SIB POLYMER DEVELOPMENT.
Final rept. 1 Feb 65-31 Jan 66,
OLIN MATHIESON CHEMICAL CORP NEW HAVEN CONN CHEMICALS DIV
Pagination or Media Count:
Selected members of the SiB polymer family were developed for high temperature applicable elastomers. Three measurements, namely tensile strength, elongation, and hardness, were performed from -80F to 800F other characteristics were obtained on specific specimens. With the proper selection and concentration of reinforcing fillers and antioxidants ferric or tungsten oxide are indispensable, vulcanizates of SiB-2 and SiB-4 rubber exhibit outstanding heat-aging resistance. They show a tensile strength of 400-450 psi. and an elongation of 100-150 at ambient temperature, and withstand temperatures of 800 to 900F in air, demonstrating a useful life of 24 hours and 2 hours, respectively. They were still flexible at -40 to -80F, indicating a wide range of elasticity. Limited experimentation indicated their immunity to humidity and water immersion. The solvent resistance was improved by introduction of a minute number of chloromethyl groups. Dielectric constants approached those of the silicones. Since the uncured SiB elastomers can be molded or extruded, special applications such as wire coating, gasket and O-ring fabrication can be envisioned.
- Polymer Chemistry
- Elastomers and Rubber