文献类型：期刊文献

英文题名：Effect of crystallization on tensile mechanical properties of PET foam: Experiment and model prediction

作者：Yao, Shun[1];Hu, Dongdong[1];Xi, Zhenhao[1];Liu, Tao[1];Xu, Zhimei[1];Zhao, Ling[1,2]

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

年份：2020

卷号：90

外文期刊名：POLYMER TESTING

收录：;EI(收录号：20202708884341);WOS:【SCI-EXPANDED(收录号:WOS:000567859800044)】；

基金：The authors are grateful to National Key Research and Development Program of China (2016YFB0302200) and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：PET foam; Supercritical CO2 extrusion foaming; Tensile mechanical performance

摘要：Currently Polyethylene terephthalate (PET) foam is the most promising structural core materials, and the tensile mechanical properties are one of its important application indicators. Herein, environmental-friendly supercritical CO2 (ScCO2) extrusion foaming was adopted to prepare PET foam. Aiming at investigating the influence of crystals on the mechanical properties, isothermal treatment in the post-process was used to improve the crystallization process of PET foams. Due to the crystal perfection proceeds via migration and rejection of the structural defects at the crystallites induced by slow crystallization, the crystallinity increased rapidly with the rise of isothermal temperature, especially above the glass transition temperature (T-g). Qualitatively, it can be concluded that the crystalline phase contents have an intimate positive correlation with the tensile modulus, meanwhile, the shape ratio of the crystal have no significant effects on the tensile modulus. In addition, a coupling scheme of aggregate two-layered composite inclusion model and Simone-Gibson equation was first proposed to quantify the mathematical relationship between crystallization and tensile modulus of PET foam, which realized basic agreement.