Grafting zwitterionic brush on the surface of PVDF membrane using physisorbed free radical grafting technique
Grafting zwitterionic brush on the surface of PVDF membrane using physisorbed free radical grafting technique
复制标题
DOI：
10.1016/j.memsci.2012.02.062
复制
发表时间：
2012-07
影响因子：
9.5
通讯作者：
Mi-Zi Li;Jian-Hua Li;Xi-Sheng Shao;Jing Miao;Jia-bin Wang;Qiqing Zhang;Xiaoping Xu
中科院分区：
文献类型：
--
作者：
Mi-Zi Li;Jian-Hua Li;Xi-Sheng Shao;Jing Miao;Jia-bin Wang;Qiqing Zhang;Xiaoping Xu
首次采用物理吸附自由基接枝技术将两性离子单体甲基丙烯酸磺基甜菜碱(SBMA)接枝到PVDF膜表面。初步探讨了自由基引发PVDF膜接枝聚合的机理。考察了单体浓度、反应时间、反应温度等因素对接枝密度的影响。结果表明，PSBMA在PVDF膜上的接枝密度随单体浓度的增加和反应时间的延长而提高。接枝的最适温度为70℃左右。用衰减全反射/傅里叶变换红外光谱(FTIR-ATR)和X射线光电子能谱(XPS)分析了膜表面的化学成分。用扫描电子显微镜(SEM)对膜的形貌进行了表征。接枝PSBMA后，膜表面的亲水性得到改善。膜表面的水接触角在120s内由59°降至17°，膜表面的水接触角为0.608 mg/cm2。静态蛋白质吸附和动态耐污染实验表明，表面接枝PSBMA使PVDF膜具有良好的抗污染能力。
A facile, effective method was first used to graft zwitterionic monomer sulfobetaine methacrylate (SBMA) onto the surface of PVDF membrane via physisorbed free radical grafting technique. The mechanism of free radical initiating grafting polymerization on PVDF membrane was investigated preliminarily. The key factors affecting the graft density (GD), include monomer concentration, reaction time and the temperature, were investigated in the present study. As the result, the graft density of PSBMA on PVDF membrane was improved with the increasing of monomer concentration and reaction time. Around 70°C was the optimum temperature for the grafting. Attenuated total reflectance/Fourier transform infrared spectroscopy (FTIR-ATR) and X-ray photoelectron spectroscopy (XPS) were conducted to confirm the chemical composition of the membrane surface. The morphology of membranes was characterized by scanning electron microscopy (SEM). After the PSBMA was grafted, the hydrophilicity of membrane surface was improved. The water contact angle decreased from 59° to 17° within 120s was achieved at the surface of membrane with GD 0.608mg/cm2. The static protein adsorption and the dynamic fouling-resistance experiment demonstrated that grafting PSBMA on the surface endow PVDF membrane excellent anti-fouling ability.