摘要
文献[1]报道N-甲基-N-(2-甲基丙烯酰氧乙基)苯胺(MEMA)单体,由于同一分子中含有缺电子碳碳双键和给电子发色基团(芳叔胺氮上孤对电子),因此当链节克分子浓度相等时,单体的荧光强度要比其均聚物的荧光强度低得多,归之为单体“结构自猝灭”所致。这是由于共存在单体分子中的吸电子双键基团和给电子的荧光基团在光照下于分子内或分子间产生激基复合物所致。这种现象称为“结构自猝灭现象”。聚合物无双键存在,因而其荧光强度比单体高得多。
The fluoresence behavior of N(2-methacryloyloxyethyl)N-methy-p-toluidine(MEMT)monomer and its polymer has been investigated.It was ohserved that the mronomer's fluoresence emrssion intensity was always lower than that of its polymer.This phenomenon was ascribed to the"structural self-queching effect'".From the Stern-Volmer plots,the fluoresence quenching constant of PMEMT by different quenchers,i.e.,methacrylonitrile(MAN),acrylonitrile(AN)fumadinitrile(FN),tetracyanoethene(TCNE),methyl acrylate(MA),methyl methacrylate(MMA)were evaluated respectively.The more the electron-poor of monomers(quenchers)the higher values of fluoresence quenching constants were ohtained.MEMT itself would photo-induced AN polymerization.In the presence of benzophenone(BP)and under UV light irradiation,photo-induced graft copolymerization of AN onto PMEMT and P(ME-MT-co-MA)would take place.The grafted polymers obtained were characterized by FT-IR spectra.
作者
张璋华
丘坤元
痛彻新德
ZHANG Zhanghua;QIU Kunyuan;FENG Xinde(Department of Chemistry,Peking University,100871)
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
1993年第2期246-251,共6页
Acta Polymerica Sinica
基金
国家自然科学基金资助项目
关键词
荧光光谱
光诱
MEMA
丙烯腈
共聚
N-(2-methacryloyloxyethyl)-N-methyl-p-toulidine
Homopolymer and co-polyners
Fluoresence spectra
Fluoresence quenching
Photo-induced AN graft copolymerization
