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研究了以二苯甲酮 (BP)为光敏剂 ,丙烯酸在低密度聚乙烯 (LDPE)膜上两步法气相光接枝聚合 ;从反应的基本要素出发 ,利用紫外光分光光度计跟踪测定了二苯甲酮在LDPE膜中的扩散情况 ,发现其扩散系数随BP浓度的升高而降低 ,约在 0 8～ 2 0× 10 -12 m2 ·s-1之间 .同样方法跟踪测定了BP在不同条件下的光还原反应 ,结果表明 :当远紫外光被滤掉后 ,其半衰期大大加长 ,氧气的存在更是加剧了这一效应 ;并且通过测定不同条件下气相光接枝聚合的一些基本规律 ,提出单体扩散为该气相光接枝聚合的控制步骤
The photo-grafting polymerization of acrylic acid on low-density polyethylene (LDPE) membrane with benzophenone (BP) as photosensitizer was studied. The basic elements of the reaction were determined by UV spectrophotometer Benzophenone in the LDPE film diffusion and found that the diffusion coefficient decreases with increasing BP concentration, about 0 8 ~ 2 0 × 10 -12 m2 · s-1 between the same method to track the determination of BP The photoreduction reaction under different conditions showed that when the UV light was filtered out, its half-life was greatly prolonged and the presence of oxygen further exacerbated this effect; and by measuring some of the photopolymerization of the gas phase under different conditions The basic law, proposed monomer diffusion as the control step of the gas-phase photopolymerization