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Comparison of the photo-oxidative behaviour of some polybutadiene-based polyblends

✍ Scribed by Gerald Scott; Menashe Tahan

Publisher
Elsevier Science
Year
1977
Tongue
English
Weight
488 KB
Volume
13
Category
Article
ISSN
0014-3057

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✦ Synopsis

The photo-oxidative degradation of ABS, MBS and MABS were compared using i.r. and u.v. spectroscopy, gel permeation chromatography, colour measurement and falling weight impact tests. The photo-oxidative processes were essentially similar, the rates being determined primarily by the initial concentration of unsaturated groups. The unsaturated species were initially converted, by photoiytic and photo-oxidative chain scission reactions, into unsaturated carbonyl compounds which led to diseolouration. Unsaturated carbonyl also enhanced the cross-linking reactions resulting in a loss of unsaturation, loss of the rubber phase elasticity and loss of the polyblend impact resistance.

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