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Structure and electrical conductivity in novel polyurethane ionomers
Author(s) -
Polizos G,
Georgoussis G,
Kyritsis A,
Shilov V V,
Shevchenko V V,
Gomza Yu P,
Nesin S D,
Klimenko N S,
Wartewig S,
Pissis P
Publication year - 2000
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/1097-0126(200009)49:9<987::aid-pi492>3.0.co;2-b
Subject(s) - materials science , differential scanning calorimetry , small angle x ray scattering , crystallization , ionic conductivity , ionic bonding , polyurethane , polymer chemistry , chemical engineering , ionomer , oxide , ethylene oxide , copolymer , polymer , composite material , scattering , ion , chemistry , organic chemistry , electrolyte , physics , electrode , metallurgy , optics , thermodynamics , engineering
Novel polyurethane (PU) ionomers based on poly(teramethylene oxide) (PTMO) or poly(ethylene oxide) (PEO), with nonionic hard segments of varying length and flexible segments containing sodium ions (Na + ), have been prepared and their structure–property relationships have been investigated. The structure and the morphology were studied by means of differential scanning calorimetry (DSC), infrared (IR) spectroscopy and small‐angle X‐ray scattering (SAXS). Ionic conductivity was studied by means of broadband dielectric relaxation spectroscopy (DRS, 10 −2 –10 9 Hz). PTMO‐based ionomers are characterized by the coexistence of segment microphase separation and ionic group segregation morphologies. In the PEO‐based ionomers, crystallization is observed at low hard segment content, with a tendency for crystallization to decrease upon hard segment extension. Values of ionic conductivity are in the range 10 −7 S m −1 to 10 −4 S m −1 at 323 K for PU ionomers based on PTMO and PEO, respectively. © 2000 Society of Chemical Industry