大分子紫外线吸收剂的制备及其在聚偏氟乙烯中的应用

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

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-coBPMA)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。

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.