The Thermal Breakdown of Poly(diphenoxyphosphazene)

H. R. Allcock; G. Y. Moore; W. J. Cook

doi:10.1021/ma60041a007

The Thermal Breakdown of Poly(diphenoxyphosphazene)

H. R. Allcock, G. Y. Moore, W. J. Cook

Research output: Contribution to journal › Article › peer-review

59 Scopus citations

Abstract

Poly (diphenoxyphosphazene), [NP(OC₆H₅)₂]_n was subjected to thermal degradation studies over the temperature range of 100–400°, and the reaction products were analyzed by gel permeation chromatography, solution viscosity, and mass spectrometry. A general lowering of the molecular weight with increasing temperature was observed at temperatures above 100°. An initial sharp decrease in molecular weight was ascribed to chain cleavage at weak points along the backbone, and the formation of cyclic oligomers appeared to result from a subsequent cyclization-depolymerization process. The mechanism whereby chlorobenzene is formed as a trace fragmentation species is discussed. Depolymerizations in solution at temperatures between 30 and 161° were also studied.

Original language	English (US)
Pages (from-to)	571-575
Number of pages	5
Journal	Macromolecules
Volume	7
Issue number	5
DOIs	https://doi.org/10.1021/ma60041a007
State	Published - Sep 1 1974

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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N2 - Poly (diphenoxyphosphazene), [NP(OC6H5)2]n was subjected to thermal degradation studies over the temperature range of 100–400°, and the reaction products were analyzed by gel permeation chromatography, solution viscosity, and mass spectrometry. A general lowering of the molecular weight with increasing temperature was observed at temperatures above 100°. An initial sharp decrease in molecular weight was ascribed to chain cleavage at weak points along the backbone, and the formation of cyclic oligomers appeared to result from a subsequent cyclization-depolymerization process. The mechanism whereby chlorobenzene is formed as a trace fragmentation species is discussed. Depolymerizations in solution at temperatures between 30 and 161° were also studied.

AB - Poly (diphenoxyphosphazene), [NP(OC6H5)2]n was subjected to thermal degradation studies over the temperature range of 100–400°, and the reaction products were analyzed by gel permeation chromatography, solution viscosity, and mass spectrometry. A general lowering of the molecular weight with increasing temperature was observed at temperatures above 100°. An initial sharp decrease in molecular weight was ascribed to chain cleavage at weak points along the backbone, and the formation of cyclic oligomers appeared to result from a subsequent cyclization-depolymerization process. The mechanism whereby chlorobenzene is formed as a trace fragmentation species is discussed. Depolymerizations in solution at temperatures between 30 and 161° were also studied.

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