Journal ArticleDOI
Analysis of nonvolatile oxidation products of polypropylene. III. Photodegradation
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TLDR
The nonvolatile oxidation products of photodegraded polypropylene have been analyzed by infrared spectroscopy and chemical reactions as discussed by the authors, and the major functional group is ester followed by vinyl alkene, then acid.Abstract:
The nonvolatile oxidation products of photodegraded polypropylene have been analyzed by infrared spectroscopy and chemical reactions. The major functional group is ester followed by vinyl alkene, then acid. In comparison, thermally oxidized polypropylene contains relatively more aldehyde, ketone, and γ-lactone and much less ester and vinyl alkene. Photodegraded polyethylene contains mostly vinyl alkene followed by carboxylic acid. Gel-permeation chromatography (GPC) determined the decrease in polypropylene molecular weights with exposure time. A calculation determined that there is one functional group formed per chain scission; in thermal oxidation there are two groups formed per scission.read more
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Journal ArticleDOI
The Photooxidative Degradation of Polypropylene. Part I. Photooxidation and Photoinitiation Processes
D. J. Carlsson,D. M. Wiles +1 more
TL;DR: The rates of photooxidative deterioration vary enormously with polymer structure, and range from a few months outdoor lifetime for polypropylene (PPH) and poly(l,3-phenylene isophthalamide) up to several years for poly(ethylene terephthalate), poly(methyl methylacrylate), and poly-(tetrafluoroethylene) as mentioned in this paper.
Journal ArticleDOI
UV aging of poly(propylene)/wood‐fiber composites
TL;DR: In this article, the effect of accelerated UV-aging on properties of PP/wood-fiber composites has been studied, and the results showed that both the unfilled PP and the PP-wood fiber composites displayed good UV resistance with regard to mechanical properties.
Journal ArticleDOI
Outdoor and accelerated laboratory weathering of polypropylene: A comparison and correlation study
TL;DR: In this article, the degradation behaviors under outdoor and accelerated laboratory weathering conditions of isotactic polypropylene (iPP) were compared, aiming to establish a correlation between both weathering types.
Journal ArticleDOI
Influence of the exposure parameters on the mechanism of photooxidation of polypropylene
TL;DR: In this article, the degradation structures of polypropylene were analyzed by FTIR techniques coupled with chemical derivatization to quantify the formation of the final photoproduct resulting from the hydroperoxides.
Journal ArticleDOI
Ultra-violet degradation of polypropylene: 1. Degradation profile and thickness of the embrittled surface layer
G.E. Schoolenberg,P. Vink +1 more
TL;DR: In this paper, the formation and consequences of the embrittled surface layer in artificially ultra-violet (u.v.) degraded polypropylene (PP) samples were investigated by visual inspection, infra-red spectrometry and mechanical testing.
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