聚合条件对PEDT导电性及相对分子质量的影响

Influence of synthesis conditions on the electrical conductivity and relative molecular mass of PEDT

采用化学原位氧化聚合法制备了导电聚合物3,4-聚乙烯二氧噻吩(PEDT)薄膜。系统研究了不同工艺条件对聚合物电导率的影响。发现单体与氧化剂体积比为1∶4、溶剂含量90%(体积分数)、加入聚合改良剂0.5%(体积分数)、反应温度–5℃时可以获得较高电导率(>20S/cm)薄膜。首次结合元素分析法,研究了工艺条件对聚合物相对分子质量的影响,结果表明,聚合温度25℃,ψ(单体:氧化剂:聚合改良剂)=1∶4∶2的条件下,所合成的PEDT可获得最大平均相对分子质量(1068)和聚合度(7.6),并对相应的机理进行了探讨。

Conducting poly（3, 4-ethylene dioxythiophene） film was prepared by in situ chemical oxidation method. The influences of different process factors on the film electric conductivity were investigated. The results show that the higher conductivity film （〉20 S/cm） can be obtained through following polymerization conditions： an 1 ：4 volume ratio of monomer to oxidizer, 90% volume fraction of solvent, 0,5% volume fraction of accelerant, and -5℃ of polymerization temperature. Furthermore, with the assistance of element analysis method, the influence of process condition on mean relative molecular mass of synthesized PEDT was studied firstly and the result show that maximum mean relative molecular mass（1 068） and polymerizing degree （7.6） could be obtained with an volume ratio of monomer to oxidizer and to accelerant about 1 ： 4 ： 2, and 25℃ of polymerization temperature. The corresponding mechanisms about PEDT characteristics were also discussed.