Flame-resistance and thermal stability of 1,4-polydienes modified by dialkyl (or aryl) phosphates
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...
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| Main Authors: | , , |
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| Format: | Journal Contribution |
| Language: | English |
| Published: |
2018
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| Subjects: | |
| Online Access: | http://agris.upm.edu.my:8080/dspace/handle/0/14980 |
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| Summary: | 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°C to 400”C) are more and less similar to those of unmodified specimens but the weight losses are weaker after 400°C. The residual masses after 600°C are relatively important compared to the unmodified specimens which are entirely decomposed at this temperature. |
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