Accession Number : ADA207459

Title :   A Study of the Isothermal Crystallization Kinetics of Poly(Bis(Trifluoroethoxy)Phophazene) and Poly(Bis(Phenylphenoxy)Phosphazene).

Descriptive Note : Technical rept. 1988-1989,

Corporate Author : PITTSBURGH UNIV PA SCHOOL OF ENGINEERING

Personal Author(s) : Ciora, R J , Jr ; Magill, J H

PDF Url : ADA207459

Report Date : 01 May 1989

Pagination or Media Count : 21

Abstract : The kinetics of isothermal crystallization of two polyphosphazene polymers, poly(bis(trifluoroethoxy)phosphazene) and poly(bis(phenylphenoxy)phosphazene), have been studied utilizing a modified differential scanning calorimeter (DSC) technique and the depolarized light intensity (DLI) technique. The kinetics of transformation of both and isotropic to 2-D pseudohexagonal mesophase as well as the mesophase to 3-D orthorhombic phases have been measured and analyzed using Avrami theory. Classical nucleation theory has been utilized for estimating values of the surface free energies of the nuclei during crystallization. Keywords: Phenyl radicals. (MJM)

Descriptors :   *CRYSTALLIZATION, *PHENYL RADICALS, *PHOSPHAZENE, *POLYMERS, CALORIMETERS, ENERGY, ISOTHERMS, KINETICS, NUCLEATION, NUCLEI, SCANNING, SURFACE ENERGY, THEORY, TRANSFORMATIONS

Subject Categories : Polymer Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE