Flame-retardant properties of phenol–formaldehyde-type resins and triphenyl phosphate in styrene–acrylonitrile copolymers
✍ Scribed by L. Costa; L. Rossi Di Montelera; G. Camino; E. D. Weil; E. M. Pearce
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 531 KB
- Volume
- 68
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
The thermal and flame-retardant properties of phenol-formaldehyde-type resins (crosslinked and noncrosslinked) in mixtures with triphenyl phosphate and styrene-acrylonitrile resins were evaluated. The mixtures show a synergistic effect between triphenyl phosphate and novolacs. Those containing phenol-formaldehyde novolac resins are found to be most flame retardant. There does not seem to be a relationship between the oxygen index (OI) and UL 94 tests. Scanning electron microscopy analysis show a surface structure with cavities and stratification, very similar to that of intumescent additives. Evidence was found indicating that this flame-retardant system works in both the gas and condensed phase.