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Photomechanical oxidation of anisotropic polyethylene

Lookup NU author(s): Emeritus Professor Jim White, Dr Terry Egerton, Professor Paul ChristensenORCiD, Chunyu JIN


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Blown polyethylene film was exposed to ultraviolet (UV) irradiation while under stress applied (i) parallel and (ii) perpendicular to the machine direction. Oxidation was followed using the FTIR carbonyl index and was found to accelerate under tensile stress. Some samples broke during UV-tension exposure and did so in a shorter time when stress was applied in the machine direction than when it was applied in the transverse direction. Samples with different TiO2 pigments gave different rates of carbonyl development; some showed greater acceleration when stress was applied parallel to the machine direction, others when it was applied transversely. The carbonyl index was approximately the same at break for all longitudinally stressed samples and a higher carbonyl index was found at the onset of cracking for transversely strained samples.

Publication metadata

Author(s): White JR, Egerton TA, Christensen PA, Jin C

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: Annual Technical Conference Proceedings

Year of Conference: 2004

Pages: 2102-2106

Publisher: Society of Plastics Engineers, SPE