Add time:09/06/2019 Source:sciencedirect.com
An investigation has been made of forty-two 4,4′-isopropylidenebisphenols, substituted with alkyls, phenyls or halogens, for the stabilization of isotactic polypropylene at 180°; the basic effects of substituents on antioxidant activity have been determined. Substituents with −I-effect decrease activity compared with the unsubstituted 4,4′-isopropylidenebisphenol. The generally favourable effect on activity found for substituents with +I-effect is limited, on the one hand, by the number and character of the substituents, and on the other hand, by the position of substitution. There is a general rule that symmetrically disubstituted derivatives have a very high antioxidant activity. On the other hand, disubstitution in positions 2,6 in one nucleus, and especially in both nuclei of 4,4′-isopropylidenebisphenol, has a very unfavourable effect.
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