Environmental degradation of highly loaded polypropylene

Benavides, R, Ponce-Ibarra, V H, Reyes-Vielma, B and Billingham, N C (2003) Environmental degradation of highly loaded polypropylene. Journal of Vinyl & Additive Technology, 9 (1). pp. 32-40.

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Six formulations of polypropylene (PP) containing combinations of calcium carbonate
(CaCO,), stearic acid, and a light stabilizer were prepared and placed in the
environment for their degradation. Samples were taken at proper time intervals for
following the consequences of the outdoor conditions. Impact resistance and elongation
at rupture were evaluated as mechanical properties. On the other hand, size
exclusion chromatography, chemiluminescence, and infrared spectroscopy (FTIR)
were used to follow chemical changes. Polypropylene by itself showed a slow but
stable aging, while PP + CaCO, had improved initial mechanical properties but was
more sensitive to degradation. The treatment of CaCO, with stearic acid before its
addition to PP resulted in an improved material but with an induction time to degradation
greatly reduced to 2 weeks of environmental exposure. The addition of the
W stabilizer reduced the negative effect of the stearic acid to some extent but did
not compensate for it completely.

Item Type: Article
Schools and Departments: School of Life Sciences > Chemistry
Depositing User: Norman Billingham
Date Deposited: 06 Feb 2012 19:20
Last Modified: 21 Mar 2012 15:23
URI: http://srodev.sussex.ac.uk/id/eprint/20151
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