Dielectric properties of poly[bis(trifluoroethoxy)phosphazene] and poly[bis(m-methylphenoxy)phosphazene]

✍ Scribed by Keiichi Moriya; Yasushi Nishibe; Shinichi Yano

• Publisher: John Wiley and Sons
• Year: 1994
• Tongue: English
• Weight: 342 KB
• Volume: 195
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1994.021950228

✦ Synopsis

Abstract

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.