六氯化钨/正丁基三苯基锡催化聚苯乙炔的制备及荧光性能研究

Fluorescence Properties of Copolymers of C_(60) and Phenylacetylene

使用新型WCl6-n -BuPh3 Sn催化体系聚合苯乙炔 ,获得了高产率和高分子量的聚苯乙炔。研究了不同聚合溶剂对聚合物结构及分子量影响 ,使用UV、IR、NMR、GPC等分别对聚合物结构进行表征。采用不同波长的激发光对聚合物荧光性能进行详细研究 ,结果表明 :在低于 2 90nm和高于 40 0nm激发光波长 ,聚合物几乎不呈现荧光性能。当聚合物在 3 5 0nm被激发时呈现较强发光量子效率。对聚合物溶液荧光性能的研究表明 :当溶液浓度低于 0 .1g/L时 ,聚苯乙炔发光强度与溶液浓度成正比 ,在溶液浓度高于 0 .1g/L ,例如 0 .5 g/L时呈现出浓度自猝灭效应。同时 ,从荧光性能研究显示这种催化剂获得的聚合物具有较差的规整性。

In the paper, polyphenylacetylenes were synthesized using the new catalyst system of WCl 6/n-BuPh 3Sn in different solvents. The polymers with high yield and high weight-average molecular weight were obtained.Their structures were characterized by UV,IR, NMR and GPC,respectively. The fluorescences of the polymer using variable excitation wavelength from UV to visible region were investigated. At excitation wavelength lower than 290nm and higher than 400nm,absence of fluorescence was observed, high yield of fluorescence was obtained when the polymer was excited at ca. 350nm. The fluorescences of polymer solution in THF showed concentration-quenching effect of polymer in the solution of 0.5g/L. The highest yield was exhibited in the polymer solution of 0.1g/L.Simultaneously,the fluorescence also shows the uneven polymer structure.