Premium
Organic Phosphites as Polymer Stabilizers
Author(s) -
Habicher Wolf D.,
Bauer Ingmar,
Pospíšil Jan
Publication year - 2005
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200550712
Subject(s) - chemistry , intramolecular force , primary (astronomy) , stabilizer (aeronautics) , amine gas treating , radical , hydrolysis , polymer , phenols , organic chemistry , phenol , antioxidant , alkoxy group , combinatorial chemistry , mechanical engineering , physics , alkyl , astronomy , engineering
The antioxidative action of phosphonites and phosphites depends on their structure, the nature of the polymer to be stabilized and the aging conditions. Phosphorus compounds can act in different ways: as hydroperoxide decomposers (secondary antioxidants), as free‐radical scavengers (primary antioxidants), as well as metal‐complex forming agents. The stabilizing action of phosphites and phosphonites is due to three basic mechanisms: oxidation by hydroperoxides, substitution by alkoxyl radicals and hydrolysis to acidic phosphorus compounds and phenols. Modification of phosphites with additional functional groups such as hindered amine moieties leads to new stabilizing properties. An intramolecular synergistic effect is observed.