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以过氧化苯甲酰(BPO)作引发剂,通过溶液接枝聚合法把苯乙烯/丙烯酸同时接枝到原硅酸钠改性的聚偏氟乙烯(PVDF)膜上,磺化后得到聚偏氟乙烯接枝磺化聚(苯乙烯-co-丙烯酸)膜(PVDF-g-P(SSA-co-AA)).研究了苯乙烯和丙烯酸的不同比例对膜的接枝反应及其相对湿度对膜电导率和含水量的影响.用傅立叶变换红外光谱(FTIR)检测原硅酸钠改性的PVDF膜经过接枝和磺化后所发生的结构变化,并用扫描电镜(SEM)观察PVDF膜接枝前后的形貌以及接枝磺化后产物PVDF-g-P(SSA-co-AA)膜的形貌及硫和硅分布.结果表明,原硅酸钠改性的PVDF膜与苯乙烯/丙烯酸同时发生接枝聚合反应,环境的相对湿度在20%～80%范围,对添加10wt%Na4SiO4的PVDF-g-P(SSA-co-AA)膜的电导率的影响基本不变,并达到0.0198S·cm-1.原硅酸钠改性的PVDF膜结构在接枝前后和磺化前后发生变化,确认磺化反应不只是在膜表面,同时渗入膜中进行.
Using benzoyl peroxide (BPO) as initiator, the styrene / acrylic acid was simultaneously grafted onto the sodium silicate-modified polyvinylidene fluoride (PVDF) membrane by the solution graft polymerization method to obtain the poly (PVDF-gP (SSA-co-AA)) was prepared by graft copolymerization of vinylidene fluoride and polyvinylidene fluoride Membrane conductivity and water content.The structure changes of the modified sodium silicate-modified PVDF membrane after grafting and sulfonation were detected by Fourier transform infrared spectroscopy (FTIR), and the morphology of PVDF membrane was observed by scanning electron microscope (SEM) The morphologies of the PVDF-gP (SSA-co-AA) films and the distribution of sulfur and silicon after grafting were studied. The results showed that sodium orthosilicate modified PVDF films with styrene / acrylic acid The grafting reaction occurred in the range of 20% ~ 80% relative humidity. The influence on the conductivity of PVDF-gP (SSA-co-AA) film with 10wt% Na4SiO4 remained unchanged and reached 0.0198S · cm -1. The structure of sodium silicate-modified PVDF membranes changed before and after grafting and before and after sulfonation. It was confirmed that the sulfonation was carried out not only on the membrane but also on the membrane.