以离子液体(氯化-1-丁基-三甲基咪唑, BMIMCl)溶解微晶纤维素(MCC),以 N,N-亚甲基双丙烯酰胺作为交联剂形成的纤维素水凝胶为基体,同时吡咯(Py)作为导电聚合物单体,制备了纤维素基导电水凝胶。对MCC/PPy复合导电水凝胶的化学结构和表面形貌进行了表征,研究了该导电水凝胶的导电性、溶胀性能和热稳定性。结果表明,PPy 与 MCC 水凝胶形成了具有半互穿网络结构的导电水凝胶,该水凝胶表面呈蜂窝状；其电导率数量级可达10-4~10-3,且对甲苯磺酸钠掺杂可大幅提高其电导率；随着MCC浓度的增加,纤维素水凝胶的平衡溶胀率呈下降趋势,所得导电水凝胶的溶胀率比纯纤维素水凝胶的溶胀率略有下降,但仍能维持500%的水平；此外,该导电水凝胶的热稳定性较纯MCC水凝胶有所下降。
A kind of novel MCC/PPy composite hydrogel has been prepared using the cross-linking network of microcrystalline cellulose (MCC)as the matrix of the hydrogel,which was dissolved in ionic liquid (chloride-1-butyl-3-methylimidazolium,BMIMCl)and cross-linked by N,N-methylene-bis-arcylamide,and pyrrole (Py)as the monomer of conductive polymer.The chemical structure and morphology of the MCC/PPy composite hy-drogel were characterized by FT-IR and SEM,meanwhile,the conductivity,swelling ratio and thermal stability were studied.Results showed that the MCC/PPy composite hydrogel was semi-IPN conductive hydrogel with honeycomb-like structure.Conductivity of the composite hydrogel was between 10-4-10-3 S/cm,and doping of TsONa increased the conductivity significantly.The equilibrium swelling ratio (ESR)decreased with higher MCC content for both pure MCC hyrogel and the composite hydrogel;and ESR of the composite hydrogel could maintain at the level of 500% which was lower than that of the pure MCC hydrogel.Besides,the thermal sta-bility of the composite hydrogel was reduced than the pure MCC hydrogel.
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