URETHANE-UREA ELASTOMERS FOR LOW-TEMPERATURE, OIL AND FUEL RESISTANT APPLICATIONS.
ARMY WEAPONS COMMAND ROCK ISLAND ILL SCIENCE AND TECHNOLOGY LAB
Pagination or Media Count:
Millable polyether urethane-urea elastomers having good low-temperature flexibility and oil resistance were prepared on a semiplant scale and evaluated. These elastomers were also compounded and evaluated in specific end-item applications. Results showed that semiplant quantities and scaled-up processing methods can duplicate results obtainable on a laboratory scale. These elastomers had poor resistance to fuels high 40 percent or greater in aromatic content. Various thioether, chloro-substituted ether, and pyridyl modified glycols were evaluated in urethane-urea millable gum preparation to improve aromatic fuel resistance while retaining desirable properties such as low-temperature flexibility and tensile strength. Thioethers offer considerable promise but further work with thioethers, chloro - and fluoro-substituted ethers, and various glycol blends is considered necessary before the potential and the shortcomings of these materials, in preparation of a fuel-resistant elastomer, can be realized. Author
- Elastomers and Rubber