Complex char formation in flame-retarded fibre-intumescent combinations—II. Thermal analytical studies

Kandola, Baljinder K. ORCID: 0000-0002-3621-3724 and Horrocks, Richard ORCID: 0000-0003-1431-058X (1996) Complex char formation in flame-retarded fibre-intumescent combinations—II. Thermal analytical studies. Polymer Degradation and Stability, 54 (2-3). pp. 289-303. ISSN 0141-3910

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Official URL: https://www.sciencedirect.com/journal/polymer-degr...

Abstract

It is well known that flame retardant fibres, when heated, decompose differently when compared to untreated ones and this is especially so for char-promoting flame-retarding species such as Lewis-acid generators in cellulosic fibres. Certain intumescent systems when dispersed about flame retardant fibres, interact and develop a unique ‘char-bonded’ structure which has been shown to enhance flame and heat resistant properties. These interactive fibre-intumescent combinations require that both the flame retardant fibre and intumescent form chars by chemically and physically compatible mechanisms, usually by a semi-liquid intermediate phase. Examples analyzed to date are flame retarded viscose fibres (Visil, Kemira; Lenzing FR Viscose) which although comprising different flame-retarding species, generate polyacids on heating. Intumescents based on ammonium polyphosphate behave in a similar way thus enabling physicochemical interactions of both charring components to occur. Initial studies of char structure using scanning electron microscopy have already shown evidence for this kind of interaction. In this paper, the mode of thermal degradation of these systems has been studied by thermal analysis (DSC, TGA) and the nature of char determined by IR studies. The results of these investigations are used to more fully understand the mechanisms involved.

Item Type: Article
Additional Information: Paper published in ‘Special Issue’ of Polymer Degradation Stability which contains a complete account of the proceedings of the Fifth European Conference on Fire Retardant Polymers which was held in Salford in September 1995.
Divisions: University of Bolton Research Centres > Institute for Materials Research and Innovation
Depositing User: Scott Wilson
Date Deposited: 26 Nov 2013 12:53
Last Modified: 20 Sep 2018 08:54
Identification Number: 10.1016/S0141-3910(96)00054-7
URI: http://ubir.bolton.ac.uk/id/eprint/64

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