EVALUATION OF ELASTIC THERMOPLASTIC MATERIALS.
Abstract
Elastic thermoplastic copolymers of styrene-butadiene, ethylene-vinyl acetate, ethylene-ethyl acrylate and several polyurethanes were evaluated for potential applications in Army end items. The physical properties of polyurethane thermoplastics were found to closely approximate those of vulcanized rubber. Except for ester type thermoplastic urethanes, elastic recovery (as indicated by compression set) of thermoplastic materials was poor at 158 F. Efforts were made to crosslink these materials by irradiation and chemical techniques but improvement in compression set did not result. Hydrolytic stability of thermoplastic copolymers of ethylene-ethyl acrylate, ethylene-vinyl acetate, ethylene-metallic carboxylate, ethylene-propylene, ethylene-butadiene, styrene-butadiene and vulcanized SBR was excellent. Hydrolytic stability of ether based thermoplastic urethane was good. Ester based thermoplastic and vulcanized rubber type urethanes showed poor hydrolytic stability. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1967
- Accession Number
- AD0817449
Entities
People
- Elmer I. Spearman