两亲性超支化聚合物对PVDF膜的共混改性  

Modification of PVDF porous membrane by blending with amphiphilic hyperbranched polymer

作　　者：赵永红[1] 张梅[1] 朱宝库[1] 徐又一[1] 

机构地区：[1]浙江大学高分子科学研究所,杭州310027

出　　处：《膜科学与技术》2008年第4期71-76,共6页Membrane Science and Technology

基　　金："973"计划资助项目(2003CB615705);"863"计划资助项目(2006AA03Z233)

摘　　要：采用对苯二甲酰氯(TPC)为偶联剂,将不同分子量的端羟基聚乙二醇(MPEG,-Mn分别为350,750,2000)接枝到超支化聚酯(HPE)分子周围,合成了两亲性超支化聚合物(HPE-g-MPEG),并将其与聚偏氟乙烯(PVDF)共混,通过相转化法制备了PVDF多孔膜.用SEM,XPS,水接触角,BSA吸附等对共混膜的结构和性能进行了表征.XPS结果表明,超支化聚合物在膜表面呈现富集现象,该富集现象随聚乙二醇(MPEG)分子量的增大而加强.同时,随着聚乙二醇(MPEG)分子量的增大,膜表面的水接触角下降,BSA吸附量减少,表明共混膜的亲水性和抗污染能力提高.Amphiphilic hyperbranched-star polymers （HPE-g-MPEG） with different arm length were synthesized by grafting methoxy poly（ethylene glycol） s （ MPEGs, Mn = 350,750, and 2 000, respectively） to the hyperbranched polyester （HPE） molecule using terephthaloyl chloride （TPC） as the coupling agent, and blend- ed with PVDF to fabricate porous membranes via phase inversion process. Membrane morphologies were ob- served by scanning electron microscopy （SEM）, and chemical composition changes of the membrane surfaces were measured by X-ray photoelectron spectroscopy （XPS）. Water contact angle, static protein adsorption, and filtration experiments were used to evaluate the hydrophilicity and anti - fouling properties of the membranes. It was found that, with the increase in MPEG arm length, the MPEG segments of HPE- g- MPEG enriched at the membrane surfaces substantially, resulting in a significant decrease in water contact angle. Furthermore, the blend membranes containing longer arm HPE g MPEGs showed lower static protein adsorption, higher protein solution fluxes, and better protein solution flux recovery than the pure PVDF membrane.

关 键 词：两亲性 超支化 聚偏氟乙烯 多孔膜 表面富集 

分 类 号：TB383.2[一般工业技术—材料科学与工程]