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Observation of different photo-degradation behaviour in two similar polypropylenes

Lookup NU author(s): Emeritus Professor Jim White

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Abstract

The photodegradation properties of injection moulded bars 3 mm thick made from two nominally similar toughened polypropylene compounds (PP and MPP) have been found to differ remarkably in some aspects. In both of them the plot of the mass average molecular mass (Mw) versus distance from the exposed surface displayed a steep sigmoidal shape with very low values near the surface and values close to the undegraded value near the bar centre. With PP the steepest part of the Mw versus depth plot remained at almost the same position irrespective of exposure time for tests carried out for periods up to 64 weeks whereas with MPP the steepest part of the plot shifted progressively in from the exposed surface as exposure increased. The tensile strength fell rapidly with exposure time in both PP and MPP but with PP partial recovery was observed whereas with MPP the fall in strength appeared to be monotonic with exposure time. © 2001 Kluwer Academic Publishers.

Publication metadata

Author(s): White JR; Turton TJ

Publication type: Article

Publication status: Published

Journal: Journal of Materials Science

Year: 2001

Volume: 36

Issue: 19

Pages: 4617-4624

ISSN (print): 0022-2461

ISSN (electronic): 1573-4803

Publisher: Springer

URL: http://dx.doi.org/10.1023/A:1017937929149

DOI: 10.1023/A:1017937929149

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