Polymerization of (p-vinylphenyl)hydrogalvinoxyl and formation of a stablepolyradical derivative

4-[(3,5-Di-tert-butyl-4-hydroxyphenyl)(3 2,5-di-tert-butyl-4-oxo-cyclohexa- 2,5-dienylidene)methyl]styrene (abbreviated as (p-vinylphenyl)hydrogalvinox yl) was polymerized using AIBN as an initiator to give a bright yellow poly mer with <(M)over bar (w)> = 3.2 x 10(4). The polymer was oxidized to give the corresponding polyradical derivative, whose spin concentration could be increased up to about 70 mol % depending on oxidative conditions. ESR sign al line-width in the solid state was greatly increased below 200 K for the polyradical with a high spin concentration (> 50 mol %). The magnetization and magnetic susceptibility indicated weak antiferromagnetic interaction am ong the radical sites. (C) 1999 John Wiley & Sons, Inc.