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Natural weathering of polypropylene films. II. Ultimate properties and exposure time

โœ Scribed by T. C. Uzomah; G. C. Unuoha

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
170 KB
Volume
69
Category
Article
ISSN
0021-8995

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โœฆ Synopsis

Changes in the ultimate properties brought about by outdoor weathering during the rainy season of polypropylene (PP) films were studied. The results obtained showed that the draw ratio l d , tensile stress s b , breaking ratio l b , breaking factor (BF), work draw U d , and work for rupture U r all increased with increase in outdoor exposure time, attaining a maximum at about 240-h exposure time, before decreasing with further increases in exposure time. On the other hand, the draw ratio d s remained practically constant up to about 100-h exposure time. The changes in the former set of properties were corroborated by the changes in the apparent crystallinity of the PP samples. In addition, it was shown that a 504-h exposure time was not enough to reduce the properties to damaging levels.

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