Single-step synthesis of proton conducting poly(vinylidene fluoride) (PVDF) graft copolymer electrolytes
2008; Elsevier BV; Volume: 44; Issue: 3 Linguagem: Inglês
10.1016/j.eurpolymj.2007.12.020
ISSN1873-1945
AutoresYong‐Woo Kim, Do Kyoung Lee, Kyung Ju Lee, Jong Hak Kim,
Tópico(s)Membrane Separation and Gas Transport
ResumoThe single-step synthesis of proton conducting poly(vinylidene fluoride) (PVDF) graft copolymer electrolytes is demonstrated. The graft copolymers of PVDF backbone with poly(sulfopropyl methacrylate) (PVDF-g-PSPMA) and poly(styrene sulfonic acid) (PVDF-g-PSSA) were synthesized using PVDF as a macroinitiator for atom transfer radical polymerization (ATRP). 1H NMR and FT-IR spectroscopy show that the "grafting from" method using ATRP was successful and the maximum grafting degrees were 35 and 25 wt% for PVDF-g-PSPMA and PVDF-g-PSSA, respectively. The IEC values were 0.63 and 0.45 meq/g, the water uptakes were 46.8 and 33.4 wt% and the proton conductivities were 0.015 and 0.007 S/cm at room temperature, for PVDF-g-PSPMA and PVDF-g-PSSA, respectively. Both membranes exhibited excellent thermal stability up to around 350 °C, verified by thermal gravimetric analysis (TGA).
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