燃料电池用季铵化聚乙烯醇与羟基磷灰石阴离子膜

以季铵化聚乙烯醇(QPVA)和羟基磷灰石(HA)为原料制备了燃料电池用阴离子复合膜,对膜材料分别进行了红外光谱(FT-IR)结构表征和热失重(TGA)分析.结果显示,HA的引入将复合膜的热分解温度提高了约30℃.对不同HA掺杂量的一系列阴离子复合膜的物理化学性能指标的测试表明,HA的掺杂改善了复合膜的溶胀率和断裂拉伸强度,减缓了升温条件下因水蒸发导致的膜电导率的下降;但复合膜的离子交换量有所降低.当HA的掺杂量(质量分数)由0增加到75.0%时,相应复合膜的体积溶胀率由105.5%降低为55.5%;拉伸强度由47.9 MPa提高到69.5 MPa;离子交换量则由0.72 mmol/g降低为0....

Anion Exchange Membranes Based on Quaternized Poly(vinyl alcohol) and Hydroxyapatite for Fuel Cells

Hybrid anion exchange membranes of quaternized poly(vinyl alcohol)(QPVA) and hydroxyapatite(HA) were prepared and characterized by FT-IR(Fourier transform infrared spectroscopy) and TGA(thermogravimeteric analysis),respectively.Physical chemical properties of the hybrid membranes were investigated.The results indicated that the decomposition temperature of the hybrid membranes is increased about 30 ℃ comparing with that of QPVA.The presence of HA in the hybrid membranes decreases the membrane swelling,improves the membrane strength,and alleviates the decrease in conductivity of the hybrid membrane due to the water evaporation at elevated temperatures.With the increasing of HA in the hybrid membrane from 0 to 75.0%,the volume swelling decreases from 105.5% to 55.5%,the tensile strength increases from 47.9 to 69.5 MPa,and the IEC decreases from 0.72 mmol/g to 0.54 mmol/g,respectively.