Relationships Between Polyurethane Elastomer Structure and Ageing Properties: Part 1: Degree of Crosslinking
EXPLOSIVES RESEARCH AND DEVELOPMENT ESTABLISHMENT WALTHAM ABBEY (UNITED KINGDOM)
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The effects of crosslink density on the ageing properties of polyurethane elastomers have been studied using a series of typical polyester and polyether urethanes of Mc values average molecular weight between crosslinks between 2,500 and infinity. While the unaged polyester urethane elastomers showed the highest strengths, the polyether urethane elastomers showed superior hydrolytic stability. An optimum balance between mechanical properties and the resistance to hydrolysis and standard test fluid appeared to be achieved with a relatively high degree of crosslinking ie Mc values of less than 5,000.
- Elastomers and Rubber