聚4-乙烯吡啶基碱性膜的制备及性能分析

采用自由基聚合制备聚4-乙烯吡啶(P4VP)。引入溴乙醇(BE)对制备的P4VP进行季铵化处理,合成一系列不同季铵化取代度的季铵化聚4-乙烯吡啶(QPVPE),最后,引入戊二醛(GA)与QPVPE进行交联,制备得到适合燃料电池使用的交联型聚4-乙烯吡啶基碱性膜。实验过程中,借助傅里叶变换红外光谱(FTIR)、紫外光谱(UV)、扫描电子显微镜(SEM)、热重分析(TGA,DTG)及力学性能测试等分析手段,对得到的导电膜结构及其理化性能进行分析,并对其导电性能进行性能测试。结果表明,QPVPE77.6%-GA16.87%膜综合性能最佳,该膜的电导率为10.48 mS/cm、含水率(WU)86.4%、溶胀率(SR)66.8%、拉伸强度为23.97 MPa。在25℃条件下,于1 mol/L的KOH溶液中浸泡192 h后,电导率损失为19%。因此,该膜具有较好的耐碱性能。

Preparation and Characterization of Poly( 4-vinylpyridyl) Basic Membranes

Poly 4-vinylpyridine(P4VP)was prepared by free radical polymerization.The quaternization of the prepared P4VP was carried out by introducing bromoethanol(BE),synthesizing a series of quaternized poly(4-vinylpyridine)(QPVPE)with different degrees of quaternization,and finally introducing glutaraldehyde(GA)to QPVPE.In combination,a crosslinked poly(4-vinylpyridyl)basic film suitable for use in a fuel cell was produced.During the experiment,the structure of the obtained conductive film was obtained by means of Fourier transform infrared spectroscopy(FTIR),ultraviolet spectroscopy(UV),scanning electron microscopy(SEM),thermogravimetric analysis(TGA,DTG)and mechanical property testing.Its physical and chemical properties were analyzed,and its conductivity was tested.The results showed that QPVPE77.6%-GA16.87%membrane had the best comprehensive performance.The conductivity of the membrane was 10.48 mS/cm,the water content(WU)was 86.4%,and the swelling The rate(SR)was 66.8%and the tensile strength was 23.97 MPa.The conductivity loss was 19%after immersion for 192 h at 25℃in 1 mol/L KOH solution,indicating that the film had good alkali resistance.