POLYLACTIDE-LAYERED DOUBLE HYDROXIDE FILM WITH GOOD FLAME RETARDANT PROPERTY AND TRANSPARENCY

摘要

Polylactide (PLA)/layered double hydroxide (LDH) films with good flame retardant property and transparency were synthesized by solution exfoliation and film casting method.The organic-inorganic interface between PLA and NiAl-LDH was modified by 2-carboxylethyl-phenyl-phosphinic acid (CEPPA) to solve the dispersion problem of NiAl-LDH nanolayers and enhanced the flame retardancy of PLA composites.The results showed the NiAl-LDH/CEPPA (LC) nanolayers had exfoliated structures and were homogenously dispersed in PLA matrixes.All the PLA/LDH films had good transparency even LC content was up to 10 wt％.The PLA/LDH films absorbed the ultraviolet light, which alleviates the embrittlement of PLA films in the using procedure.With LC contents increasing, the flame retardant effect was observed,which was characterized by microscale combustion calorimeter.The total heat release value of the sample with 10 wt％ LC decreased to 9.7 kJ/g from 12.0 kJ/g of virgin PLA.