Mani, R. ; Singh, R. P. ; Sivaram, S. ; Lacoste, J. ; Lemaire, J. (1996) Chain-scission and bleaching in heterophasic ethylene-propylene copolymers Journal of Elastomers and Plastics, 28 (2). pp. 182-190. ISSN 0095-2443
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Official URL: http://jep.sagepub.com/content/28/2/182.short
Related URL: http://dx.doi.org/10.1177/009524439602800205
Abstract
The variations in the viscosity and gloss (yellowness and whiteness index) in isotactic polypropylene, heterophasic E-P copolymers and polyethylene were measured during photo-oxidation. The samples underwent extensive reduction in intrinsic viscosity [[UNKNOWN]] upon U.V. irradiation. The kinetics of oxidative degradation have also been studied using polychromatic light at 60°C in air. These parameters appear to be a sensitive criteria to characterize the photo-oxidative transformation of polymers. The course of degradation is random and the yellowing process brought by the short wavelength U.V. light is accompanied by a photobleaching reaction which is caused by the light of longer wavelengths.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Sage Publications. |
| Keywords: | Ethylene-propylene Copolymers; U.V. Irradiation; Chain-scission; Yellowness Index; Whiteness Index |
| ID Code: | 51654 |
| Deposited On: | 29 Jul 2011 04:24 |
| Last Modified: | 29 Jul 2011 04:24 |
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