Effects of different coagulation baths on characteristics of cellulose membrane
YANG Hao1,3, CHEN Qi1, MA Xin-hua2, YAN Jie1, GUO Jian-liang2, LIN Hai-lin1
1. College of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China; 2. Guangdong Institute of World Soil Resources, Guangzhou 510385, China; 3. Guangzhou Key Laboratory for Efficient Utilization of Agricultural Chemicals, Guangzhou 510225, China
Abstract: Four kinds of cellulose membranes are manufactured from cotton pulp board through the phase inversion method,with ZnCl2 solution as solvent,and water,methanol,ethanol and acetone as coagulation baths,respectively.The microstructure of the membranes is observed and the formation mechanism is analyzed.Sequentially,the differences of those membranes in water flux,porosity and mechanical properties after drying are determined.The results show that the inner structure of all four membranes is a fibrous network structure.The membrane made with water as a coagulation bath has relatively stretched and thick internal fibers,as well as a porous skin,while the membrane made with organic solvents possesses curled and clumped internal fibers with finger-shaped pores,and dense and smooth skin.There is no significant differences among the four kinds of membranes in FT-IR,XRD and TG characterization.Compared with cotton linter,the membrane's crystal form changes from cellulose I to cellulose Ⅱ,its crystallinity decreases,its thermal stability decreases by about 30℃,and the residual carbon amount within the membrane increases.
杨浩, 陈琪, 马新华, 阎杰, 郭剑亮, 林海琳. 不同凝固浴对纤维素膜特征影响的研究[J]. 现代化工, 2020, 40(8): 162-166,172.
YANG Hao, CHEN Qi, MA Xin-hua, YAN Jie, GUO Jian-liang, LIN Hai-lin. Effects of different coagulation baths on characteristics of cellulose membrane. Modern Chemical Industry, 2020, 40(8): 162-166,172.
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