以聚砜为基础材料,基于后磺化法构筑一种具有较长侧链的交联型聚砜阴离子交换膜,并通过FT-IR对其结构进行表征,研究了阴离子交换膜的吸水率、质子传导率和尺寸稳定性等性能与温度之间的变化关系。结果表明,由于亲水季铵基距离主链较远,强化了阴离子交换膜的相分离结构,同时形成一种三维网状结构,使得所制备的聚砜阴离子交换膜在高质子传导率下仍能保持很好的尺寸稳定性和耐碱性,其中IEC为1.56 mmol/g的CPS-HN-3膜在室温和85℃的吸水率达到了39.6%和61.6%,高于商业化Nafion115和Nafion117膜,但是吸水溶胀性仅为5.1%和11.7%,氢氧根离子传导率达到了38 mS/cm和89 mS/cm,该膜在强碱中浸泡600 h的传导率保留量达到了83.9%。

A crosslinked polysulfone (PSF) anion exchange membrane (AEM) with long side chain is constructed based on post-sulfonation method with PSF as substrate material.The structure of AEM is characterized by FT-IR.The relationship between water absorption,proton conductivity and dimensional stability of AEM respectively and temperature is deeply studied.It is found through experiment results that the phase separation structure of AEM is strengthened by locating the hydrophilic quaternary ammonium group far away from main chain.In addition,a three-dimensional network structure enables the prepared polysulfone AEM to maintain good dimensional stability and alkali resistance at high proton conductivity.The water absorption rates of CPS-HN-3 AEM with an IEC of 1.56 mmo·g^-1 at room temperature and 85℃ are 39.6% and 61.6%,respectively,which are higher than those of commercial Nafion115 and Nafion117 membranes.But the swelling ratio of CPS-HN-3 AEM are only 5.1% and 11.7%,respectively at room temperature and 85℃,and the hydroxide ions conductivity reaches 38 mS·cm^-1 and 89 mS·cm^-1.The conductivity of CPS-HN-3 AEM retains 83.9% after it has been soaked in strong alkali for 600 h.