硫酸氢盐液晶原位聚合膜的制备及其无水质子传导研究

Preparation of Bisulfate Liquid Crystal in situ Polymer Film and Its Anhydrous Proton Conduction Characteristics

以环己基苯酚为液晶基元,通过取代反应制备3-(6(4-(反式-4-戊基环己基)苯氧基)己基)-1-乙烯基咪唑-3-硫酸氢根离子液晶。采用傅里叶变换红外光谱(FT-IR)和核磁氢谱(1H NMR)对其分子结构进行表征。通过原位聚合将其固化成膜,并测试得到了中温区间(100~160℃)的无水质子传导率随温度的变化曲线。结果表明,传导过程主要基于Grotthuss机理,即质子传导过程主要是靠质子在硫酸氢根间的跳跃完成的。光聚作用让链段摆动受到了束缚,使得聚合物膜在160℃时的最高传导率(3.79×10^-6 S/cm)低于相同温度下单体的最高传导率(2.37×10^-5 S/cm)。

3-(6-(4-4-Pentylcyclohexyl)phenoxy)hexyl)-1-vinylimidazol-3-hydrogensulfate was prepared based on cyclohexyl phenol mesogen by substitution reaction. Its structure was characterized by FT-IR and 1 HNMR spectra. The membrane was formed through in situ UV photo-polymerization. Anhydrous proton conductivities in the medium temperature range(100~160 ℃) were electrochemically measured. The result showed that the conduction process was dominated by the Grotthuss mechanism. The mobility of molecules was constrained because of the polymerization,and the highest conductivity of polymer membrane was 3.79×10^-6 S/cm at 160 ℃, which was lower than that of the monomer(2.37×10^-5 S/cm) at the same temperature.