Coating Formation by Spontaneous Polymerizaiton on Aluminum: Various Monomers

摘要

Spontaneous polymerization to give conformal, uniform coatings on metals has been expanded to a series fo different monomers. The monomer 4-fluoro maleimide, when copolymerizaed with styrene, a coupling agent, and a bis-maleimide crosslinker, imparts very low dielectric constant (2.4) to the coating while retaining high temperature resistance. Diethyl fumarate, with the same comonomers, enhances ductility and provides an adjustable glass transition temeprature. Additionof glycidyl acrylate to the monomer system provides reactivity of teh coating to epoxy resins. Kinetic studies using these monomers were consistent with the free radical polymerization mechanism. The rate of reaction seemed limited by the diffusion of species to the reaction site Extent fo incorporation of the new monomers into the chain backbone was verified, and adhesion and corrosion resistance properties examined. The data illustrate the versatility of the conformal, chrome free spontaneous polymerization process.