NANOCLAY FILLED MULTILAYERED SYSTEMS FOR GAS BARRIER AND FIRE RETARDANT PROPERTIES

摘要

Nanoclay filled multilayer structures with enhanced gas barrier and fire retardency propertiesrnwere prepared. Multilayered materials were processed with alternating layers of pure low-densityrnpolyethylene (LDPE) and nanoparticulate filled linear low-density polyethylene (LLDPE) by arnforced assembly process. The nanoparticle filled LLDPE was processed by melt-mixingrnmodified mica with maleic anhydride grafted LLDPE (LLDPE-g-MA) using a twin screwrnextruder. Multilayered materials were annealed above the melting temperature in order torninvestigate interlayer interdiffusion. Because of the structural differences in the twornpolyethylenes, the linear LLDPE interdiffuses much more rapidly than the long branched LDPE.rnInterlayer interdiffusion of the polymers with vastly different diffusion coefficients resulted in arnshrinkage of the LLDPE layers and a concentration of the nanoparticles. Gas barrier properties ofrnthe nanocomposites and multilayered materials at various stages of interdiffusion were analyzed.rnIt was observed that the oxygen barrier properties of the annealed multilayer materials improvedrnas compared to the original multilayer materials. Additionally, the fire properties of thernmultilayer materials were improved compared to the nanocomposites.