The flammability of polyacrylonitrile and its copolymers

Hall, M. E., Horrocks, Richard ORCID: 0000-0003-1431-058X and Zhang, Jun (1994) The flammability of polyacrylonitrile and its copolymers. Polymer Degradation and Stability, 44 (3). pp. 379-386. ISSN 0141-3910

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Abstract

The burning behaviour and the influence of flame-retardant species on the flammability of fibre-forming homopolymer and copolymers of acrylonitrile are reported. A pressed powdered polymer sheet technique has been developed which allows a range of polymer compositions in the presence and absence of flame regardants to be assessed for limiting oxygen index, burning rate and char residue determinations. The method has been used to provide a rapid, reproducible and convenient means of screening possible flame-retardant systems. It has been shown that the mechanism of thermal degradation of acrylic polymers is dependent on the rate of heating. At low heating rates cyclisation is the main reaction pathway, whereas at high heating rates commensurate with those encountered in fires volatile-forming chain scission predominates. Furthermore, the effectiveness of a particular flame retardant is directly proportional to its char-forming tendency. The most effective of the flame retardants studied was ammonium polyphosphate, and a mechanism by which this operates is suggested.

Item Type: Article
Subjects: T Technology > T Technology (General)
Divisions: University of Bolton Research Centres > Institute for Materials Research and Innovation
Depositing User: Tracey Gill
Date Deposited: 29 Aug 2018 09:46
Last Modified: 29 Aug 2018 09:46
Identification Number: 10.1016/0141-3910(94)90097-3
URI: http://ubir.bolton.ac.uk/id/eprint/1890

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