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Enhancement of ionic conductivity and structural properties by 1‐butyl‐3‐methylimidazolium trifluoromethanesulfonate ionic liquid in poly(vinylidene fluoride–hexafluoropropylene)‐based polymer electrolytes
Author(s) -
Ramesh S.,
Lu SoonChien
Publication year - 2012
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.36790
Subject(s) - trifluoromethanesulfonate , hexafluoropropylene , ionic liquid , ionic conductivity , differential scanning calorimetry , materials science , polymer chemistry , fourier transform infrared spectroscopy , polymer , fluoride , lithium (medication) , chemical engineering , electrolyte , chemistry , copolymer , inorganic chemistry , organic chemistry , composite material , thermodynamics , medicine , physics , electrode , tetrafluoroethylene , engineering , endocrinology , catalysis
Polymer electrolytes (PEs) with poly(vinylidene fluoride–hexafluoropropylene) [P(VdF–HFP)] as the polymer host and doped with lithium trifluoromethanesulfonate (LiTf) and 1‐butyl‐3‐methylimidazolium trifluoromethanesulfonate (BMIMTf) were synthesized via a solution casting method. This P(VdF–HFP)/LiTf/BMIMTf‐based PE achieved about 1.8 ×10 −3 S/cm at room temperature with 100 parts by weight (pbw) of BMIMTf. A discrepancy was observed when 25 pbw of BMIMTf was doped into the system and was related to the reactivity of Li + and 1‐butyl‐3‐methylimidazolium cation (BMIM + ), which could be corroborated with differential scanning calorimetry scans. Fourier transform infrared spectroscopy and X‐ray diffraction revealed the role of P(VdF–HFP) as merely a mechanical support with no direct interaction with BMIMTf. Photoluminescence was also used to detect structural alterations in the local environment of PE. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2012