Enhancing polymer flame retardancy by reaction with phosphorylated polyols. Part 2 Cellulose treated with a phosphonium salt urea condensate (Proban CC®) flame retardant

Horrocks, Richard ORCID: 0000-0003-1431-058X and Zhang, Sheng (2002) Enhancing polymer flame retardancy by reaction with phosphorylated polyols. Part 2 Cellulose treated with a phosphonium salt urea condensate (Proban CC®) flame retardant. Fire and Materials, 26 (4-5). pp. 173-182. ISSN 0308-0501

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Abstract

Phosphorylation of cellulose flame retarded with an ammonia-cured, polycondensed tetrakis(hydroxymethyl) phosphonium-urea derivative (as Proban CC®, Rhodia) with a polyol diphosphoryl chloride or phosphorochloridate like spirocyclic pentaerythritol di(phosphoryl chloride) or diphosphorochloridate, SPDPC can yield phosphorus levels in excess of 10%(w/w). Such high levels suggest up to 82% yields of reaction if phosphorylation of the free secondary amine groups present in the cross-linked flame retardant is the assumed site. The presence of substituted pentaerythritol phosphate moieties significantly increases char formation above 400oC and scanning electron microscopy indicates that the char has an intumescent structure. The char-forming characteristic is not influenced by subjecting the phosphorylated flame retardant cellulose to boiling in a 1%detergent solution in water thereby suggesting that the product is durable. The potential of this reaction to create a durable, intumescent flame retardant for cellulose is discussed.

Item Type: Article
Uncontrolled Keywords: Cellulose, cotton, phosphorylation, spirocyclicpentaerythritol diphosphoryl chloride, Proban, tetrakis(hydroxyl methyl) phosphonium condensate, char, thermogravimetric analysis
Divisions: University of Bolton Research Centres > Institute for Materials Research and Innovation
Depositing User: Tracey Gill
Date Deposited: 28 Jan 2019 19:54
Last Modified: 28 Jan 2019 19:54
Identification Number: 10.1002/fam.794
URI: http://ubir.bolton.ac.uk/id/eprint/2121

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