界面聚合法合成聚联苯胺及其衍生物

Effects of Ringsubstituted Groups on the Properties of Facial Synthesized Polybenzidine

采用界面聚合法合成了聚联苯胺,聚(3,3-二甲氧基联苯胺)和聚(3,3-二甲基联苯胺).利用红外光谱(FT-IR),紫外可见吸收光谱(UV-v is),电子扫描显微镜(SEM),X-射线衍射(XRD),循环伏安(cyclic vo ltam-ogram)等测试方法,对聚合物进行了表征.从环取代基的电子效应和立体效应以及界面聚合反应的特点,初步探讨了环取代基对界面聚合法合成的聚合物分子链的结构,结晶性,颗粒形貌以及电化学活性的影响.结果表明,界面聚合法合成聚联苯胺表现出尺寸在微米范围内的棒状分布,在紫外可见吸收光谱中,相对于聚联苯胺,聚(3,3-二甲氧基联苯胺)的吸收峰发生红移.聚(3,3-二甲氧基联苯胺)的结晶性在三种聚合物中相对较好.聚(3,3-二甲氧基联苯胺)的氧化还原峰电位与其余两种聚合物相比,有负移.说明界面聚合得到的聚合物的分子链的结构,结晶性,颗粒形貌以及电化学活性由环上取代基的电子效应和立体效应不同而有所变化.

Polybenzidine, poly（ o -dianisidine） and poly（ o -tolidine） were synthesized directly synthesized by using facial synthesis method. The FTIR spectra, UV-vis absorption spectra and X-ray diffraction patterns were used to characterize the molecular structures of these polymers. The morphologies of powders of these polymers were studied by SEM. Voltammetric study was done to investigate the electrochemical behaviors of all these polymers. The relations between ring-substituted groups and the structure, crystallinity, morphology and electrochemical activity of these polymers were discussed by the electronic effects and steric effects of ring-substituted groups and characteristic of facial synthesis. UV-vis absorption spectra showed there is a red shift in the absorption band of poly（o-dianisidine） comparing with the others. X-ray diffraction patterns showed the most diffraction peaks appeared in poly（o-dianisidine） which meant it was more highly ordered than the other two polymers. SEM studies revealed a variation in the morphological structure of these polymers, polybenzidine particles appears as small chopped or needle shaped fibers in the micrograph. Voltammetric study indicated was better electrochemical activity than the other two polymers. All these results meant that the properties of polybenzidine synthesized by using facial synthesis method was varied by the electronic effects and steric effects of ring-substituted groups.