摘要
采用热致相分离方法,选择乙烯的摩尔分数为32%的乙烯-乙烯醇共聚物(EVOH)为原料,丙三醇为稀释剂制备了亲水性高分子平片式微孔膜,并研究了体系组成、冷却速率等对膜的结构和性能的影响.测试了膜的纯水通量、截留率和孔隙率,用泡点法测得了平均孔径,并用扫描电子显微镜(SEM)表征了微孔膜的断面形态.结果表明:分相的方式及微孔的形态由体系组成及冷却速率决定.降低聚合物浓度,延缓冷却速率,都有利于较大孔径膜的生成并得到较大的纯水通量和孔隙率,同时截留性能有所下降.
The flat sheet microporous EVOH membranes were prepared by athermally induced phase separation （TIPS） process using glycerol as a diluent. The effects of polymer concentrations and cooling rates on the morphology and performance were investigated. The results showed that： higher solute rejection, lower water permeance and porosities and smaller average pore size were obtained by increasing the polymer concentration in the dope solution and by increasing the cooling rate in the TIPS process.
出处
《膜科学与技术》
CAS
CSCD
北大核心
2009年第1期41-46,共6页
Membrane Science and Technology
基金
中国科学院院长基金特别支持项目(无编号)
关键词
热致相分离
EVOH
平片式微孔膜
膜结构与性能
thermally induced phase separation
poly （ethylene- co- vinyl alcohol）
flat sheeet microporous membrane
membrane morphology and performance
