Chain-scission and yellowing in high impact polystyrene

Singh, R. P. ; Raj, R. A. ; Vishwa Prasad, A. ; Sivaram, S. ; Lacoste, J. ; Lemaire, J. (1995) Chain-scission and yellowing in high impact polystyrene Polymer International, 36 (4). pp. 309-313. ISSN 0959-8103

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Different grades of impact-modified polystyrene were studied by viscometry, tensile impact test and colour change upon exposure to polychromatic irradiation at 55°C in air. The samples underwent extensive reduction in intrinsic viscosity [η] and tensile impact strength, and yellowed upon polychromatic irradiation (λ ≥ 290 nm). Chain-scission during photo-oxidative degradation was also studied under conditions where evolution of volatiles was negligible. Tristimulus values were calculated for unirradiated and irradiated samples. The rate of oxidative degradation was maximum in the sample possessing higher unsaturation content.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons.
Keywords:High Impact Polystyrene; Polychromatic Irradiation; Viscosity; Tensile Impact; Yellowing
ID Code:48532
Deposited On:14 Jul 2011 14:16
Last Modified:14 Jul 2011 14:16

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