Relationship between chemical structure and performance of primary antioxidants in PBD

Enikö Földes, Jan Lohmeijer

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21 Citations (Scopus)

Abstract

The oxidative degradation of polybutadiene (PBD) prepared by emulsion polymerisation was studied in absence and in presence of hindered phenolic antioxidants (AO). The two additives investigated have similar molecular masses but different chemical structures. AO1 is a fully sterically hindered monophenol with an ester group in the linear chain, while AO2 is a partially hindered bis-phenol, where one of the two tertiary butyl groups is replaced by methyl, and the connecting linear chain contains ester and etheric groups. The effectiveness of the stabilisers was investigated by high temperature oxidative degradation and oven ageing experiments, and was found to be dependent on the sterical hindrance of the phenolic OH. One-side shielding increases the mobility of the hydrogen atom, compared to the fully hindered phenol, which has both beneficial and disadvantageous consequences: the high temperature stabilising efficiency increases at low concentrations, but the additive becomes prone to self-association. This latter effect is reflected in low solubility, limited efficiency at high temperatures, and reduced stabilising effectiveness under oven ageing conditions.

Original languageEnglish
Pages (from-to)31-39
Number of pages9
JournalPolymer Degradation and Stability
Volume66
Issue number1
DOIs
Publication statusPublished - Oct 1999

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ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Polymers and Plastics
  • Materials Chemistry

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