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In situ nylon 6/graphite composites. Physico-mechanical properties

Nylon 6/graphite composites were obtained through reactive rotational moulding via in situ anionic ring–opening polymerization of є–caprolactam monomer in the presence of various amounts of graphite microparticles. The content of graphite in the reaction mixture feed was varied from 0.0 to 15.0 wt %. The initial mould temperature (initial polymerization temperature) was 160 ± 2 o C. The degree of polymerization and the water absorption of nylon 6 matrix prepared in the presence of graphite are decreased as the amount of filler increases. The DSC results show that graphite content has a small influence on the melting temperatures of polyamide 6 in these composites. From melting enthalpy results it seems that graphite particles act as nucleating agents, giving rise to increased crystallinities of the polyamide. The increase of graphite content causes an increase of the degree of crystallinity of the nylon 6/graphite composites. The thermal stability of the nylon 6 graphite powder composites is better than that for of the pure nylon 6. Notched Izod impact strength decreases gradually with the increasing of graphite concentration, while flexural strength and flexural modulus improved.