采用Heck反应合成了3-甲基噻吩齐聚物及3-甲基噻吩与芴的交替和嵌段共聚物。用凝胶渗透色谱（GPC）、核磁共振谱（1H-NMR）、紫外-可见光谱和荧光光谱对所得聚合物进行了表征。结果表明,利用Heck反应成功地制备了上述聚合物。在溶液和薄膜状态下嵌段共聚物与交替共聚物的最大紫外吸收峰分别为414 nm、394 nm和428.5 nm、397nm。两种共聚物在薄膜状态下和氯仿溶液中的能隙宽度分别为2.21 eV、2.68 eV和2.46 eV、2.76 eV。在聚芴链中引入噻吩链段后,共聚物的紫外吸收和荧光发射峰均发生明显红移,且随噻吩结构单元数的增加红移程度变大,聚合物的能隙宽度逐渐变小。
The 3-methylthiophene oligomer,3-methylthiophene and fluorene block-and alter-copolymers were synthesized by Heck reaction.The copolymers were characterized by nuclear magnetic resonance（NMR） spectra and gel permeation chromatography（GPC）.The ultra-violet absorption peaks of the copolymers were red-shifted and the peak widths of half height were broadened when the 3-methylthiophene structural units were introduced into the copolymers.And band gaps for the 3-methylthiophene-block-fluorene copolymer and 3-methylthiophene-alter-fluorene in film state were 2.21 eV and 2.68 eV respectively,and those in THF solution were 2.46 eV and 2.76 eV,respectively.These show that introducing thiophene structural units into polyfluorene main chain can effectively broaden the UV absorption spectra and lower the band-gaps of the copolymers.
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