Proton-conducting nanocomposite membranes based on P(VDF-co-CTFE)-g-PSSA graft copolymer and TiO₂–PSSA nanoparticles

详细信息    查看全文

• 作者：Jung Tae Park^a ; Joo Hwan Koh^a ; Dong Kyu Roh^a ; Yong Gun Shul^a ; Jong Hak Kim ; ^a ; ^{jonghak@yonsei.ac.kr}
• 关键词：Graft polymerization ; TiO₂ nanoparticle ; Atom transfer radical polymerization (ATRP) ; Proton conductivity ; Polymer electrolyte membranes
• 刊名：International Journal of Hydrogen Energy
• 出版年：2011
• 出版时间：January 2011
• 年：2011
• 卷：36
• 期：2
• 页码：1820-1827
• 全文大小：547 K

文摘

Bifunctional TiO₂ nanoparticles with hygroscopic and proton-conductive properties were synthesized by grafting proton-conducting polymer, i.e. poly(styrene sulfonic acid) (PSSA) from TiO₂ nanoparitlces via surface-initiated atom transfer radical polymerization (ATRP). These bifunctional TiO₂–PSSA nanoparticles were blended with poly(vinylidene fluoride-co-chlorotrifluoroethylene)-graft-poly(styrene sulfonic acid), i.e. P(VDF-co-CTFE)-g-PSSA to give proton-conducting membranes for high temperature fuel cells. FT-IR, UV–visible spectroscopy and X-ray diffraction (XRD) results revealed bifunctional properties of TiO₂–PSSA nanoparticles due to successful grafting of PSSA chains. Ion exchange capacity (IEC) of P(VDF-co-CTFE)-g-PSSA/TiO₂–PSSA membranes was not significantly changed irrespective of TiO₂–PSSA concentrations, representing almost fixed SO₃⁻ concentration in the membranes. In contrast, water uptake and proton conductivity of membranes continuously increased with increasing TiO₂–PSSA concentrations, presumably due to hygroscopic, soft conducting property of nanoparticles. The results of thermal gravimetric analysis (TGA) also showed that all the membranes were stable at least up to 280 °C.