聚酰亚胺的气体渗透性：解析自由体积、链段间距和玻璃化转变温度的影响

Gas Permeability through Polyimides: Unraveling the Influence of Free Volume, Intersegmental Distance and Glass Transition Temperature.

作者信息

Torres Alba, Soto Cenit, Carmona Javier, Comesaña-Gandara Bibiana, de la Viuda Mónica, Palacio Laura, Prádanos Pedro, Simorte María Teresa, Sanz Inmaculada, Muñoz Raúl, Tena Alberto, Hernández Antonio

机构信息

Surface and Porous Materials (SMAP), Associated Research Unit to CSIC, Facultad de Ciencias, Universidad de Valladolid, Paseo Belén 7, E-47011 Valladolid, Spain.

Institute of Sustainable Processes (ISP), Dr. Mergelina s/n, E-47011 Valladolid, Spain.

出版信息

Polymers (Basel). 2023 Dec 19;16(1):13. doi: 10.3390/polym16010013.

DOI:10.3390/polym16010013

PMID:38201678

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10780579/

Abstract

The relationships between gas permeability and free volume fraction, intersegmental distance, and glass transition temperature, are investigated. They are analyzed for He, CO, O, CH, and N gases and for five similar polyimides with a wide range of permeabilities, from very low to extremely high ones. It has been established here that there is an exponential relationship between permeability and the free volume fraction, and between permeability and the most probable intersegmental distance as measured by WAXS; in both cases, with an exponential coefficient that depends on the kinetic gas diameter as a quadratic polynomial and with a preexponential positive constant. Moreover, it has been proven that the intersegmental distance increases linearly with the free volume fraction. Finally, it has been established that the free volume fraction increases with the glass transition temperature for the polymers tested, and that they depend on each other in an approximate linear way.

摘要

研究了气体渗透率与自由体积分数、链段间距离和玻璃化转变温度之间的关系。对氦气、一氧化碳、氧气、甲烷和氮气以及五种渗透率范围很广（从极低到极高）的类似聚酰亚胺进行了分析。已确定渗透率与自由体积分数之间以及渗透率与通过广角X射线散射测量的最可能链段间距离之间存在指数关系；在这两种情况下，指数系数均为取决于动力学气体直径的二次多项式，且存在一个指数前的正常数。此外，已证明链段间距离随自由体积分数呈线性增加。最后，已确定在所测试的聚合物中，自由体积分数随玻璃化转变温度升高，且它们之间以近似线性方式相互依赖。