TY - JOUR
T1 - Phenols and aromatic amines as thermal stabilizers in polyolefin processing
AU - Pospíšil, Jan
AU - Habicher, Wolf-Dieter
AU - Al-Malaika, Sahar
AU - Zweifel, Hans
AU - Nešprek, Stanislav
N1 - Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2001/12
Y1 - 2001/12
N2 - Scavenging of C- and O-centered free radicals is mandatory in processing stabilization of polypropylene. Phenolic antioxidants act principally as O-radical scavengers only. Aromatic amines, N,N'-disubstituted 1,4-phenylenediamines (PD) and 4,4'disubstituted diphenylamines (DPA), scavenge both C- and O-centered radicals and have consequently a broader activity spectrum. PD cannot be used, however, in polypropylene because of formation of strongly discoloring and staining sacrificial transformation products. Such products formed from DPA have even more discoloring properties. A good processing stability and acceptable extent of discoloration can be achieved by blends of phenols with 4,4'-di-tert.octyl DPA. The effect is considered as a beneficial cooperation between the two chain-breaking antioxidants involving interactions with amine-based transformation products.
AB - Scavenging of C- and O-centered free radicals is mandatory in processing stabilization of polypropylene. Phenolic antioxidants act principally as O-radical scavengers only. Aromatic amines, N,N'-disubstituted 1,4-phenylenediamines (PD) and 4,4'disubstituted diphenylamines (DPA), scavenge both C- and O-centered radicals and have consequently a broader activity spectrum. PD cannot be used, however, in polypropylene because of formation of strongly discoloring and staining sacrificial transformation products. Such products formed from DPA have even more discoloring properties. A good processing stability and acceptable extent of discoloration can be achieved by blends of phenols with 4,4'-di-tert.octyl DPA. The effect is considered as a beneficial cooperation between the two chain-breaking antioxidants involving interactions with amine-based transformation products.
KW - antioxidant
KW - aromatic amines
KW - carbon
KW - diphenylamine
KW - free radical
KW - phenylenediamine
KW - polyolefin
KW - polypropylene
KW - stabilizing agent
UR - http://www.scopus.com/inward/record.url?scp=0035671503&partnerID=8YFLogxK
UR - http://onlinelibrary.wiley.com/doi/10.1002/1521-3900%28200112%29176:1%3C55::AID-MASY55%3E3.0.CO;2-H/abstract
U2 - 10.1002/1521-3900(200112)176:1<55::AID-MASY55>3.0.CO;2-H
DO - 10.1002/1521-3900(200112)176:1<55::AID-MASY55>3.0.CO;2-H
M3 - Article
AN - SCOPUS:0035671503
SN - 1022-1360
VL - 176
SP - 55
EP - 63
JO - Macromolecular Symposia
JF - Macromolecular Symposia
IS - 1
ER -