聚硅氧烷接枝乙烯基咔唑、十一烯酸乙酯聚合物的荧光光谱  

FLUORESCENCE SPECTRA OF POLYSILOXANE GRAFTED BY YINYL CARBAZOLE AND ETHYL UNDECYLENATE

作　　者：李桂芝[1] 

机构地区：[1]山东大学化学系,济南250100

出　　处：《高分子材料科学与工程》1999年第6期105-107,111,共4页Polymer Materials Science & Engineering

基　　金：山东大学国家教委胶体与界面化学开放实验室基金;山大化学院院长基金

摘　　要：研究了聚硅氧烷接枝乙烯基咔唑聚合物的氯仿稀溶液的荧光光谱，它在３７０ ｎｍ 处的单生色基团荧光峰的强度随溶液浓度的增加而减弱，当其生色基团的浓度为１．１９３×１０－ ３ ｍ ｏｌ／Ｌ时，除单生色基团荧光峰外，还出现由分子内相邻生色基团生成的激基缔合物峰；而在其固体的荧光光谱中仅出现一很强的激基缔合物荧光峰。顺丁烯二酸酐是聚硅氧烷接枝乙烯基咔唑聚合物稀溶液的有效淬灭剂，其淬灭规律符合Ｓｔｅｒｎ－Ｖｏｌｍ ｅｒ方程。接枝单体乙烯基咔唑、十一烯酸乙酯的摩尔配比为８∶２ 及５∶５ 的聚硅氧烷接枝共聚物的稀溶液荧光光谱中均呈现一单生色基团荧光峰，而它们的固体薄膜的荧光光谱中仅出现一很强的激基缔合物荧光峰，在该类无规接枝共聚物的固体中，激基缔合物可在分子内不相邻生色基团间及分子间、生色基团间生成。Intensity of mono chromophore fluorescence peak of polysiloxane grafted by vinyl carbazole dilute trichloromethane solutions decreases with an increase of chromophores (carbazole) content. Both mono chromophore and excimer peaks are observed in the fluorescence spectrum of this grafted polymer solution(1.193×10 -3 mol/L) and excimers form between adjacent chromophores in the same chain. Only excimer peak with high intensity is observed in fluorescence spectrum of this grafted polymer solid. Maleic anhydride is an effective quencher of the grafted polysiloxane dilute solutions and the relation between intensity of mono chromophore peak and quencher content is well fitted with Stern Volmer equation. The mono chromophore peaks and indistinct excimer peaks are shown in fluorescence spectra of the dilution solutions of polysiloxane grafted by vinyl carbazole and ethyl undecylenate with 8∶2 and 5∶5 mole ratios. Only the excimer fluorescence peaks arising from excition coupling between non adjacent chromophors in the same chain or in different chains are observed in the fluorescence spectra of these grafted copolymers.

关 键 词：聚硅氧烷 乙烯基咔唑 接枝共聚 荧光光谱 

分 类 号：O631.24[理学—高分子化学]