Large stabilizing effect of titanium dioxide on photodegradation of PVC/α‐methylstyrene‐acrylonitrile copolymer/impact modifier‐matrix composites

Abstract

A large stabilizing effect was obtained via adding titanium dioxide (TiO2) into poly (vinyl chloride)/α‐methylstyrene‐acrylonitrile copolymer/impact modifier blends. A comparison between photodegradation of blends (without TiO2) and composites (with TiO2) was conducted. Results of color difference, surface morphology, and thermogravimetric analysis tests indicated the higher UV resistance of composites than blends. Composites exhibited a almost unchangeable tensile strength and a certain retention rate of elongation at break; while drastic loss in these two properties were observed for blends. Fourier transform infrared and rheological tests also revealed the stabilizing effect exerted by TiO2, and it was found that different systems exhibited different stabilizing mechanisms. POLYM. COMPOS., 35:2365–2375, 2014. © 2014 Society of Plastics Engineers

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