摘要:

A polybenzimidazolone prepared by the condensation of 1,45,8-naphthalene tetracarboxylic acid and 3,3′-diaminobenzidine and several model compounds were thermally degraded (300-500°C) under inert and oxidative conditions. In every case only small fragments, i.e., carbon oxides, cyanogen (trace), and water, were detected by spectroscopic and chromatographic analysis of all phases of the pyrolysis products. The significance of these results is discussed in light of the mechanism by which this aromatic heterocyclic system undergoes oxidative degradation.

ISSN:0022-233X    

DOI:10.1080/00222337008063157

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

The thermal degradation of some high molecular weight polyphosphazenes is reported. The investigation was carried out on a thermobalance in vacuum. The products of degradation were assessed. The molecular weight change of one of the polymers [(PhO)2P˭N]n, on being heated in vacuum, was followed by viscosity measurements and the results are discussed with reference to the existence of a possible chain-ring degradation equilibrium.

ISSN:0022-233X    

DOI:10.1080/00222337008063158

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0022-233X    

DOI:10.1080/00222337008063146

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor