Recycling of automotive lighting — effect of UV cured coating contaminants
on polycarbonate toughness (in English)
Polimery 2011, No 11/12, 849
This work presents studies on the impact of the coating on reprocessed polycarbonate (PC) in order to evaluate changes in the fracture behavior and toughness of polycarbonate. The comparison of instrumented and non-instrumented impact testing methods is given. The fracture mechanics parameters such as dynamic strain energy release rate (GId), and fracture toughness (KId) where determined. The coating creates non-homogeneously dispersed particles, which act as stress concentrators facilitating multiple crazing and causing embrittlement of the material. The fracture toughness was diminished only slightly and was accompanied with the rise of dynamic yield stress (sd) and dynamic flexural modulus (Ed). The heat deflection temperature (HDT), melt volume flow rate (MVR) and density were affected only marginally in comparison to recycled polycarbonate without coating contaminants.
Key words: polycarbonate, reprocessing, silicon-modified polyurethane acrylate coating, fracture toughness, dynamic strain energy release rate