The flammability of hybrid viscose blends

Garvey, S.J., Anand, Subhash, Rowe, Trevor, Horrocks, Richard ORCID: 0000-0003-1431-058X and Walker, David G. (1996) The flammability of hybrid viscose blends. Polymer Degradation and Stability, 54 (2-3). pp. 413-416. ISSN 0141-3910

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Visil (manufactured by Kemira Fibres Oy, Finland) is a hybrid of organic-inorganic components to give a cellulosic fibre containing polysilicic acid produced by a modified viscose process. Viscose on its own will burn, but non-flammable polysilicic acid which is present in Visil, when heated causes the cellulose to char and the silica formed to provide a flame and heat barrier. Thus the fibre is only partly combustible and reduced volatiles from the cellulose emit only minor amounts of smoke along with some carbon monoxide and carbon dioxide. When blended with other fibres which have low flammabilities themselves, non-additive levels of flame retardance may be observed compared with those expected from averaging of individual component properties. Initial results of a larger research programme show that blends of Visil and modacrylic in yarn form show either higher or lower-than-expected Limiting Oxygen Index (LOI) values depending upon the yarn structure. These effects are corroborated by char length studies following vertical strip testing which show that either synergistic or more additive effects are possible depending on yarn physical structure.

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: Tracey Gill
Date Deposited: 20 Sep 2018 08:58
Last Modified: 20 Sep 2018 08:58
Identification Number: 10.1016/S0141-3910(96)00072-9

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