苯环侧基磺化聚芳醚砜质子交换膜的制备及性能研究∗

摘要

以1,1-二(4-羟苯基)-1-苯基乙烷,对苯二酚和4,4’-二氯二苯砜为单体,通过亲核取代反应,制备出一系列带有苯环侧基的聚芳醚砜共聚物。以氯磺酸为磺化剂对聚合物进行磺化得到了磺酸基在苯环侧基上的磺化聚芳醚砜树脂。用红外光谱(FT-IR),核磁共振谱(1 H-NMR)表征了聚合物结构。通过观察透射电镜发现离子簇无规律地分散在膜中。性能测试结果表明,这些侧链磺化的质子交换膜具有优异的耐热性、机械性能,高的电导率及低的甲醇渗透率。%Poly(aryl ether sulfone)copolymers (Co-PSFs)containing sulfonated phenyl pendent groups are syn-thesized through nucleophilic aromatic substitution polycondensation by using 1 ,1-Bis(4-hydroxyphenyl)-1-phe-nylethane,hydroquinone and 4,4’-dichlorodiphenyl sulfone,followed by postsulfonation with chlorosulfonic acid at 0 ℃.The chemical structures of sulfonated poly(arylene ether sulfone)s copolymers (SCo-PSFs)are characterized by IR and 1 HNMR spectra.These ionomers generally show good thermal stability with glass tran-sition temperaturesand initial degradation temperature.Transmission electron microscopic observations reveal that SCo-PSFs membranes form well-defined microphase separated structures.The samples have moderate me-chanical property with Young’s modulus of 0.29-1.10 GPa and SCo-PSF100 with the IEC value 1.65 mmol/g shows conductivity of 1.2×10-1 S/cm at 80 ℃ and the methanol permeability values of membranes at room temperature were in the range of 2.15 × 10-7 to 5.49 × 10-7 cm2/s at 20 ℃.