烷基取代聚对亚苯基亚乙烯基衍生物的合成和性质研究

设计了一种合成烷基取代聚对苯撑乙烯 (PPV)衍生物的新方法 ,合成了一种新的烷基取代PPV 聚(2 甲基 5 十二烷基对苯撑乙烯 ) ,并用NMR、IR、GPC、元素分析等方法对化合物进行了表征与鉴定 .同时 ,测试了化合物的热学性质、紫外可见吸收和光致荧光性质 .发现化合物的玻璃化温度和第一分解温度随着共轭程度的增加而升高 ;化合物的THF稀溶液的光致荧光相对量子产率随共轭程度的降低而增加

SYNTHESIS AND PROPERTIES OF ALKYL SUBSTITUTED POLY(1,4-PHENYLENEVINYLENE DERIVATIVES

A new synthetic route was designed for synthesizing the luminescent polymers of alkyl substituted poly(1,4 phenylenevinylene) derivatives (alkyl\|PPV).The monomer of the polymers was synthesized by two steps:first,using Li\-2CuCl\-4 to catalyze cross\|coupling of aryl grignard reagent with alkyl halides to introduce alkyl long\|chained substituents to benzene ring,second,using SnCl\-4 to catalyze chloromethylation of the alkyl long\|chained substituted benzene.The yield of the monomer synthesized by this method was much higher than that by any other methods that were ever reported.The polymerization of the monormer was carried out by using t \|BuOK to remove HCl. Poly(2 \|dodecyl\|5\|methyl\|1,4\|phenylenevinylene) was synthesized with that synthetic route.The structure and properties of the polymers were identified and characterized by IR,UV\|Vis,luminescent spectra,GPC,thermal(DSC and TGA) and elemental analysis.It was found that the glass transition temperature increases and the photoluminescent relative quantum yield decreases with the increase of the conjugation extent of the polymers,and the photoluminescent relative quantum yield of the polymers can be as high as 78%.