Synthesis and Gas Separation Properties of Isocyanate-based Soluble Polyimide Membranes

SHI En; DONG Jie; ZHAO Xin; ZHANG Qing-hua

doi:10.14028/j.cnki.1003-3726.2023.09.007

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Synthesis and Gas Separation Properties of Isocyanate-based Soluble Polyimide Membranes

更新时间：2023-07-26

- Synthesis and Gas Separation Properties of Isocyanate-based Soluble Polyimide Membranes
- Polymer Bulletin Vol. 36, Issue 9, Pages: 1182-1190(2023)
- 作者机构：
  
  东华大学　纤维材料改性国家重点实验室，上海　201620
- 作者简介：
- 基金信息：
- DOI：10.14028/j.cnki.1003-3726.2023.09.007
  CLC：
- Published：20 September 2023，
  
  Received：06 December 2022，
  
  Revised：10 February 2023，
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SHI En, DONG Jie, ZHAO Xin, ZHANG Qing-hua. Synthesis and Gas Separation Properties of Isocyanate-based Soluble Polyimide Membranes. [J]. Polymer Bulletin 36(9):1182-1190(2023)
DOI：

SHI En, DONG Jie, ZHAO Xin, ZHANG Qing-hua. Synthesis and Gas Separation Properties of Isocyanate-based Soluble Polyimide Membranes. [J]. Polymer Bulletin 36(9):1182-1190(2023) DOI： 10.14028/j.cnki.1003-3726.2023.09.007.

摘要

针对传统聚酰亚胺（PI）分离膜对气体渗透系数低的问题，本文利用3，3'，4，4'-二苯酮四羧酸二酐（BTDA）、甲苯二异氰酸酯（TDI）、二苯基甲烷二异氰酸酯（MDI）和四甲基苯二甲基二异氰酸酯（TMDXI）成功制备了新型可溶性PI分离膜。研究结果表明含四甲基侧基的TMXDI单体对PI分离膜的分子堆积结构、自由体积及分离膜的溶解性、力学性能及耐热稳定性等特性有显著的影响。随着TMDXI含量的增加，PI分离膜由脆性断裂转变为韧性断裂;同时，PI膜对不同气体分子的渗透性能均显著提高，当TMDXI添加量为30 mol%时，分离膜对CO

的渗透系数提高了144%。

Abstract

Series of soluble polyimides (PI) gas separation membranes were successfully synthetized by using 3

4'-benzophenonetetracarboxylic dianhydride (BTDA)

tolylene-2

4-diisocyanate (TDI)

diphenylmethane-4

4'-diisocyanate (MDI) and 1

3-bis(2-isocyanato-2-propanyl)benzene (TMDXI). It is shown that the incorporation of TMDXI has a great effect on the solubility

fractional free volume (FFV)

tensile strength

and thermal resistance of resultant PI membranes. The fracture behavior of PI membranes transforms from brittle fracture to ductile fracture

and the permeabilities of PI membranes increases for various gases attributed to introduced TMDXI moiety

and especially

the permeability for CO

of the PI membrane containing 30 mol% TMDXI increases 144% in relative to the sample without TMDXI.

关键词

聚酰亚胺膜可溶性自由体积气体分离

Keywords

Polyimide membraneSolubilityFractional free volumeGas separation

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东华大学纤维材料改性国家重点实验室

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