磺化聚苯乙烯/聚(5-乙烯基四氮唑)共混质子交换膜的制备及其热稳定性和电导率

Preparation of sulfonated polystyrene/poly(5-vinyl tetrazole) blended proton exchange membrane and evaluation of its thermal stability and electric conductivity

分别制备了腈基转化率为85%的聚(5-乙烯基四氮唑)(简记为PVTra)和磺化度为72%的磺化聚苯乙烯(简记为SPS);将二者以不同的比例共混制备成质子交换膜;利用傅立叶变换红外光谱、热重分析、差示扫描等研究了薄膜的结构和热稳定性,并采用电化学工作站测定了其电导率.结果表明,共混薄膜的玻璃化转变温度为150℃左右,热分解温度为200℃左右;当薄膜的磺酸根与四唑环的物质的量之比为2∶1时,其在100℃和120℃下的电导率分别达1.23×10-2 S/cm和4.40×10-2S/cm.

Poly（5-vinyl tetrazole） （denoted as PVT） with nitrile conversion rate of 85% and sulfonated polystyrene （denoted as SPS） with sulfonation degree of 72% were prepared. As prepared PVT and SPS were then mixed to prepare blend membranes for proton exchange. The structure and thermal stability of as-prepared proton exchange membranes were analyzed by Fourier transform infrared spectrometry and thermogravimetric analysis as well as differential scanning calorimetry. The electric conductivity of the blended proton exchange membranes was evaluated using an electrochemical workstation. Results show that as-prepared proton exchange membrane has a glass transition temperature of about 150℃ and thermal decomposition temperature of about 200℃. When the molar ratio of sulfonate to tetrazole is 2 ~ 1, relevant blended proton exchange membrane has an electric conductivity of 1.23×10^-2S/cm and 4.40×10^-2Scm at 120 ℃.