as the physical blowing agent. The influences of filler content and operating conditions on microstructure morphology of i PP and i PP/nano-CaCO_3 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 i PP/nano-CaCO_3 composites, especially at high CO_2 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 ScCO_2 solubility and diffusion data for i PP and i PP/nano-Ca CO_3 composites respectively. For neat i PP, the simulated bubble size and density distribution in the center section of tensile bars showed a good agreement with the experimental values. However, for i PP/nano-CaCO_3 composites, the correction factor for nucleation activation energy F and the pre-exponential factor of nucleation rate f_0 were obtained by nonlinear regression on the experimental bubble size and density distribution. The parameters F and f_0 can be used to predict the microcellular injection molding process for i PP/nano-CaCO_3 composites by Moldex 3D.