ATRP of amphiphilic graft copolymers based on PVDF and their use as membrane additives
ATRP of amphiphilic graft copolymers based on PVDF and their use as membrane additives
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DOI：
10.1021/ma0122270
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发表时间：
2002-09-24
期刊：
影响因子：
5.5
通讯作者：
Mayes, AM
中科院分区：
文献类型：
--
作者：
Hester, JF;Banerjee, P;Mayes, AM
采用原子转移自由基聚合（ATRP）方法，以聚偏氟乙烯（PVDF）为原料，直接合成了两亲性接枝共聚物。这里，PVDF的第二氟化位点的直接引发促进亲水性共聚单体的接枝。使用该方法制备了具有聚（甲基丙烯酸）侧链的PVDF的两亲性梳状共聚物衍生物（PVDF-g-PMAA）和具有聚（甲基丙烯酸环氧酯）侧链的PVDF的两亲性梳状共聚物衍生物（PVDF-g-POEM）。PVDF-g-POEM添加剂在PVDF中的表面偏析被检查作为在PVDF过滤膜上的抗污、抗污染表面的途径。由于在用于膜制造的标准浸没沉淀过程中的表面偏析，本体POEM浓度为3.4重量%的PVDF/5重量% PVDF-g-POEM膜表现出通过X射线光电子能谱（XPS）测量的42重量%的近表面POEM浓度。这种膜显示出相当大的阻力BSA污染与纯PVDF和润湿时，放置在与水接触自发。
The direct preparation of amphiphilic graft copolymers from commercial poly(vinylidene fluoride) (PVDF) using atom transfer radical polymerization (ATRP) is demonstrated. Here, direct initiation of the secondary fluorinated site of PVDF facilitates grafting of the hydrophilic comonomer. Amphiphilic comb copolymer derivatives of PVDF having poly(methacrylic acid) side chains (PVDF-g-PMAA) and poly(oxyethylene methacrylate) side chains (PVDF-g-POEM) are prepared using this method. Surface segregation of PVDF-g-POEM additives in PVDF is examined as a route to wettable, foul-resistant surfaces on PVDF filtration membranes. Because of surface segregation during the standard immersion precipitation process for membrane fabrication, a PVDF/5 wt % PVDF-g-POEM membrane, having a bulk POEM concentration of 3.4 wt %, exhibits a near-surface POEM concentration of 42 wt % as measured by X-ray photoelectron spectroscopy (XPS). This membrane displays substantial resistance to BSA fouling compared with pure PVDF and wets spontaneously when placed in contact with water.