13.2.1. Conventional nano-additives
The current interest in nanocomposites began in 1991. Toyota achieved dispersion of layered silicate clays in Nylon-6, which increased highly the heat distortion temperature (HDT) and mechanical properties of Nylon-6 composites. Simultaneously in 1991, Iijima (1991) discovered carbon nanotubes (CNTs), which have attracted much attention from researchers during the past 20 years.