High temperature behavior of poly[bis(2,2,2-trifluoroethoxy)-phosphazene]

Citation
H. Nakamura et al., High temperature behavior of poly[bis(2,2,2-trifluoroethoxy)-phosphazene], MACRO CH P, 200(11), 1999, pp. 2519-2524
Citations number
35
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
MACROMOLECULAR CHEMISTRY AND PHYSICS
ISSN journal
1022-1352 → ACNP
Volume
200
Issue
11
Year of publication
1999
Pages
2519 - 2524
Database
ISI
SICI code
1022-1352(199911)200:11<2519:HTBOP>2.0.ZU;2-R
Abstract
Mesomorphic features of poly[bis(2,2,2-trifluoroethoxy)phosphazene] (PBFP) with high (approximate to 10(7)) and low (approximate to 10(4)) molecular w eights have been investigated by X-ray diffraction techniques, differential scanning calorimetry optical and electron microscopy, and small-angle X-ra y scattering. Characterization measurements were made from room temperature to approximate to 300 degrees C, which is well above T-m, the designated m elting temperature of PBFP. The wide angle X-ray scattering (WAXS) may be i nterpreted in support of some kind of "nano-scale order" persisting above t he isotropization temperature, T-m, of this polymer. There is other evidenc e 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 hen to establish if t hese features above T-m are related to molecular weight.