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Weathering of polypropylene composites containing weldlines

Lookup NU author(s): Emeritus Professor Jim White


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This work deals with the weathering behaviour of polypropylene composites containing fillers with various aspect ratios (glass fibre. talc. and calcium carbonate). Single and double end gated injection moulded bars were exposed outdoors In Campina Grande (Brazil) for periods up to 45 weeks and then characterised using Infrared spectroscopy. tensile testing. and surface fractography. The unfilled polymer displayed the highest level of mechanical deterioration, followed by polypropylene containing glass fibre, whereas compounds with talc and calcium carbonate were the most resistant to photodegradation. These results are partially a consequence of the screening effect caused by talc and calcium carbonate at the exposed surface. The results indicated that weldlines make the parts weaker. although the strength loss caused by weathering of double end gated samples was similar to that observed with moulding produced by single gated injection. It was also observed that the adhesion between glass fibre and the polymer matrix was much reduced after weathering, probably as a result of diffusion of water to the interface. (C) 2001 IoM Communications Ltd.

Publication metadata

Author(s): White JR; Rabello MS; Tocchetto RS; Barros LA; D'Almeida JRM

Publication type: Article

Publication status: Published

Journal: Plastics, Rubber and Composites

Year: 2001

Volume: 30

Issue: 3

Pages: 132-140

Print publication date: 01/01/2001

ISSN (print): 1465-8011

ISSN (electronic): 1743-2898

Publisher: Maney Publishing