“…[9,15] In fact, highly improved properties have been observed just by adding small amounts (<5%) of clay to the polymer matrix, without affecting the optical homogeneity of the material. [8,16,17] Polyethylene (PE) and polystyrene (PS) belong to a class of commercial polymers of wide use. [18] PE is a ductile polymer, with a low modulus and a high elongation at break, while PS is brittle, with a high modulus and a very low elongation at break.…”