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IR spectroscopy study of polypropylene natural aging
Author(s) -
Rjeb A.,
Tajounte L.,
El Idrissi M. Chafik,
Letarte S.,
Adnot A.,
Roy D.,
Claire Y.,
Périchaud A.,
Kaloustian J.
Publication year - 2000
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/1097-4628(20000822)77:8<1742::aid-app11>3.0.co;2-t
Subject(s) - polypropylene , tacticity , oxygen , polymer chemistry , methylene , infrared spectroscopy , spectroscopy , chemistry , deconvolution , carbonyl group , carbon fibers , materials science , photochemistry , analytical chemistry (journal) , chemical engineering , organic chemistry , polymerization , composite material , medicinal chemistry , polymer , composite number , physics , quantum mechanics , algorithm , computer science , engineering
Structural modifications of a commercial polypropylene (PP) sample are studied by IR spectroscopy. Aging this sample under an ambient atmosphere with or without the presence of ambient light shows the oxidation process to be the most predominant. Spectral analysis reveals that the commercial sample is isotactic and also indicates that, for the new sample, oxygen establishes single bonds with carbon. However, through the aging process, spectral changes essentially occur in the regions of ∼3400, ∼1712, and 1170 cm −1 which correspond to hydroxyl and/or hydroperoxide groups, a carbonyl group, and CO, respectively. The deconvolution of the bands corresponding to a carbonyl group reveals the presence of a complicated mixture of oxidation products: aldehydes, ketones, esters, acids, peresters, and peracids. Spectral analysis also shows that the most favorable site for oxidation is at the methylene group. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 1742–1748, 2000