Flame-resistance and thermal stability of 1 4-polydienes modified by dialkyl (or aryl) phosphates

Derouet D., . and Morvan F., . and Brosse J.C., . Flame-resistance and thermal stability of 1 4-polydienes modified by dialkyl (or aryl) phosphates. pp. 9-25. ISSN 0127-7065

The chemical modification of 1 4-polydienes by dialkyl (or aryl) phosphates was considered in order to improve their flame-resistance. Chemical introduction of phosphorus onto polydienes was carried out by a two-step process : partial epoxidation of unsaturated units and introduction of the dialkyl (or aryl) phosphate using the reactivity of the P-OH acidic bond towards oxirane rings of epoxidised 1 4-polydienes (synthetic polybutadiene polyisoprene and liquid natural rubber). Incorporation of phosphorus ( around 1.1 - 1.2 weight percent) in crosslinked polydienes is generally sufficient to produce air fire-resistant materials. The best limiting oxygen indices (LOI) are obtained with diphenyl phosphate. Degradation kinetics of modified polydiene networks at moderate temperatures (from 200 degree Celcius to 400 degree Celcius) are more and less similar to those of unmodified specimens but the weight losses are weaker after 400 degree Celcius. The residual masses after 600 degree Celcius are relatively important compared to the unmodified specimens which are entirely decomposed at this temperature.

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Abstract

The chemical modification of 1 4-polydienes by dialkyl (or aryl) phosphates was considered in order to improve their flame-resistance. Chemical introduction of phosphorus onto polydienes was carried out by a two-step process : partial epoxidation of unsaturated units and introduction of the dialkyl (or aryl) phosphate using the reactivity of the P-OH acidic bond towards oxirane rings of epoxidised 1 4-polydienes (synthetic polybutadiene polyisoprene and liquid natural rubber). Incorporation of phosphorus ( around 1.1 - 1.2 weight percent) in crosslinked polydienes is generally sufficient to produce air fire-resistant materials. The best limiting oxygen indices (LOI) are obtained with diphenyl phosphate. Degradation kinetics of modified polydiene networks at moderate temperatures (from 200 degree Celcius to 400 degree Celcius) are more and less similar to those of unmodified specimens but the weight losses are weaker after 400 degree Celcius. The residual masses after 600 degree Celcius are relatively important compared to the unmodified specimens which are entirely decomposed at this temperature.

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Item Type:	Article
Additional Information:	Summary (En)
AGROVOC Term:	ELASTOMEROS
AGROVOC Term:	POLIMEROS
AGROVOC Term:	RESISTENCIA A LA TEMPERATURA
AGROVOC Term:	QUEMA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:51
URI:	http://webagris.upm.edu.my/id/eprint/17234

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