含3，4-乙撑二氧取代基的聚三噻吩衍生物的合成与表征

Characterization and Synthesis of Polyterthiophenes Containing 3,4-Ethylenedioxythiophene(EDOT)

摘要: 通过Stille反应合成了3′, 4′-乙撑二氧2, 2′∶5′, 2″-三噻吩，并以其作为单体，在0～5 ℃下，以FeCl3为氧化剂，在氯仿溶液中合成了3种聚（3′, 4′-乙撑二氧2, 2′∶5′, 2″-三噻吩）。并采用紫外-可见光谱（UV-Vis）、傅里叶红外光谱（FT-IR）、凝胶色谱（GPC）、循环伏安（CV）、透射电镜（TEM）和热重分析（TGA）对聚合物进行了表征。同时讨论了乙撑二氧取代基和FeCl3用量对聚合物性质的影响。结果表明：聚合物的紫外最大吸收为466～474 nm，数均分子量为3.4×103～3.6×103，能隙大约为2.05 eV，热分解温度为110 ℃。

Abstract: An ethylenedioxy group substituted terthiophene derivative (3′, 4-ethylenedioxy2, 2′∶5′, 2″-terthiophene, TET) was synthesized via Stille reaction， and the related polythiophene derivatives (poly(3′, 4′-ethylenedioxy2, 2′∶5′, 2″-terthiophene), PTET) were obtained by oxidation polymerization with different dosage of FeCl3 as catalysts at 0—5 ℃. These polymers were characterized by UVVis、FT-IR GPC、CV、TEM and TGA analysis. The number average molecular weights (Mn) of these polymers are 3.4×103—3.6×103. These polymers exhibit good thermal stability with thermal decomposition temperatures above 110 ℃. UV-Vis spectroscopy indicates low bandgaps (2.05 eV) of these polymers, and the maximum absorption is 466—474 nm.