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Comparing Ammonium and Phosphonium Polymerized Ionic Liquids: Thermal Analysis, Conductivity, and Morphology
Author(s) -
Hemp Sean T.,
Zhang Mingqiang,
Allen Michael H.,
Cheng Shijing,
Moore Robert B.,
Long Timothy E.
Publication year - 2013
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201300322
Subject(s) - phosphonium , polymer chemistry , morphology (biology) , polymerization , ammonium , ionic conductivity , ionic liquid , chemical engineering , materials science , ionic bonding , chemistry , polymer , organic chemistry , ion , catalysis , genetics , electrode , engineering , electrolyte , biology
Conventional free radical polymerization and anion metathesis of ammonium and phosphonium styrenics successfully generates high‐molecular‐weight polymerized ionic liquids (PILs). Phosphonium polyelectrolytes containing Cl ‐ counterions display significantly higher thermal stabilities (>370 °C) compared with ammonium analogs (<220 °C). Anion exchange to BF 4 – , TfO – , and Tf 2 N – improves the thermal stability of all the PILs and depresses their T g . Impedance‐spectroscopy‐probed ionic conductivities of PILs containing Tf 2 N – , and phosphonium PILs exhibit higher values than ammonium analogs. Phosphonium PILs displayed many advantages over ammonium PILs for emerging applications that demand higher thermal stabilities and ionic conductivities.