Red phosphorus contained in non-irradiated polyamide-6 at concentrations up to 12.5 does not significantly improve the fire resistance of the polymer. It weakens the thermal stability of the polymer as reflected by a decrease in the onset temperature for mass loss from 407 deg. C, 363 deg. C, but causes char formation as indicated by m~res=13 wt/100. The non-volatile residue at 600 deg. C. Irradiation of polyamide-6, loaded with red phosphorus, with 60~Co-γ-rays generates intermolecular cross-links resulting in an improved fire resistance.
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