Changes in carbonyl index and average molecular weight on embrittlement of enhanced-photodegradable polyethylenes |
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Authors: | A L Andrady J E Pegram Y Tropsha |
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Institution: | (1) Research Triangle Institute, P.O. Box 12194, 27709 Research Triangle Park, North Carolina;(2) Becton, Dickinson and Company Research Center, 27709 Research Triangle Park, North Carolina |
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Abstract: | Weathering behavior of two types of enhanced-photodegradable polyethylenes was studied using FTIR spectroscopy, tensile property changes, and gel-permeation chromatography to monitor structural changes accompanying photodegradation. Changes in elongation at break and carbonyl index during degradation showed a strong correlation with the average molecular weight of the polymers. At the point of embrittlement, the highest extent of degradation measured using tensile properties, the number-average molecular weights for both polymers were in the 104 g/mol range. Facile biodegradation is not expected of polyethylenes of this degree of polymerization. |
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Keywords: | Polyethylenes weathering Fourier transform infrared spectroscopy gel-permeation chromatography |
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