Influence of the terminal groups on the thermodegradation of aromatic polyamides

The semi-empirical MINDO/3 method is used to make a quantum-chemical evaluation of the influence of the terminal groups on the strength of the bonds in the amide group and the thermodynamic possibility of the reactions proceeding on heterolytic breakdown of the aromatic polyamides is examined. The c...

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Bibliographic Details
Published in:Polymer science USSR 1984, Vol.26 (11), p.2547-2554
Main Authors: Bolduzev, A.I, Kurganova, M.N, Terekhina, L.A
Format: Article
Language:English
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Summary:The semi-empirical MINDO/3 method is used to make a quantum-chemical evaluation of the influence of the terminal groups on the strength of the bonds in the amide group and the thermodynamic possibility of the reactions proceeding on heterolytic breakdown of the aromatic polyamides is examined. The calculated data are compared with the experiment on the thermal degradation of poly- m-phenylene isophthalamide and amides modelling the elementary unit of this polymer. It is shown that the amide with terminal amine groups is thermally more stable than the amide with terminal caboxyl groups; the terminal groups take part in reactions leading to the formation of water and insoluble products. In the temperature intervals studied the main role is played by heterolytic breakdown of the amide group.
ISSN:0032-3950
1878-268X
DOI:10.1016/0032-3950(84)90209-0