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Antioxidants and stabilizers—LXXV. Effect of 2,6-ditert.-butyl-4-methylphenol on the photooxidation of high-impact polystyrene

✍ Scribed by J. Virt; L. Rosík; J. Kovářová; J. Pospišil

Publisher
Elsevier Science
Year
1980
Tongue
English
Weight
476 KB
Volume
16
Category
Article
ISSN
0014-3057

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✦ Synopsis

High impact polystyrene (HIPS) was used in an investigation of the stabilizing effect of 2,6-ditert.-butyl-4-methylphenol (I, BHT) in photooxidation. Changes in the polymer due to photooxidation were examined by reflexion spectroscopy in the u.v. and visible ranges, and by i.r. spectroscopy. It was shown that BHT, 3,5,3',5'-tetratert.-butylstilbenequinone (II) and 2,6-ditert.-butyl-l,4-benzoquinone (I11), which are important products of the transformation of BHT, possess specific stabilizing properties. Using DSC, it was demonstrated that I-III interfere with the photooxidative process mainly because of their antioxidative properties. In the overall mechanism of action of I in the stabilization of HIPS, the predominant role is played by its major transformation product i.e. quinone I1.

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