聚苯硫醚砜激基缔合物荧光光谱的研究

STUDY OF EXCIMER FLUORESCENCE SPECTRA OF POLYPHENYLENE SULFIDE SULFONE

研究了芳环在主链上的刚性高分子聚苯硫醚砜（ＰＰＳＳ）及ＰＰＳＳ－双酚Ａ无规共聚物在二氯甲烷溶液中的荧光光谱．实验结果表明，当ＰＰＳＳ溶液的浓度大于８．１×１０－５ｍｏｌ／Ｌ时，能由浓度效应证明，不仅有分子间的激基缔合物形成，而且随着外部光照射时间的增长，ＰＰＳＳ溶液中的激基缔合物可因分子链构象的变化而消失．在相同条件下，所得的ＰＰＳＳ－双酚Ａ无规共聚物的荧光光谱中，只有单分子荧光谱带，而无激基缔合物谱带。

The fluorescence spectra of polyphenylene sulfide sulfone (PPSS) with rigid chain and random PPSS Bisphenol A copolymer in CH 2Cl 2 have been studied.It is found that intermolecular excimer of the PPSS in CH 2Cl 2 is formed and demonstrated by concentration effects.When the concentration is more than 8.1×10 -5 mol/L,the fluorescence intensitive ratio of excimer to monomer ( I E/ I M) increases with increasing concentration,which shows the excimer interaction between intermolecular chain chromophores.It has been found that light irradiation of the PPSS solution for 50 min enables extinguishing of the intermolecular excimer,due to the changes of molecular chain conformation.Under the same conditions,intermolecular excimer can not be formed for random PPSS Bisphenol A copolymer.