Lookup NU author(s): Jonathan Heslop,
Emeritus Professor Jim White
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The photodegradation of thermoplastic elastomers designed for outdoor applications was studied with laboratory ultraviolet (UV) exposure in the unstrained state and under tensile strain (25 and 50%). Strained exposure caused a reduction of the strain to failure in subsequent tensile tests. For some combinations of material and exposure conditions, some recovery of extensibility occurred between 2 and 4 weeks. Microscopic examination revealed that this was probably due to embrittlement of the surface region that was sufficiently severe that surface cracks did not prop agate into the interior and that the observed recovery did not correspond to repair or improvement of the material. Shielding the sample surface from UV irradiation reduced the formation of surface cracking very significantly, and it was deduced that the principal cause of degradation was photooxidation rather than ozone attack. © 2005 Wiley Periodicals, Inc.
Author(s): Bhowmick AK, Ray S, Shanmugharaj AM, Heslop J, Koppen N, White JR
Publication type: Article
Publication status: Published
Journal: Journal of Applied Polymer Science
ISSN (print): 0021-8995
ISSN (electronic): 1097-4628
Publisher: John Wiley & Sons, Inc.
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