Polymer/additive compatibility: study of primary antioxidants in PBD

✍ Scribed by Eniko¨ Fo¨ldes; Jan Lohmeijer

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 294 KB
• Volume: 65
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19970725)65:4<761::aid-app14>3.0.co;2-w

✦ Synopsis

Stabilization of polymers involves chemical and physical processes, and the effectiveness of antioxidants is strongly influenced by their compatibility with the host system. In the case of rubber-modified high-impact polymer blends, the dispersed elastomer phase is generally the most sensitive to thermooxidative degradation. The compatibility of five hindered phenolic antioxidants with polybutadiene (PBD) was studied as a function of temperature. Relationships were found between the diffusion rate and the specific volume of additive, as well as the total free-volume of the polymer/additive system. The solubility of antioxidants was evaluated on the basis of thermodynamic theories. Deviations from thermodynamic expectations are explained in terms of different physical states and self-association of the substances investigated.