Accession Number : ADA307694

Title :   Development of High-Dielectric-Constant, Low-Dielectric-Loss Polymers Utilizing Gamma Irradiation,

Corporate Author : BATTELLE MEMORIAL INST COLUMBUS OH

Personal Author(s) : Luttinger, Manfred ; Sliemers, Francis A., Jr. ; Kircher, John F. ; Leininger, Robert I.

PDF Url : ADA307694

Report Date : 22 JUL 1964

Pagination or Media Count : 35

Abstract : The polymerization of methyl methacrylate, beta-cyanoethyl acrylate, ethyl vinyl sulfone, and beta-trifluoroethyl vinyl ether and the copolymerization of beta-cyanoethyl acrylate and ethyl vinyl sulfone were investigated for optimum polymer production and purity by radiation and chemical catalytic methods. Dielectric constants and dissipation factors were determined but no significant difference between the dielectric properties of free-radical polymerized polymers prepared by gamma-radiation or by chemical catalysts was discovered. The polymerization of ethyl vinyl sulfone proceeded only with great difficulty and only moderate yields of low-molecular-weight polymers were obtained. The copolymerization of ethyl vinyl sulfone and beta-cyanoethyl acrylate did not improve the yields materially but resulted in a small increase in molecular weights. The dependence of the dielectric constant on the glass transition temperature in the homopolymers and copolymers of these two monomers was defined. beta-Trifluoroethyl vinyl ether was polymerized by gamma-radiation below room temperature at a dose rate of 5 x 10(exp 5) rep per hr and a total dose of 1.6 x 10(exp 7) rep. The attempted radiation polymerization of some allylic monomers, both in the solid and in the liquid state, was unsuccessful. p5

Descriptors :   *POLYMERS, *DIELECTRIC PROPERTIES, *CONSTANTS, *GAMMA RAYS, *LOSSES, *IRRADIATION, RADIATION, OPTIMIZATION, PRODUCTION, METHYL RADICALS, LIQUIDS, POLYMERIZATION, MOLECULAR WEIGHT, DISSIPATION, GLASS, CHEMISTRY, PURITY, TRANSITION TEMPERATURE, ETHERS, MONOMERS, CATALYSIS, FREE RADICALS, DOSE RATE, ACRYLATES, ETHYL RADICALS, VINYL PLASTICS, SULFONES, COPOLYMERIZATION.

Subject Categories : Polymer Chemistry
      Radiation and Nuclear Chemistry
      Plastics
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE