基于缩醛化反应的聚氧化乙烯-聚乙烯醇膜制备及其CO_(2)/N_(2)分离性能  

Preparation of poly(oxyethylene)-poly(vinyl alcohol)membranes based on the reaction of acetalization for CO_(2)/N_(2) separation

作　　者：黄佳敏 瞿政 董亮亮 董玉明 张春芳 白云翔 朱永法[2] HUANG Jiamin;QU Zheng;DONG Liangliang;DONG Yuming;ZHANG Chunfang;BAI Yunriang;ZHU Yongfa(Key Laboratory of Synthetic and Biological Colloids,Ministry of Education,School of Chemical and Material Engineering,Jiangnan University,Wuxi 214122,China;Department of Chemistry,Tsinghua University,Beijing 100084,China)

机构地区：[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

出　　处：《膜科学与技术》2023年第5期98-105,共8页Membrane Science and Technology

基　　金：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)。

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CO_(2)/N_(2)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添加质量分数为90%时,PEO-PVA膜的结晶度仅为1.34%,CO_(2)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CO_(2)亲和力,PEO-PVA膜的CO_(2)/N_(2)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 CO_(2)/N_(2) separation performance of the membrane were studied.The results show that the terminal aldehyde group of PEOCHO 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%,and the CO_(2) permeability reaches 15.7 Barrer.In addition,the ether oxygen repeating unit contained in PEO-CHO can increase the CO_(2) affinity of the membrane,and the CO_(2)/N_(2) ideal selectivity of PEO-PVA membrane reached 56.

关 键 词：缩醛化反应 聚氧化乙烯 聚乙烯醇 膜 二氧化碳分离 

分 类 号：TQ028.8[化学工程]