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High temperature behavior of poly[bis(2,2,2‐trifluoroethoxy)phosphazene]
Author(s) -
Nakamura Hitoshi,
Masuko Toru,
Kojima Morio,
Magill Joseph H.
Publication year - 1999
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/(sici)1521-3935(19991101)200:11<2519::aid-macp2519>3.0.co;2-w
Subject(s) - phosphazene , small angle x ray scattering , differential scanning calorimetry , scattering , materials science , polymer , polymer chemistry , crystallography , diffraction , melting temperature , chemistry , optics , composite material , thermodynamics , physics
Mesomorphic features of poly[bis(2,2,2‐trifluoroethoxy)phosphazene] (PBFP) with high (≈10 7 ) and low (≈10 4 ) molecular weights have been investigated by X‐ray diffraction techniques, differential scanning calorimetry optical and electron microscopy, and small‐angle X‐ray scattering. Characterization measurements were made from room temperature to ≈300°C, which is well above T m , the designated melting temperature of PBFP. The wide angle X‐ray scattering (WAXS) may be interpreted in support of some kind of “nano‐scale order” persisting above the isotropization temperature, T m , of this polymer. There is other evidence to the contrary, namely the optical isotropicity between crossed‐polars (depicts melting) and the absence of discrete small angle X‐ray scattering (SAXS) under these same conditions. An attempt is made here to establish if these features above T m are related to molecular weight.