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Mechanisms of antioxidant action: Effects of sulfur compounds on the melt stability of polypropylene
Author(s) -
Scott Gerald,
Shearn Peter A.
Publication year - 1969
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1969.070130701
Subject(s) - antioxidant , polypropylene , sulfur , chemistry , polymer , organic chemistry , chemical stability , polymer chemistry
The effects of a number of sulfur compounds on the melt stability of polypropylene milled at 165°C have been studied. Dilaurylthiodipropionate (DLTP), Mercaptobenzimidazole (MBI), and Mercaptobenzthiazole (MBT) are all antioxidiants in a polymer lightly stabilized with a phenolic antioxidant although the last two are initially pro‐oxidants. 2,2′‐Dibenzoylaminodiphenyldisulfide (22BDD) is a pro‐oxidant under the Conditions studied. In the absence of a phenolic antioxidant the effectiveness of DLTP is reduced in the early stages of oxidation, with increasing concentration although its over all antioxidant activity increases. The results are consistent with the view that both radical and non‐radical processes occur concomitantly.