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Thermal analysis of poly(bisphenoxyphosphazene); single crystals and melt crystallized samples
Author(s) -
Kozmiski S. J.,
Harrison Ian R.
Publication year - 1982
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1982.070270534
Subject(s) - crystallization , materials science , thermal , polymer , atmospheric temperature range , morphology (biology) , crystal (programming language) , thermal analysis , chemical engineering , polymer chemistry , composite material , thermodynamics , genetics , biology , physics , computer science , engineering , programming language
High‐molecular‐weight polyphosphazenes are of considerable interest because of their potential use as relatively high temperature materials that also possess low glass temperature. A number of authors have examined the thermal properties of a wide range of polyphosphazenes. These studies, however, have usually been limited to compression‐molded samples or to samples where the morphology or thermal history are poorly understood or highly complex. This article reports the thermal behavior of a single polymer, poly(bisphenoxyphosphazene) starting with the simplest morphological entity—the single crystal. The result of crystallization from the mesomorphic state [above T (1)] and from the melt were also examined, together with the influence of thermal cycling and heating rate. The effects of a variety of parameters on T (1) are reported. This work clearly demonstrates the importance of morphology–crystallization conditions in determining T (1) and suggests the presence of two crystal forms for this polymer.