文献类型：期刊文献

英文题名：Melt foamability of reactive extrusion-modified poly(ethylene terephthalate) with pyromellitic dianhydride using supercritical carbon dioxide as blowing agent

作者：Xia, Tian[1];Xi, Zhenhao[1];Liu, Tao[1];Pan, Xun[1];Fan, Chaoyang[1];Zhao, Ling[1]

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

年份：2015

卷号：55

期号：7

起止页码：1528

外文期刊名：POLYMER ENGINEERING AND SCIENCE

收录：;EI(收录号：20143600035072);WOS:【SCI-EXPANDED(收录号:WOS:000356515600007)】；

基金：Contract grant sponsor: National Natural Science Foundation of China; contract grant number: 21176070; Contract grant sponsor: National Programs for High Technology Research and Development of China (863 Project); contract grant number: 2012AA040211; Contract grant sponsor: the joint research project for Yangtze River Delta; contract grant sponsor: Doctoral Program of Higher Education of China; contract grant number: 20120074120019; Contract grant sponsor: Fundamental Reasarch Funds for the Central Universities; contract grant sponsor: 111 Project; contract grant number: B08021.

语种：英文

外文关键词：Blowing agents - Carbon dioxide - Cells - Cytology - Ethylene - Extrusion - Supercritical fluid extraction

摘要：By reactive extrusion with pyromellitic dianhydride (PMDA), foamable poly(ethylene terephthalate) (PET) was obtained, which achieved a maximum intrinsic viscosity of 1.36 dL/g with PMDA content 0.8 wt%. Dynamic shear rheological properties were measured to characterize the structure evolution of modified PET. And the Avrami analysis was extended for the non-isothermal crystallization process of modified PET, which relates to cell stabilization in the melt foaming process. Based on the batch foaming process with supercritical carbon dioxide as blowing agent, broad foaming temperature windows were obtained for PETs modified with 0.8 and 0.5 wt% PMDA, in which PET foams with the expansion ratio between 10 and 50 times, the cell diameter between 15 and 37 m, and the cell density between 6.2 x 10(8) and 1.6 x 10(9) cells/cm(3) were controllably produced. POLYM. ENG. SCI., 55:1528-1535, 2015. (c) 2014 Society of Plastics Engineers