摘要
通过共混的方法制备了含倍半硅氧烷(POSS)星型拓扑结构的嵌段共聚物POSS-(PMMA26-b-SPS156)8/聚偏二氟乙烯(PVDF)复合质子交换膜。通过研究复合膜的离子交换容量(IEC)、质子传导率、吸水率、溶胀率及其在低湿度下的自旋-自旋弛豫时间(T2),考察了PVDF含量对复合膜性能的影响。结果表明,随PVDF添加量的增加,质子交换膜的IEC、吸水率和溶胀率降低,在测定温度下复合膜尺寸稳定性提高;PVDF还可以提高共聚物膜在高温下的电导率,降低膜对湿度的依赖性;在湿度30%,温度80℃时,添加PVDF50%的复合膜比纯共聚物膜的质子传导率高约1个数量级;由复合质子交换膜结合水的状态差异剖析了复合膜在低湿度下质子传导率高的原因。
Blend proton exchange membranes were prepared from blending polyhedral oligomeric silsesquioxane （POSS） containing star-shaped block copolymer POSS-（PMMA26-b-SPSls6）8 with polyvinylidene fluoride （PVDF）. The effect of PVDF content on the properties of blend membrane was investigated, ion exchange capacity（IEC）, proton conductivity and water uptake, swelling rate and spin-spin relaxation time（T2） of the blend PEM were studied. The results shows that IEC, water uptake and swelling rate decrease with adding PVDF amount in blend membranes. Blend proton exchange membrane shows higher dimensional stability. The proton conductivity of blend PEM shows a continuous increasing with adding different ratio of PVDF. The dependence of proton conductivity on relative humidity is reduced owing to adding PVDF. It is found that proton conductivity of 50% PVDF blend membrane is higher about one order of magnitude than that of pure copolymer membrane in 30 % RH at 80 ℃ . The reason of proton conductivity which is enhanced at low RH was investigated by comparing relaxation time T2 of different binding water via low field NMR.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2015年第9期63-68,共6页
Polymer Materials Science & Engineering
基金
国家自然科学基金(青年科学基金)资助项目(51103117)
陕西省自然科学基金资助项目(2013JQ2010
2013JM2012)
西北工业大学中央高校基本科研业务费基础研究基金项目(3102014JCQ01089)
