侧链含2,5-二苯基-1,3,4-噻二唑聚乙烯的制备及其性能

Study of Synthesis and Properties of Polystyrene Containing 2,5-Diphenyl-1,3,4-Thiadiazole in Side Chain

苯乙烯和4-氯甲基苯乙烯共聚得到侧链部分氯甲基化的聚苯乙烯(PSt-CH2Cl),氯甲基的含量由1H NMR和元素分析确定。另外以4-甲氧基苯甲酸为原料,经多步反应合成4-(5-苯基-1,3,4-噻二唑-2-基)苯酚(PTP)。在四氢呋喃溶液中,PTP和PSt-CH2Cl在碱作用下发生醚化反应,得到侧链含2,5-二苯基-1,3,4-噻二唑聚合物,聚合物溶液的荧光激发光谱显示激发峰为259 nm和366 nm;荧光发射光谱显示在370-500 nm处有很强的荧光。通过循环伏安法测得阳极和阴极的启动电位计算出聚合物的HOMO和LUMO分别为-6.34 eV和-2.90 eV,带隙Eg为3.44 eV,而紫外光谱测得的光学带隙Eg为3.38 eV(λonset367 nm)。

The partly chloromethylated polystyrene（PSt-CH2Cl）was synthesized via copolymerization of styrene and 4-chloromethyl styrene,the content of chloromethyl was determined by 1H NMR and element analyses.5-（4-phenyl-1,3,4-thiadiazole-2-yl） phenol（PTP） was synthesized via multi step reaction from 4-methoxybenzoic acid.The polymer containing 2,5-diphenyl-1,3,4-thiadiazole in side chain was obtained by etherification of PTP and PSt-CH2Cl in THF and alk ali.Its fluorescence excitation maximum was 259nm and 366nm,while its fluorescence emission peak was from 370nm to 500nm.The HOMO and LUMO energy of the polymer was estimated from anodic and cathodic onset of cyclic voltammetry data to be-6.34eV,and-2.90eV respectively,the band gap was 3.44eV,while the optical band gap taken as the absorption onset of the UV-vis spectra was 3.38eV（λonset 367nm）.