Mechanisms of antioxidant action: Photo-antioxidant activity of polymer-bound hindered amines. Part I—Bismaleate esters

Bis-(2,2,6,6-tetramethylpiperidin-4-yl) maleate (BPM) has been reacted with polypropylene in the melt to a high level (90%) in the presence of dicumyl peroxide (DCP). Concentrates of polymer bound BPM (BPM-B) were used as masterbatch additives to unstabilised polypropylene and maximal photo-oxidant...

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Bibliographic Details
Published in:Polymer degradation and stability 1988, Vol.22 (3), p.233-239
Main Authors: Al-Malaika, S., Ibrahim, A.Q., Scott, G.
Format: Article
Language:English
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Summary:Bis-(2,2,6,6-tetramethylpiperidin-4-yl) maleate (BPM) has been reacted with polypropylene in the melt to a high level (90%) in the presence of dicumyl peroxide (DCP). Concentrates of polymer bound BPM (BPM-B) were used as masterbatch additives to unstabilised polypropylene and maximal photo-oxidant activity was observed at 70% binding. The photo-antioxidant effectiveness of BPM-B (from the exhaustively extracted masterbatch) was found to be linearly related to its concentration in the polymer up to 70% binding and on a molar basis it is as effective as conventional low molar mass additives. The implication of these results for the theories of antioxidant behaviour in polymers is discussed.
ISSN:0141-3910
1873-2321
DOI:10.1016/0141-3910(88)90013-4