Copolymerized Antioxidants in Polyether-Ester Elastomers

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Abstract
Antioxidants copolymerized into polyether-ester elastomers increase the resistance of the elastomers to degradation by heat aging. Resistance to heat aging increases as antioxidant content increases, with no bloom formation at high antioxidant content. The addition of a small amount of a nonbound amine antioxidant further increases the resistance to heat aging of elastomer protected by copolymerized phenolic antioxidant. The 3,5-di-t-butyl-4-hydroxybenzenepropanamido structure is a more effective antioxidant in these polyether-ester elastomers than the 3,5-di-t-butyl-4-hydroxybenzamido structure.

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