用激基缔合物荧光研究聚苯乙烯-聚甲基丙烯酸甲酯嵌段共聚物在溶液中的分子构型

Study on Molecular Configuration of Poly(Styrene b methyl methacrylate) in Solution by Excimer Fluorescence Technique

用激基缔合物荧光研究聚苯乙烯－聚甲基丙烯酸甲酯嵌段共聚物在溶液中的分子构型赵汉英＊雷中立宋法江黄葆同（中国科学院长春应用化学研究所长春１３００２２）关键词聚苯乙烯－聚甲基丙烯酸甲酯嵌段共聚物，荧光，激基缔合物，胶束１９９６－０９－０４收稿，１９９６－...

Excimer fluorescence was used to probe the change of fluorescence intensity ratio of excimer/monomer chromophore I E/ I M of poly(S b MMA) with concentration in THF solution. Three concentration regions are recognized in the range studied with respect to the values of I E/ I M. In region Ⅰ, the values of I E/ I M are independent of the concentration of the solution. In region Ⅱ, the I E/ I M values increase with the increase of concentration. In region Ⅲ, the values of I E/ I M almost keep constant. This phenomenon is attributed to the shrinkage of polymer coils and the entanglement of polymer chains at high concentration. The formation of micelles of the block copolymer in THF solution on addition of acetone was also studied. The change of I E/ I M values indicates that the PS chains act as core and the PMMA chains as the corona.