Preparation and characterization of highly heat-resistant, soluble, and hydrophobic fluorinated polyimides with gas transport properties

IF 1.8 4区化学 Q3 POLYMER SCIENCE

High Performance Polymers Pub Date : 2024-03-06 DOI:10.1177/09540083241237751

Yufei Shi, Jinling Li, Weilian Wu, Jing Ni, Bowen Wei, Chanjuan Liu, Xiaohua Huang

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引用次数: 0

Abstract

A series of fluorinated co-polyimide films based on the 6FDA-FTPPA/BAFL backbone were prepared from 4-(3-fluoro-4-(trifluoromethyl)phenyl)-2,6-bis(4-aminophenyl)pyridine (FTPPA),commercial 9,9-bis(4-aminophenyl)fluorene (BAFL), and 4,4’-(hexafluoroisopropylidene)diphthalic anhydride (6FDA), with varying ratios of FTPPA:BAFL units (3:1, 2:1, 1:1, 1:2, and 1:3). Co-polyimides not only exhibit high thermal stability ( Tg > 357°C), good optical properties (λcutoff > 327 nm) and hydrophobicity (contact angle >91.4°), but also favorable solubility properties in both high and low boiling organic solvents. The fractional free volume of the polymers was simulated using molecular mechanics and molecular dynamics and correlated with experimental gas separation data. The presence of bulky groups led to high FFVs (>17.8%) and the formation of large microcavities with diameters ranging from 5.48 to 5.72 Å, which efficiently increased gas permeability. In pure gas permeation experiments, the permeability coefficients of CO2 and He for the 6FDA-FTPPA/BAFL (3:1) film were 41.48 and 79.38 bar, respectively, which were superior to those of commercial Matrimid and Kapton in terms of gas permeability. In especial, the 6FDA-FTPPA/BAFL (1:2) and 6FDA-FTPPA/BAFL (1:3) in co-polyimide membranes exhibited the most attractive separation performance for O2/N2 gas pairs, approaching the 1991 Roberson upper limit.

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制备和表征具有气体传输特性的高耐热性、可溶性和疏水性氟化聚酰亚胺

研究人员以 4-(3-氟-4-(三氟甲基)苯基)-2,6-双(4-氨基苯基)吡啶 (FTPPA)、商用 9,9-双(4-氨基苯基)芴 (BAFL) 和 4,4'-(六氟异丙亚基)二酞酸酐 (6FDA) 为原料，采用不同的 FTPPA、BAFL 单元比例（3:1、2:1、1:2 和 1:3），制备了一系列基于 6FDA-FTPPA/BAFL 主干的氟化共聚酰亚胺薄膜：BAFL单元的不同比例（3:1、2:1、1:1、1:2 和 1:3）。共聚酰亚胺不仅具有高热稳定性（Tg > 357°C）、良好的光学性能（λcutoff > 327 nm）和疏水性（接触角 >91.4°），而且在高沸点和低沸点有机溶剂中都具有良好的溶解性能。利用分子力学和分子动力学模拟了聚合物的自由体积分数，并将其与气体分离实验数据进行了关联。大体积基团的存在导致了高自由体积分数（17.8%），并形成了直径在 5.48 至 5.72 Å 之间的大微腔，从而有效地提高了气体渗透性。在纯气体渗透实验中，6FDA-FTPPA/BAFL（3:1）薄膜对 CO2 和 He 的渗透系数分别为 41.48 和 79.38 巴，在气体渗透性方面优于商用 Matrimid 和 Kapton。特别是共聚酰亚胺膜中的 6FDA-FTPPA/BAFL (1:2) 和 6FDA-FTPPA/BAFL (1:3) 对 O2/N2 气体对的分离性能最具吸引力，接近 1991 年罗伯逊上限。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

High Performance Polymers 化学-高分子科学

CiteScore

4.20

自引率

14.30%

发文量

106

审稿时长

1.2 months

期刊介绍： Health Services Management Research (HSMR) is an authoritative international peer-reviewed journal which publishes theoretically and empirically rigorous research on questions of enduring interest to health-care organizations and systems throughout the world. Examining the real issues confronting health services management, it provides an independent view and cutting edge evidence-based research to guide policy-making and management decision-making. HSMR aims to be a forum serving an international community of academics and researchers on the one hand and healthcare managers, executives, policymakers and clinicians and all health professionals on the other. HSMR wants to make a substantial contribution to both research and managerial practice, with particular emphasis placed on publishing studies which offer actionable findings and on promoting knowledge mobilisation toward theoretical advances. All papers are expected to be of interest and relevance to an international audience. HSMR aims at enhance communication between academics and practitioners concerned with developing, implementing, and analysing health management issues, reforms and innovations primarily in European health systems and in all countries with developed health systems. Papers can report research undertaken in a single country, but they need to locate and explain their findings in an international context, and in international literature.