聚乙二醇添加剂对聚砜超滤膜结构和性能的影响  

Effects of PEG additives on morphology and performance of polysulfone membrane

作　　者：安亚欣[1] 张奇峰[1] 张所波[1] 

机构地区：[1]中国科学院长春应用化学研究所生态环境高分子材料重点实验室,长春130022

出　　处：《膜科学与技术》2015年第5期64-70,共7页Membrane Science and Technology

基　　金：国家重点基础研究发展计划(2015CB655302);国家自然科学基金(51203151)

摘　　要：采用聚乙二醇(PEG)为添加剂,1-甲基-2-吡咯烷酮(NMP)为溶剂制备了聚砜(PSf)超滤膜.系统研究了PEG的含量和分子量对PSf膜的断面结构、平均孔径(r)、孔隙率(ε)、纯水通量(PWF)及接触角(CA)的影响.膜断面的SEM照片表明,随着铸膜液中PEG含量的增加或PEG分子量的增大,断面的泪滴状孔逐渐消失,靠近膜上表面的海绵层厚度增加.随着PEG含量的增加,膜的r先增加后减小再增加,ε先略有增加后明显增加,PWF与r的变化趋势一致;随着PEG分子量的增加,膜的r先增加后降低再升高,最后迅速下降,膜的ε先增加后降低,PWF和r的变化趋势一致.当PEG400含量增大(≥16.8%)或PEG分子量增加(≥2 000)时,CA降低.Polysulfone（PSf）membrane was prepared by using PSf/N-methyl-2-pyrrolidone（NMP）/poly（ethylene glycol）（PEG）casting solution and water coagulant.Effects of the content and molecular weight of PEG on the morphology,the mean pore radius（r）,porosity（ε）,pure water flux（PWF）and contact angel（CA）of PSf membrane were systematically investigated.SEM images of the PSf membranes showed that the teardrop-shaped pores disappeared and the thickness of the sponge layer near the top surface of the membrane increased as the content or molecular weight of PEG additive increased.As the content of PEG400 increased in the membrane dope solution,rincreased firstly,then decreased,and finally increased again;εfirst increased slightly,and then increased sharply;the trend of PWF was consistent with that of r.As the molecular weight of PEG increased,r increased firstly,then decreased slightly,and then increased sharply,finally decreased sharply;meanwhileεincreased firstly,and then decreased sharply;the trend of PWF was consistent with that of r.The CA of PSf membrane decreased when PEG400 content increased（≥16.8%）or the molecular weight of PEG increased（≥2 000）.

关 键 词：聚砜 超滤膜 添加剂 

分 类 号：TQ051.893[化学工程] TQ317