以过氧化对苯二甲酰（BPO）为引发剂，3-苯基丙烯酸为单体，在N,N-二甲基甲酰胺溶液中引发接枝聚合，制得接枝3-苯基丙烯酸的聚偏氟乙烯。通过红外测试、差示扫描量热仪以及热失重分析表明3-苯基丙烯酸（CA）接枝到PVDF骨架上。通过接触角测试，发现改性后的聚偏氟乙烯（PVDF-g-P(CA)）的接触角由88°降低到54°。以聚乙烯吡咯烷酮（PVP）为致孔剂，分别以PVDF和改性后的PVDF-g-P(CA)为原料，采用流延法制备聚偏氟乙烯膜。通过扫描电子显微镜(SEM)观测了PVDF 膜改性前后的表面形貌，测试接枝前后PVDF膜纯水通量。结果表明，PVDF-g-P(CA)膜的孔径在600-700 nm之间，孔径分布较均匀，纯水通量为81 L/(m2•h)，比PVDF膜的水通量增加了16 L/(m2•h)。

Cinnamic acid (CA)-graft-poly(vinylidenefluoride) (PVDF) was synthesized using benzoyl peroxide （BPO） as initiator in a N,N-dimethylformamide (DMF) solution. FTIR spectroscopy, DSC, and TG analyses of the grafted polymers showed that the CA side chains were grafted onto the PVDF backbone. Contact angle measurements indicated that the contact angle of modified PVDF reduced from 88° to 54°. Microporous membranes were prepared from PVDF and the PVDF-g-P(CA) polymer with poly(vinyl pyrrolidone) (PVP) as the pore former by the tape
casting method. The morphology of the membranes was studied by scanning electron microscope (SEM). The membranes cast from the DMF solution of PVDF-g-P(CA) had a greater pore size distribution (600-700nm) and higher porosities than those of the pristine PVDF. The flux of the modified PVDF was 81 L/(m2•h), which increased by 16 L/(m2•h) over the pure PVDF.

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