主链型聚氨酯光动力高分子的合成与表征

合成了一种主链含推拉电子型偶氮苯基团的聚氨酯光动力高分子 .对聚合物的结构、热性能及光学性能进行了表征 .此聚合物为主链含假芪型偶氮生色团的无定形高分子 .用 4 88nmAr+ 激光对聚合物薄膜进行光加工 ,得到了规则的正弦表面起伏光栅 ,其起伏深度大于 2 0 0nm .光栅的一级衍射效率可达 2 4 % .

A NOVEL PHOTODYNAMIC POLYURETHANE CONTAINING MAIN-CHAIN ELECTRON DONATING-ACCEPTING AZOBENZENE CHROMOPHORES

A novel polyurethane containing main chain electron donating accepting azobenzene chromophores has been prepared.Compound (Ⅰ) 4 carboxyl|4′[(2|hydroxyethyl)|ethylamino] azobenzene was synthesized from azo coupling reaction between p aminobenzoic acid and N ethyl N hydroxyethylaniline.Monomer (Ⅱ) 4 [(2 hydroxyethyl)ethylamino] 4′ (2 hydroxyethyloxycarbonyl) azobenzene was obtained by reaction between (Ⅰ) and 2 chloroethanol.The chemical structure and purity of the compound (Ⅰ) and monomer (Ⅱ) were confirmed by the characterization of 1H NMR,FTIR and UV Vis spectrometry.Through the polymerization reaction between azo monomer(Ⅱ) and TDI,the azo polymer was obtained.The chemical structure of polymer was characterized by 1H NMR、FTIR and UV Vis spectrometry.The molecular weight and its distribution were determined by GPC to be M n=4800 with a polydispersion index 1 3.From DSC thermogram,a glass transition temperature of 119℃ was observed.The polymer synthesized exhibits significant photodynamic behavior.Surface profile gratings were optically inscribed upon exposure to an interference pattern of Ar + laser beam at modest intensities.The surface modulation was about 220 nm and the first order of diffraction efficiency was up to 24%.