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Preparation of poly(oxyethylene)-poly(vinyl alcohol) membranes based on the reaction of acetalization for CO2/N2 separation

Authors： HUANG Jiamin, QU Zheng, DONG Liangliang, DONG Yuming, ZHANG Chunfang, BAI Yunxiang, ZHU Yongfa

Units： 1 Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Materials Engineering, Jiangnan University, Wuxi 214122, China. 2 Department of Chemistry, Tsinghua University, Beijing 100084, China

KeyWords： Acetalation, Poly(oxyethylene) aldehyde, Poly(vinyl alcohol), Membrane, CO2 separation

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2023,43(5):98-105

Abstract：

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.

Funds：

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）

AuthorIntro：

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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