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Dielectric properties of poly[bis(trifluoroethoxy)phosphazene] and poly[bis( m ‐methylphenoxy)phosphazene]
Author(s) -
Moriya Keiichi,
Nishibe Yasushi,
Yano Shinichi
Publication year - 1994
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.1994.021950228
Subject(s) - phosphazene , dielectric , relaxation (psychology) , glass transition , polymer chemistry , polymer , materials science , natural rubber , activation energy , chemistry , composite material , psychology , social psychology , optoelectronics
Dielectric properties of poly[bis(trifluoroethoxy)phosphazene] (PFEP) and poly[bis( m ‐methylphenoxy)phosphazene] (PmMPP) were studied in a temperature range from −195 to 120°C and at several frequencies between 0,1 and 100 kHz. In PFEP, two relaxations, an α relaxation above the glass transition temperature ( T g ) and a β relaxation below T g , which are related to a glass‐rubber transition and a local molecular motion of short segments, respectively, were observed. However, PmMPP shows no β relaxation. From the above dielectric results, it was concluded that side groups play an important role in molecular motion of the polyphosphazenes. In PmMPP a γ′ relaxation was found below T g by immersing the polymers into water. The γ′ relaxation is related to the molecular motin of absorbed water.