文献类型：期刊文献

英文题名：Preparation and foaming mechanism of foamable polypropylene based on self-assembled nanofibrils from sorbitol nucleating agents

作者：Wang, Weixia[1];Zhou, Shuai[1];Xin, Zhong[1,2];Shi, Yaoqi[1,3];Zhao, Shicheng[1];Meng, Xin[1]

机构：[1]E China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[3]Shanghai Res Inst Chem Ind, Shanghai Key Lab Catalysis Technol Polyolefin, Shanghai 200062, Peoples R China

年份：2016

卷号：51

期号：2

起止页码：788

外文期刊名：JOURNAL OF MATERIALS SCIENCE

收录：;EI(收录号：20153801277257);WOS:【SCI-EXPANDED(收录号:WOS:000365263900014)】；

基金：This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 21476085 and 21306047), the financial support of Ministry of Science and Technology of People's Republic of China (The people's Republic of China 863 Program, Grant Nos. 2015AA034003), and the Fundamental Research Funds for the Central Universities of China (Grant Nos. 22A201514016 and 222201314051).

语种：英文

外文关键词：Alcohols - Nanofibers

摘要：A strategy to prepare foamable isotactic polypropylene (iPP) was proposed by introducing crystal nucleating agent, 1,3:2,4-bis(p-methylbenzylidene) sorbitol (S20), and the foaming mechanism was also investigated. When a proper concentration (above 0.3 wt%) of S20 was added, iPP/S20 exhibited excellent foaming performance, yielding uniform cells with well-defined structures and higher cell density than those of neat iPP. The results of rheological analysis and TEM confirmed the formation of S20 nanofibrils in iPP matrix. The existence of these nanofibrils increased the melt viscosity of iPP and enhanced the bubble nucleation in the foaming process, and thus should be responsible for the improved foaming ability of iPP. Moreover, iPP/S20 could be foamed in a remarkably wide temperature range from 143 to 163 A degrees C. In comparison, another crystal nucleating agent, sodium 2,2'-methylene-bis-(4,6-di-tert-butylphenyl)-phosphate (NA40), contributed little to the foamability of iPP although it also induced the crystallization of iPP.