新型亲水性PVDF中空纤维膜的制备  

Preparation of novel hydrophilic PVDF hollow fiber membranes

作　　者：王蕾[1,2] 魏俊富[1,2] 陈远[1,2] 李诗颖[1,2] 任宗晨[1,2] 凌茜茜[1,2] 

机构地区：[1]天津工业大学中空纤维膜材料与膜过程省部共建国家重点实验培育基地,天津300387 [2]天津工业大学环境与化学工程学院,天津300387

出　　处：《天津工业大学学报》2013年第2期7-10,共4页Journal of Tiangong University

基　　金：国家自然科学基金资助项目(51078264)

摘　　要：通过高能电子束辐照接枝的方法,在丙烯酸羟乙酯/水的混合溶液中,将丙烯酸羟乙酯(HEA)单体引入到PVDF中空纤维膜,对其表面进行亲水改性;考察单体浓度、辐照剂量对接枝率的影响,以及不同接枝率对膜表面形貌、化学组成及亲水性的影响;利用衰减全反射红外光谱(FT-IR)和扫描电子显微镜(SEM)对接枝改性前后PVDF中空纤维膜的化学组成及形态结构进行表征,并进行性能测试.结果表明:辐照剂量和单体浓度对接枝率都有显著影响;改性后PVDF中空纤维膜表面的亲水性能得到明显改善;接枝率为3.47%时纯水通量增大至372.69 L(/m2.h),比原膜的纯水通量增加了191%,膜表面接触角明显下降,吸水率显著提高.The PVDF hollow fiber membrane is modified through grafting polymerization of 2-hydroxyethyl acrylate （HEA）, initiated by high energy electron beam in HEA/water mixture solution. The factors influenced the grafting degree such as the irradiation dose and the monomer concentration are discussed. The grafting conditions are optimized and the effects of grafting degree on some parameters such as the membrane morphology, the chemical structure and the hydrophilicity are investigated. Fourier transform infrared spectra （FT-IR） and scanning electron microscopy （SEM） are used to characterize the chemical and morphological changes of the PVDF hollow fiber membrane. And the properties of modified membrane are tested. The results show that the monomer concentration and irradiation dose play the dominant role in grafting degree. The hydrophilicity of PVDF hollow fiber membrane surface is enhanced after graft polymerization. When the grafting degree is 3,47%, the water flux is up to 372.69 L/（m^2. h）, which is approximately 191% higher than the original membrane. The contact angle decreases and the water absorption improves significantly.

关 键 词：PVDF中空纤维膜 丙烯酸羟乙酯(HEA) 高能电子束 接枝聚合 亲水改性 

分 类 号：TS102.528.1[轻工技术与工程—纺织工程] TQ342.712[轻工技术与工程—纺织科学与工程]