NANOCOMPOSITES - A NEW FLAME RETARDANT SYSTEM FOR POLYMERS

摘要

Nanocomposites are a new class of polymer systems. Modified layered silicates as fillers are dispersed at a nm-level within a polymer matrix. For nanocomposites new extraordinary properties are observed. The thermal stability and the flame retardancy of EVA based nanocomposites are improved. The flame retardancy mechanism of layered silicate nanocomposites is based on the improved char formation and its structure; the char insulates the polymer from heat and acts as a barrier, reducing the escape of volatile gases from the EVA combustion. The Cone calorimeter is a useful tool to investigate the properties of the flame retardancy. Improvements of the flame retardancy by combinations of modified layered silicates and traditional flame retardants on basis metal hydroxides are reported for cable applications.