Whilst low concentrations of a relatively inert compound octamethyltet
rasiloxane increase the antioxidant effect of phenyl-beta-naphthylamin
e in low-density polyethylene melt, the effect disappears at greater c
oncentrations of this additive because the latter changes the polymer
structure. The solubility and volatility of phenyl-beta-naphthylamine
correlate with its antioxidant effectiveness.