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Synthesis and characterization of a novel difluoromethylene phosphonic acid functionalized polymer
Author(s) -
Alter Christian,
Hoge Berthold
Publication year - 2018
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.46765
Subject(s) - differential scanning calorimetry , polymer chemistry , polymer , potentiometric titration , monomer , nafion , dielectric spectroscopy , radical polymerization , materials science , gel permeation chromatography , anhydrous , polymerization , conductometry , styrene , conductivity , chemistry , copolymer , electrochemistry , organic chemistry , inorganic chemistry , ion , physics , electrode , thermodynamics
A novel polymer featuring difluoromethylene phosphonic acid functions was prepared by free radical polymerization of a styrene monomer that is decorated by phosphonic ester groups. The obtained polymer was analyzed by gel permeation chromatography, differential scanning calorimetry, and spectroscopy (NMR, infrared). Treatment of the polymeric phosphonic ester with Me 3 SiBr led to an exchange of the ethyl groups by trimethylsilyl units in the P‐containing part of the material. Desilylation to the free phosphonic acid functions was effected by water. The ion exchange capacity was determined to be 7.3 mmol/g by titration with 0.1 M NaOH. The proton conductivity in the anhydrous state was studied by electrochemical impedance spectroscopy. The conductivity of 1.76 × 10 −5 S cm −1 at 120 °C is well comparable with that of Nafion (7.66 × 10 −5 S cm −1 at 120 °C), and renders this polymeric phosphonic acid as a promising candidate for proton conduction applications. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46765.