Study on combustion and thermal degradation behaviors of flame-retarding PA-6/PP blends added with nano-LDH and APP

Combustion and thermal degradation behaviors of polyamide-6 (PA-6)/ polypropylene (PP) blends added with nano-layered double hydroxides (LDH) and ammonium polylphosphate (APP) are studied. Results indicate that their flame-retarding ability is improved by a synergic effects between LDH and APP. LDH can promote cross-linking and char formation during the thermal degradation reaction of PA-6/PP/APP blends. Char in the blends become more homogeneous and compact and char micropores are in a closed state. The synergic flame-retarding mechanism is related to chemical and physical effects of reaction products in LDH and APP thermal degradation.