文献类型：期刊文献

英文题名：Microcellular injection molding of polypropylene and glass fiber composites with supercritical nitrogen

作者：Xi, Zhenhao[1];Sha, Xinyi[1];Liu, Tao[1];Zhao, Ling[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2014

卷号：50

期号：5

起止页码：489

外文期刊名：JOURNAL OF CELLULAR PLASTICS

收录：;EI(收录号：20143618138476);WOS:【SCI-EXPANDED(收录号:WOS:000341372900005)】；

基金：This research was supported by the National Programs for High Technology Research and Development of China (863 Project, 2012AA040211), the National Natural Science Foundation of China (Grant No. 21306043), the Research Fund for the Doctoral Program of Higher Education of China (20120074120019 and 20130074110013), the Joint Research Project of Yangtze River Delta (12195810900) and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Microcellular injection molding; polypropylene-glass fiber composites; microstructure; mechanical properties; supercritical nitrogen

摘要：Microcellular injection molding of polypropylene and glass fiber composites (PP-1684/GF-950) was performed using supercritical nitrogen as the physical blowing agent. Based on design of experiment matrices, the influences of glass fiber content and operating conditions on cell structure, glass fiber orientation and mechanical properties of molded samples were studied systematically. The results showed the cell morphology and glass fiber orientation of foaming parts were definitely influenced by the cooling and shear effects. The mechanical properties of foamed polypropylene-glass fiber composites could be effectively enhanced by improving the cell morphology, dispersion state and orientation of the glass fiber at optimal weight percentage w(GF)/w(PP) = 11.8%. And the optimal conditions for injection molding were obtained by analyzing the signal-to-noise ratio analysis of the mechanical properties of the molded samples, which were a shot size of 36 mm, a supercritical N-2 weight percentage of 0.4%, an injection speed of 60%, a melt temperature of 190 degrees C and a mold temperature of 70 degrees C. The molded specimens of polypropylene-glass fiber composites, produced under those optimal conditions, exhibited very uniform fiber dispersion and microcellular structures with an average cell size less than 30 mu m. And the mechanical properties normalized by weight ratio of the microcellular samples were increased significantly, especially the impact strength.