Relationships Between Polyurethane Elastomer Structure and Ageing Properties: Part 1: Degree of Crosslinking

Abstract

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 M(c ) 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 M(c) values of less than 5,000.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1970
Accession Number
AD0731579

Entities

People

  • B. E. Brokenbrow
  • D. Sims
  • John Wright

Tags

Communities of Interest

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DTIC Thesaurus Topics

  • Biomedical And Dental Materials
  • Chemistry
  • Elastomers
  • Glass Transition Temperature
  • Materials
  • Materials Laboratories
  • Materials Science
  • Mechanical Properties
  • Molecular Weight
  • Plastics
  • Polymer Chemistry
  • Polymeric Films
  • Polymers
  • Polyurethanes
  • Standards
  • Tensile Strength
  • Transition Temperature

Readers

  • Polymer Science and Engineering.