文献类型：期刊文献

英文题名：Controlling sandwich-structure of PET microcellular foams using coupling of CO₂ diffusion and induced crystallization

作者：Li, Dachao[1];Liu, Tao[1];Zhao, Ling[1];Yuan, Weikang[1]

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

年份：2012

卷号：58

期号：8

起止页码：2512

外文期刊名：AICHE JOURNAL

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000306122400020)】；

基金：The authors are grateful to the National Natural Science Foundation of China (Grant No. 20976045 and 20976046), Shanghai Shuguang Project (08SG28), Program for New Century Excellent Talents in University (NCET-09-0348), Innovation Program of Shanghai Municipal Education Commission (11CXY23), Program for Changjiang Scholars and Innovative Research Team in University (IRT0721), the 111 Project (B08021), and the support of "the Fundamental Research Funds for the Central Universities."

语种：英文

外文关键词：PET microcellular foams; CO2 diffusion; CO2-induced crystallization; coupling; sandwich-structure

摘要：Controlling sandwich-structure of poly(ethylene terephthalate) (PET) microcellular foams using coupling of CO2 diffusion and CO2-induced crystallization is presented in this article. The intrinsic kinetics of CO2-induced crystallization of amorphous PET at 25 degrees C and different CO2 pressures were detected using in situ high-pressure Fourier transform infrared spectroscopy and correlated by Avrami equation. Sorption of CO2 in PET was measured using magnetic suspension balance and the diffusivity determined by Fick's second law. A model coupling CO2 diffusion in and CO2-induced crystallization of PET was proposed to calculate the CO2 concentration as well as crystallinity distributions in PET sheet at different saturation times. It was revealed that a sandwich crystallization structure could be built in PET sheet, based on which a solid-state foaming process was used to manipulate the sandwich-structure of PET microcellular foams with two microcellular or even ultra-microcellular foamed crystalline layers outside and a microcellular foamed amorphous layer inside. (C) 2011 American Institute of Chemical Engineers AIChE J, 58: 2512-2523, 2012