Development of High-Dielectric-Constant, Low-Dielectric-Loss Polymers Utilizing Gamma Irradiation,
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
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 22, 1964
- Accession Number
- ADA307694
Entities
People
- Francis A. Sliemers Jr.
- John F. Kircher
- Manfred Luttinger
- Robert I. Leininger
Organizations
- Battelle Memorial Institute