N,N-二甲基乙酰胺/氯化锂体系下醋酸纤维素/聚醚砜共混膜的制备与表征  

Preparation and characterization of blend membranes from cellulose acetate and polyethersulfone under N,N-dimethylacetamide/lithium chloride system

作　　者：孙中华 赵高杰[1] 陈夫山 王爱艾 

机构地区：[1]曲阜师范大学工学院,山东日照276826 [2]天津市制浆造纸重点实验室天津科技大学,天津300457 [3]青岛科技大学海洋科学与生物工程学院,青岛266042

出　　处：《膜科学与技术》2017年第6期46-52,共7页Membrane Science and Technology

基　　金：天津市制浆造纸重点实验室(天津科技大学)开放基金资助项目(201604);山东省高等学校科技计划项目(J15LC03);国家星火计划项目(2015GA105002);973计划前期研究专项(2014CB460610)

摘　　要：为提高纯聚醚砜(PES)膜的亲水性和抗污染能力,以N,N-二甲基乙酰胺/氯化锂(DMAc/LiCl)体系为溶剂,以聚乙烯吡咯烷酮(PVP K30)为添加剂,采用相转化法制备醋酸纤维素(CA)/聚醚砜(PES)共混膜.探讨和分析了成膜过程中的各种因素对膜纯水通量和BSA(牛血清蛋白)截留性能的影响.确定CA/PES共混膜的最佳铸膜条件为:聚醚砜质量分数18%,PVP K30的质量分数4%,醋酸纤维素质量分数3%,预蒸发时间为20s.对共混膜进行了SEM形貌结构、热稳定性、接触角测试、BSA抗污染性能和共混相容性分析表征.结果表明,DMAc/LiCl体系下制备的CA/PES共混膜亲水性和BSA抗污染性能高于纯PES膜,CA/PES共混体系为部分相容体系,CA/PES共混膜的高温热稳定性稍有下降.In order to improve the hydrophilicity and anti-fouling ability of the pure PES membranes, CA/ PES blend membranes were prepared successfully with PVP K30 as additive and using N, N-dimethylacetamide/lithium chloride as solvent. The effects of blend composition on the pure water flux and BSA rejection were studied and the preparation condition was optimized as follow： 18% （PES mass fraction）, 4%（PVP K30 mass fraction）, 3%（CA mass fraction） and 20 s （evaporation time）. The characteristics of blend membranes were investigated through the methods of SEM, thermogravimetric analysis, contact angle measurements, BSA anti-fouling property and compatibility. The results showed that the performances of the CA/PES blend membranes such as hydrophilicity and BSA anti-fouling ability were enhanced with the incorporation of CA. The viscosities curve analyses of the blend casting solution indicated semi-compatibility between CA and PES. The thermal stability at high temperatures decreased slightly after blending.

关 键 词：醋酸纤维素 抗污染性能 共混膜 亲水性 

分 类 号：TQ051.893[化学工程]