大分子紫外线吸收剂的制备及其在聚偏氟乙烯中的应用

通过原子转移自由基聚合(ATRP)方法,将反应型紫外线吸收剂2-羟基-4-(3-甲基丙烯酸酯基-2-羟基丙氧基)二苯甲酮(BPMA)与甲基丙烯酸甲酯(MMA)共聚合成紫外线吸收剂P(MMA-co-BPMA),然后共混涂膜制备出具有紫外线吸收性能的聚偏氟乙烯(PVDF)复合膜。 通过核磁共振谱(NMR)、凝胶渗透色谱(GPC)、差示扫描量热仪(DSC)等技术手段对BPMA及P(MMA-co-BPMA)的结构和性能进行表征,通过紫外-可见光谱(UV-Vis)对制备的复合膜的紫外线吸收性能进行表征。 结果表明,大分子紫外线吸收剂P(MMA-co-BPMA)相对分子量分布较窄,为1.11。 当BPMA质量分数为0.68%时,P(MMA-co-BPMA)/PVDF复合膜在200~345 nm范围内透过率可降至0.4%以下,能够实现对紫外线的完全吸收。 抽提实验表明紫外线吸收剂大分子化可有效地防止外迁移。

Preparation of Macromolecular Ultra-violet Absorber and Its Application in Poly(vinylidene fluoride)

The macromolecular ultraviolet(UV) absorber P(MMA-co-BPMA) was synthesized by copolymerization of 2-hydroxy-4-(3-methacryloxy-2-hydroxylpropoxy) benzophenone(BPMA) and methylmethacrylate(MMA) through atom transfer radical polymerization(ATRP). The UV-absorbing poly(vinylidene fluoride)(PVDF) composite membranes were made by blend coating. The structure and property of BPMA and P(MMA-co-BPMA) were characterized by nuclear magnetic resonance spectroscopy(NMR), gel permeation chromatography(GPC) and differential scanning calorimeter(DSC). UV absorbing property of the obtained composite membranes was investigated by UV-Vis spectroscopy. The results demonstrate that the relative molecular mass polydispersity index(PDI) of P(MMA-co-BPMA) is 1.11. When the mass fraction of BPMA is 0.68%, the UV transmittance of P(MMA-co-BPMA)/PVDF composite membrane decreases to less than 0.4% in the range of 200~345 nm. In addition, copolymerization of the UV absorber effectively prevents the out-migration as demonstrated in the extraction experiment.