Miscible macromolecular antioxidants for polyethers

Citation
Mm. Coleman et al., Miscible macromolecular antioxidants for polyethers, J MACR S PH, B38(4), 1999, pp. 403-417
Citations number
29
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
JOURNAL OF MACROMOLECULAR SCIENCE-PHYSICS
ISSN journal
00222348 → ACNP
Volume
B38
Issue
4
Year of publication
1999
Pages
403 - 417
Database
ISI
SICI code
0022-2348(1999)B38:4<403:MMAFP>2.0.ZU;2-R
Abstract
Oxidation reactions are one of the main reasons for the failure of polymeri c materials. Antioxidants, compounds designed to protect against oxidation, must meet three main requirements for success: (1) an efficient antioxidat ive mechanism, (2) compatibility with the oxidizing polymer, and (3) perman ence within the oxidizing polymer. Common antioxidants are low molecular we ight materials that can easily diffuse, leach, or evaporate from the polyme r they are designed to protect. An increase in the molecular weight of the antioxidant not only decreases diffusion and volatility, but also decreases compatibility since most high molecular weight polymers will not mix. Sele ctive sterically hindered phenolics, however, are concurrently antioxidants and "compatibilizers" through hydrogen bond formation. Carefully designed copolymers containing a small percentage of 2,6-diisopropyl-4-vinylphenol w ere found to mix intimately with two readily oxidizing polyethers and to pr otect them against oxidation.