Alkanethiolates of transition metals undergo thermolysis reactions at moderately low temperatures (120-200 uC), producing metal atoms or metal sulfide molecules and an organic by-product (disulfide or a thioether). Metal n-alkanethiolates (i.e., Me x (SC n H 2n11 ) y , with n ~12, 16 and 18) dissolve in polymers and the resulting solid solutions can be annealed to give polymer-embedded metal or metal sulfide clusters (i.e., metal/polymer nanocomposites). As an example, the preparation of silver, gold, cobalt and palladium clusters dispersed in polystyrene has been described, but the method is very general and a variety of metal/polymer and metal sulfide/polymer combinations can be obtained.

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This article aims to prepare by injection molding recycled polymeric composites based on PA66 reinforced with short carbon fibers after artificial aging for applications in the automotive field. The aging cycles involves the combined action of UV radiation, moisture, and temperature in order to simulate the common outdoor conditions. The 100% recycled composites are obtained by the regranulation of the aged specimens followed by the remelting and re-injection molding. The study is focused on the comparison between the mechanical behavior and the microstructure of the composites before and after mechanical recycling. The results of mechanical, thermal, and morphological investigations reveal that the recycling process had no significant effect on the final properties and microstructure of the recycled composites. Therefore the recycled PA66CF30 composites could be successfully used for structural or semi-structural automotive applications guaranteeing good final performances and advantages from the environmental point of view.

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