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采用沉淀共聚法制备丙烯腈-对苯乙烯磺酸钠(AN-SSNa)共聚物,成膜酸化得到丙烯腈-对苯乙烯磺酸(AN-SSA)共聚物质子交换膜,研究了SSNa含量对AN-SSNa共聚物水溶性及SSA单元含量对AN-SSA共聚物质子交换膜吸水率、离子交换容量(IEC)、甲醇渗透率和电导率的影响。结果表明当共聚物中SSNa含量为0～4.7%(mol)时,AN-SSNa共聚物不溶于水;随着AN-SSA共聚物中SSA单元含量增大,质子交换膜的吸水率、IEC和甲醇渗透率均增大。用交流阻抗法测定AN-SSA共聚物质子交换膜的电导率,发现膜的电导率也随SSA含量增大而增大。定义膜的电导率与甲醇渗透率之比为膜的选择性系数,发现采用SSA含量为3.12%(mol)的AN-SSA共聚物制备的质子交换膜的选择性系数最大。
Abstract：Acrylonitrile-sodium styrenesulfonate(AN-SSNa) copolymers were synthesized by precipitation copolymerization,and protonated to obtain the proton-conducting acrylonitrile-styrenesulfonic acid(AN-SSA) copolymer membranes with different solfonation degrees.The influence of SSNa content in AN-SSNa copolymer on the solubility of the copolymer in water,and the influence of SSA content in AN-SSA copolymer on the water uptake,ion exchange capacity,methanol permeation coefficient and proton conductivity of AN-SSA copolymer membranes were investigated.It was found that the AN-SSNa copolymers with 0～4.7%(mol) SSNa could not be dissolved in water.All the water uptake,ion exchange capacity and methanol permeation coefficient of AN-SSA copolymer membranes increase with the increase of SSA content in the copolymers.The proton conductivity of AN-SSA copolymer membranes determined by AC impedance method also increases with the increase of SSA content in the copolymers.It was also found that the membrane prepared with AN-SSA copolymer containing 3.12%(mol) SSA has the maximum membrane selectivity which was defined as the ratio of the proton conductivity to methanol permeation coefficient of the membrane.
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基本信息:
中图分类号:TM914.4
引用信息:
[1]王盎然,包永忠,翁志学,等.丙烯腈-对苯乙烯磺酸共聚物质子交换膜的合成与性能[J],2010,24(05):871-875.