摘要
由羟基乙叉二膦酸(HEDP)和(3-异氰酸丙基)三乙氧基硅烷(IPTS)合成的膦酸基硅氧烷被掺杂进磺化聚醚醚酮(SPEEK)基体中,并采用溶胶–凝胶法制备出了一系列质子交换膜材料。膜的结构特点通过傅立叶变换红外光谱和扫描电子显微镜进行研究。结果表明,HEDP以C—O—C键的形式成功地固定于IPTS水解缩聚形成的Si—O—Si交联网络中且膦酸基硅氧烷(HEDP–IPTS)在SPEEK基体中均匀分布。所制备的膜还展现出优异的抗氧化性、力学性能和尺寸稳定性,甚至热稳定性可达225℃。此外,得益于磺酸基团和膦酸基团这两种质子传导单元的存在,膦酸基硅氧烷中P∶Si为3∶4的WPEM–3膜在80℃、相对湿度100%和140℃、相对湿度10%条件下的质子电导率分别达到11.42×10^(–2) S/cm和5.59×10^(–2) S/cm。该新型膜材料有望在宽温域运行环境中展现出巨大的潜力。
A series of proton exchange membranes of incorporating phosphonic acid functionalized siloxane from 1–Hydroxyethylidene- 1,1-diphosphonic acid (HEDP) and 3–Isocyanatopropyltriethoxysilane (IPTS) into the matrix of sulfonated poly (ether ether ketone)(SPEEK) were prepared by sol-gel methods. The structural characteristics of membranes were investigated using FTIR and SEM,indicating that HEDP was successfully immobilized into cross-linking networks of Si-O-Si formed by hydrolysispolycondensation of IPTS in the form of C-O-C bond,and phosphonic acid functionalized siloxane (HEDP–IPTS) was dispersed uniformly in polymeric matrix. The obtained membranes also exhibite superior oxidative resistance,mechanical properties and dimensional stability,even the thermal stability is up to 225℃. Moreover,benefiting from the existence of dual proton conducting units of sulfonic acid groups and phosphonic acid groups,the proton conductivities of WPEM–3 membrane whose molar ratio of P to Si is 3∶4, reaches 11.42×10^–2 S/cm at 80℃ and relative humidity (RH) of 100%,5.59×10^–2 S/cm at 140℃ and relative humidity (RH) of 10%,respectively. Therefore,this novel membrane materials will act as a potential candidate operating at wide temperature environment.
作者
朱希
沈春晖
金怀洋
程向泽
Zhu Xi;Shen Chunhui;Jin Huaiyang;Cheng Xiangze(School of Material Science & Engineering,Wuhan University of Technology,Wuhan 430070,China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2019年第4期11-18,共8页
Engineering Plastics Application
关键词
磺化聚醚醚酮
膦酸基硅氧烷
双重质子导体
质子交换膜
sulfonated poly(ether ether ketone)
phosphonic acid functionalized siloxane
dual proton conductors
proton exchange membranes
