Char formation in polyamides (nylons 6 and 6.6) and wool keratin phosphorylated by polyol phosphoryl chlorides

Horrocks, Richard ORCID: 0000-0003-1431-058X and Zhang, Sheng (2004) Char formation in polyamides (nylons 6 and 6.6) and wool keratin phosphorylated by polyol phosphoryl chlorides. Textile Research Journal, 74 (5). pp. 433-441. ISSN 0040-5175

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Polyamides (nylon 6 and 6.6) phosphorylated by spirocyclic pentaerythritol phosphoryl chloride (SPDPC), cyclic 1,3-propanediol phosphoryl chloride (CPPC) and cyclic 2,2-diethyl-1,3-propanediol phosphoryl chloride (CDPPC) can give phosphorus levels up to 0.7%(w/w). Calculation suggests that only primary amine groups at the end of the molecular chain are the possible phosphorylation sites. The presence of substituted 1,3-propanediol phosphonate moieties significantly increases polyamide char formation above 500oC and scanning electron microscopy indicates that the residual char has an intumescent structure. SPDPC-phosphorylated wool keratin yields higher phosphorus levels up to 2.06%. For nylons 6 and 6.6, the presence of a methylolated trazine (as the commercial agent Lyofix MLF new, Ciba) in the pad-cured treatment can increase the phosphorus level further to give significantly enhanced char formation. SEM images suggest that the reacted substrates yield char volume expansions in wool of up to 336% compared to the control sample chars.

Item Type: Article
Uncontrolled Keywords: Polyamide, nylon 6, nylon 6.6, wool, phosphorylation, pentaerythritol phosphoryl chloride, cyclic 1,3-propanediol phosphoryl chloride, char, intumescent, nanoclay
Subjects: T Technology > TP Chemical technology
Divisions: University of Bolton Research Centres > Institute for Materials Research and Innovation
Depositing User: Tracey Gill
Date Deposited: 30 Jan 2019 14:56
Last Modified: 30 Jan 2019 14:56
Identification Number: 10.1177/004051750407400510

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