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基于缩醛化反应的聚氧化乙烯-聚乙烯醇膜制备及其CO2/N2分离性能

作者：黄佳敏，瞿政，董亮亮，董玉明，张春¹，白云翔，朱永法

单位： 1江南大学合成与生物胶体教育部重点实验室化学与材料工程学院，无锡214122 2清华大学化学系北京100084

关键词：缩醛化反应；聚氧化乙烯；聚乙烯醇；膜；二氧化碳分离

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2023,43(5):98-105

摘要：

以低分子量聚氧化乙烯醛（PEO-CHO）为改性剂，通过缩醛化反应制备出新型聚氧化乙烯-聚乙烯醇（PEO-PVA）膜，研究了PEO-CHO添加量对膜理化结构和CO2/N2分离性能的影响。结果表明：PEO-CHO的端醛基可与PVA分子链上的羟基发生缩醛化反应，形成交联和接枝共存结构，从而有效抑制PVA结晶，提高PVA膜的气体渗透系数；当PEO-CHO添加量为90 wt%时，PEO-PVA膜的结晶度仅为1.34%，CO2渗透系数达到15.7 Barrer。此外，PEO-CHO含有的醚氧重复单元可以提高膜的CO2亲和力，PEO-PVA膜的CO2/N2理想选择性保持在56。

A novel poly(oxyethylene)-poly(vinyl alcohol) (PEO-PVA) membrane was prepared by acetalization using low molecular weight poly(oxyethylene) aldehyde (PEO-CHO) as a modifier, and the effects of PEO-CHO addition amount on the physical and chemical structure and CO2/N2 separation performance of the membrane were studied. The results show that the terminal aldehyde group of PEO-CHO can react with the hydroxyl group on the PVA molecular chains to form a coexisting structure of cross-linking and grafting, which can effectively inhibit PVA crystallization and increase the gas permeability of PVA membranes; The crystallinity of PEO-PVA membrane is only 1.34% when the PEO-CHO addition amount is 90 wt%, and the CO2 permeability reaches 15.7 Barrer. In addition, the ether oxygen repeating unit contained in PEO-CHO can increase the CO2 affinity of the membrane, and the CO2/N2 ideal selectivity of PEO-PVA membrane reached 56.

基金项目：

江苏省碳达峰碳中和科技创新专项资金项目（BK20220023）；国家自然科学基金面上项目（22075107）

作者简介：

黄佳敏（1998-），男，江西新余人，硕士生，主要从事气体分离膜的研究，E-mail：1481995845@qq.com

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