- Acrylated Bis-Phenols
Radical scavengers are antioxidants capable of trapping radicals. Scavenging of
alkyl radicals would immediately inhibit the autoxidation cycle. Under oxygen deficient
conditions alkyl radical scavengers contribute significantly to the stabilization
of the polymer. Scavenging the extremely reactive alkoxy and hydroxy radicals is
practically not possible.
Carbon centered radical scavengers, such as lactones
and acrylated bis-phenols, are extremely
effective in oxygen deficient environments.
Lactones (Benzofuranone derivatives) are powerful radical scavengers. Even when
added in small amounts, they help control melt stability during polymer processing.
Substituted Benzofuranone are excellent radical scavengers. They are mainly used
in combination with phenolic compounds and phosphite to provide materials excellent
performance even at low concentrations.
Acting as traditional hindered phenols, acrylate functionalized hindered phenols
are efficient C-radical scavengers.
Acrylated Bis-Phenols - Mechanism
They are very effective in preventing styrene copolymers from crosslinking or degrading
during processing, particularly under oxygen deficient conditions. They are usually
used in conjunction with other stabilization chemistries.