METHOD OF PRODUCING CYANOETHYL ETHERS OF VINYL ALCOHOL POLYMERS

摘要

FIELD: chemistry. ^ SUBSTANCE: method involves cyanoethylation of solid polymers of vinyl alcohol with liquid acrylonitrile in the presence of a sodium hydroxide catalyst at temperature (50-70)C to obtain a solution of cyanoethyl ether, followed by precipitation of the polymer with a liquid precipitation agent. Cyanoethylation is carried out in excess acrylonitrile in molar ratio of acrylonitrile: vinyl alcohol polymer equal to (1.2-1.5):1, until an ether solution in acrylonitrile with viscosity (75-450) Pas is obtained. Said value of viscosity of the solution is maintained by adding acetone until complete dissolution of the polymer. The precipitation agent used is (0.4-1.3)% aqueous solution of a copolymer of vinyl alcohol with vinyl acetate containing (8-12) wt % acetate groups. ^ EFFECT: obtaining cyanoethyl ethers with good dielectric and vibration-absorbing properties. ^ 3 cl, 14 ex, 2 tbl