摘要
以聚砜(PS)和自制的1,4-二氯甲氧基丁烷(BCD)为氯甲基化试剂通过Fridel-Crafts烷基反应制备氯甲基化聚砜(CPS),紧接着氯甲基与2-萘酚-6,8-二磺酸钾(NSK)试剂通过亲核取代反应制备一种萘磺酸型磺化聚砜(PS-NS),在用红外和核磁氢谱充分表征的基础上制备一系列磺酸基团键合量不同的PS-NS质子交换膜(分别为PS-NS-1,PS-NS-2,PS-NS-3)重点研究温度对质子交换膜性能的影响规律。研究结果表明:由于亲水基团与疏水主链距离较远,能够形成类似于Nafion膜的微相分离结构,使得该质子交换膜在高磺化度下仍能保持高的尺寸稳定性,同时随着温度升高,质子交换膜的吸水率、溶胀性以及质子传导率增加,PS-NS-3在25℃和85℃的吸水率为21. 3%和42. 7%,但是溶胀率仅为22. 2%和50. 3%,与商业化Nafion115膜(24. 9%和55. 0%)的性能十分接近,表现出很好的尺寸稳定性。
The chloromethylated polysulfone(CPS)was obtained by introducing chloromethyl group onto backbone of PS with 1,4-bischloromethyoxyl butane as reagent.Subsequently with 2-naphthol-6,8-disulfonic acid dipotassium as reagent,the sulfonated poly-sulfone(PS-NS)was prepared by Fridel-Crafts alkylation reaction.A series of PS-NS PEMs(PS-NS-1,PS-NS-2 and PS-NS-3)with different bonding amount of sulfonic acid group were obtained after fully characterizing their structures by the FT-IR and 1 H-NMR.The effects of temperature on performance of PEMs were explored.The results showed that the PS-NS PEMs could form Micro-phase separation structure similar to Nafion membrane by locating the hydrophilic sulfonic acid group far away from hydrophobic polysul-fone main chain.So the PEMs could keep excellent size stability at high wateruptaking.The wateruptaking,swelling ratio and proton conductivity of PEMs were increased with temperture increasing.The reaction was allowed to be carried out at 100℃for 40 h with dimethyl sulfoxide as solvent.The bonding amount of sulfonate acid group was up to 1.57mmol·g-1.The proton exchange mem-branes(PEMs)were fabricated by solution casting method.The wateruptaking and proton conductivity of PEMs increased with the bonding amount increasing.The PS-NS-3 PEMs showed excellent size stability that the swelling ratio of were only 22.2%at 25℃and 50.3%at 85℃when the wateruptaking were 21.3%and 42.7%.And the swelling ration was closed to the commercialization Nafion115 membranes(24.9%at 25℃and 55.0%at 85℃).
作者
乔宗文
闫晓前
QIAO Zong-wen;YAN Xiao-qian(Collaborative Innovation Center of Department of Chemical Engineering,Shaanxi Institute of Technology,Xian 710300,China)
出处
《化学研究与应用》
CAS
CSCD
北大核心
2018年第12期1993-1998,共6页
Chemical Research and Application
基金
陕西省教育厅自然科学专项(18JKO069)资助
关键词
聚砜
萘磺酸
相分离结构
尺寸稳定性
吸水率
Polysulfone
Naphthalenesulfonic acid type
Micro-phase separation
Dimensional stability
wateruptaking
