含噁二唑类与咔唑类共聚物的合成与表征

Synthesis and characterization of copolymers incorporating oxadiazole and carbazole units

由2-苯基-5-〔甲基丙烯酰胺基取代苯基〕-1,3,4-噁二唑(OXD)与甲基丙烯酸乙基咔唑酯(CzE-MA)两种单体合成了含噁二唑和咔唑基团的无规共聚物。通过红外、核磁、紫外、荧光、热重、差示扫描量热,凝胶渗透色谱对聚合物进行了表征。测试结果表明共聚物有很好的溶解性,均可溶于常用的有机溶剂,如THF,CHCl2,CHCl3等,其分子量在16950～22500之间。有良好的热稳定性和很高的玻璃化转变温度(Tg=190～222℃),最大吸收波长在220～340nm之间,具有良好的荧光性,其荧光发射波长均在372～451nm范围内,是一类蓝紫色荧光聚合物。共聚物随着CzEMA组分的减少和OXD组分的增加,发射波长蓝移,其中以P(OXD8-CzEMA2)的荧光性最好,荧光量子产率高达0.70。

New non-conjugated random copolymers containing 2-phenyl-5-（methyl acrylamide-substituted phenyl）-1,3,4-oxadiazole（OXD） and methacry acid ester ethylcarbazole were successfully synthesized by free radical polymerization method.Characterized by FT-IR,1H-NMR,UV-Vis,fluorescence spectroscopy,TGA,DSC,and GPC.The test results showed that： the copolymers exhibited good solubility,such as THF,CHCl2,CHCl3 and so on,hight molecular weight（Mw=16950-22500）.Their weight loss was less than 5% on heating to about under nitrogen atmosphere.The DSC graph has only one glass transition,which represents there is no phase-separation in copolymer.The photoluminescence properties were characterized by UV absorption and fluorescence spectrum in detail.As well as good thermal stability and high glass transition temperature.The copolymers UV absorption range from 222 to 340nm.The copolymers have good fluorescence.Under UV excitation,these copolymers emitted bright blue purple fluorescence at about 372-451nm in THF solution.With units of oxadiazole increasing,fluorescence quantum yield of copolymers decreases.P（OXD8-CzEMA2） have good fluorescence,fluorescence quantum yield up to 0.70.