摘要
用一步自由基聚合法从苯乙烯(St)和甲基丙烯酸(MAA)制备了一种两亲性共聚物PSxMAAy,并将其作为聚偏氟乙烯(PVDF)膜材料的共混添加剂,通过液体沉淀相转化法制备得到各种改性的PVDF膜.研究表明,该添加剂PSxMAAy不仅和PVDF在一定范围内有好的相容性,而且含较高MAA比例的添加剂(即PS1MAA1相对于PS4MAA1)对PVDF膜的亲水性及抗污染性的提高具有更大的优势.取决于添加剂的比例,改性PVDF膜的亲水性可大大提高(水接触角可从未改性PVDF膜的93.5°下降为改性PVDF膜的62.1°);对牛血清蛋白(BSA)的抗污染能力显著增强(相比未改性膜BSA的静态吸附量的降低可高达82%).在对BSA和正十六烷乳液的膜过滤实验中,改性PVDF膜对BSA和正十六烷均表现出较好的截留效果和更强的抗污染性能,相比未改性膜的通量衰减率降低而通量恢复率提高.
A new type of amphiphilic copolymer, PSxMAAy, was synthesized through an easily one-step method of the free radical polymerization, and was used as an additive to prepare a series of modified PVDF membranes by blending with PVDF and casting their homogeneous solution through the liquid precipitation phase inversion technique. The results showed that PSxMAAy had a well compatibility with PVDF. And those containing a higher ratio of MAA, PS1MAA1 showed better hydrophilicity and anti-fouling modification effect on modified membranes. Based on the proportion of additives, the hydrophilities of the modified membranes were improved greatly （the water contact angle of the membranes could be reduced from 93.5°for PVDF to 62. 1° for modified PVDF membranes）. The anti-fouling ability of protein was significantly enhanced. The static adsorption amount of BSA on the modified membranes could be decreased by 82% as compared with that for the unmodified membrane. The filtration of both BSA solution and hexadecane emulsion, the modified membranes also showed much higher rejection, lower flux decay and higher flux recovery after cleaning.
作者
李妍
周晓吉
沈舒苏
杨晶晶
白仁碧
LI Nan ZHOU Xiaoji SHEN Shusu YANG Jingjing BAI Renbi(Center for Separation and Purification Materials and Technologies, Suzhou 215009, China Jiangsu Collabrative Innovation Center of Technology and Material of Water Treatment, Suzhou University of Science and Technology, Suzhou 215009, China)
出处
《膜科学与技术》
CAS
CSCD
北大核心
2016年第6期70-77,共8页
Membrane Science and Technology
基金
国家自然科学基金项目(51478282)
苏州市分离净化材料与技术重点实验室(SZS201512)
苏州市水利水务科研课题(2015-7-1)
苏州科技学院校科研基金项目(XKQ201502)
关键词
两亲性共聚物合成
新型添加剂
PVDF膜改性
膜亲水和抗污染性能改进
amphiphilic copolymer synthesis
a new type of additive
modified PVDF membrane
hydrophilic and anti-fouling improvement
