文献类型：期刊文献

英文题名：Solid state foaming of poly(ethylene terephthalate) based on periodical CO2-renewing sorption process

作者：Xia, Tian[1];Xi, Zhenhao[1];Liu, Tao[1,2];Zhao, Ling[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China

年份：2017

卷号：168

起止页码：124

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20171803635488);WOS:【SCI-EXPANDED(收录号:WOS:000404492300011)】；

基金：This work was supported by The National Key Research and Development Program of China [2016YFB0302201] and the Shanghai Excellent Technical Leaders Program [14XD1425500].

语种：英文

外文关键词：Solid state foaming; Poly(ethylene terephthalate); Periodical CO2-renewing sorption; Annealing

摘要：The periodical CO2-renewing sorption process was applied in the solid state foaming of poly(ethylene terephthalate) (PET), in order to decrease the sorption time, increase the concentration of CO2 in PET matrix, and ultimately increase the expansion ratio of PET foams. The cell nucleation and growth were initiated after every depressurization in the sorption process, and the concentration of the dissolved CO2 was reduced by the consumption of cells nucleation and cells formation, which inhibited CO(2)induced crystallization. As a result, the CO2 concentration of 150-160 mg/g PET was obtained, which was much higher than the reported CO2 solubility in PET matrix (similar to 110 mg/g PET). With different sorption temperatures and CO2-renewing periods, PET foams with the cell size between 5 and 22 gm, the cell density between 2.42 x 10(8) and 2.93 x 10(9) cells/cm(3), and the expansion ratio between 3 and 6 times were controllably prepared. Only 1 h was required to enhance the crystallinity of PET foams to about 30% by the means of annealing treatment at 110-130 degrees C. And the cell morphology was still well kept during the annealing process. (C) 2017 Elsevier Ltd. All rights reserved.