Synthesis of New Low Temperature Petroleum-Resistant Elastomers
Annual rept. 4 Mar 1971-3 Mar 1972
ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA
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Three petroleum resistant elastomers of polyfluroalkoxyphosphazene, which are suitable for low temperature application have been prepared. The copolymer has a glass transition temperature of -77 C and an initial decomposition point of 300 C in air. The copolymer is very inert chemically and is soluble only in selected fluorocarbon solvents. The material does not burn in air even in a direct flame. Samples were cured to give tensile strengths of 1100 psi and elongations of 280. Several process studies are described. The effect of cyclics on the course of derivatization was studied. The pH DURING HYDROLYSIS APPEARS TO AFFECT THE MOLECULAR WEIGHT OF THE PRODUCT. The removal of salts from the derivatized copolymer by several different methods was investigated.
- Polymer Chemistry
- Elastomers and Rubber