文献类型：期刊文献

英文题名：Effect of Chain Composition of Pbat on the Supercritical Co2 Foaming and the Degradation Behavior

作者：Zhang, Jiaming[1]; Hu, Dongdong[2]; Wei, Shaolong[2]; Xi, Zhenhao[2]; Zhen, Weijun[1]; Zhao, Ling[1,2]

机构：[1] College of Chemical Engineering and Technology, Xinjiang University, Urumqi, 830046, China; [2] State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2023

外文期刊名：SSRN

收录：EI(收录号：20230034329)

语种：英文

外文关键词：Biodegradability - Biodegradable polymers - Blowing agents - Butenes - Crystallinity - Foams - Molecular weight - Polymer melts - Shrinkage - Stability - Supercritical fluid extraction

摘要：Poly (butylene adipate-co-butylene terephthalate) copolyester (PBAT) with different copolymer compositions and molecular weight exhibits quite distinctive foaming behaviors and dimensional stability using supercritical CO2 as blowing agent. As the butylene glycol terephthalate (BT) segment content increases from 43% to 61%, the melting point and crystallinity of PBAT increase, resulting that the foaming window of PBAT moves to a narrow higher temperature zone from 70-120 ℃ to 135-160 ℃ under 13 MPa CO2 pressure. As the BT segment content increases, the solubility of CO2 in PBAT and the rate of CO2 desorption rate decrease. And PBAT has a higher compression modulus, so that PBAT foam has better dimensional stability. The molecular weight of PBAT has little effect on the crystallization, CO2 diffusion behavior and foam dimensional stability of PBAT at similar BT segment content. Only the foaming window becomes wider and cell density increases owing to higher polymer melt strength. It is worth noting that the appropriately increased BT segment content of PBAT can not only ensure the good dimensional stability of PBAT foam has, but also maintain the good biodegradability of PBAT to some extent. Moreover, the influence of PBAT foam structure on its degradation behavior was explored. The foam materials with higher volume expansion ratio, larger cell size and the lower the cell density degrade faster. ? 2023, The Authors. All rights reserved.