文献类型：期刊文献

英文题名：Microcellular PETs with High Expansion Ratio Produced by Supercritical CO2 Molding Compression Foaming Process and Their Mechanical Properties

作者：Chen, Yichong[1];Yao, Shun[1];Ling, Yijie[1];Zhong, Wenyu[1];Hu, Dongdong[1];Zhao, Ling[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Xinjiang Univ, Coll Chem Engn & Technol, Urumqi 830046, Peoples R China

年份：2022

卷号：24

期号：3

外文期刊名：ADVANCED ENGINEERING MATERIALS

收录：;EI(收录号：20220411538004);WOS:【SCI-EXPANDED(收录号:WOS:000745999500001)】；

基金：This work was supported by the National Key Research and Development Program of China (grant no. 2016YFB0302200), the Fundamental Research Funds for the Central Universities (grant no. JKA012011002), and the 111 Project (grant no. B20031).

语种：英文

外文关键词：compression performance; microcellular polyethylene terephthalate; molding compression foaming process; supercritical CO2; viscoelasticity

摘要：Supercritical CO2 molding compression foaming is an emerging technology for preparing thick microcellular polymer sheets. In a temperature range of 245-255 degrees C and CO2 foaming pressure range of 5-20 MPa, the molding compression foaming behavior of polyethylene terephthalate (PET) is systematically studied. The maximum expansion ratio of the prepared PET foams is above 30, while the bubble size is only approximate to 20 mu m. It is observed that during the foaming process, the temperature drop caused by rapid depressurization reaches up to 57 degrees C, which greatly changes the viscoelasticity of PET and limits its foaming behavior. The nucleation and bubble growth behavior of PET is simulated and analyzed based on this change in viscoelasticity. Microcellular PET foams have excellent compression performance due to their smaller cell size and thinner cell wall, and the compression elastic modulus of the prepared microcellular PET sample is twice that of the extrusion foaming PET sample with a similar expansion ratio.