SYNTHESIS AND PROPERTIES OF MULTIACRYLIC RESINS FROM EPOXY-RESINS

The action of methacrylic acid onto tetraglycidyl methylene dianiline, tetraglycidyl sulfone dianiline, triglycidyl triphenylmethane (TACTIX ), and epoxy novolac resins was performed using different catalysts. I n each case, a comparative study of these catalysts was investigated d epending upon the polarity of the solvent and of the temperature. Chro mium complexes are better in low polar solvents. The reactions were mo nitored by H-1-NMR, by epoxide titration, and by size exclusion chroma tography (SEC), and the reactivity of these resins could be compared. Finally, the study of these materials obtained after radical and photo chemical cross-linking, especially by dynamic mechanical analysis (DMA ), shows that these materials exhibit high T-g's (200 degrees C for me thacrylated TACTIX) compared to those of the corresponding multiepoxid es cured by diamines. (C) 1993 John Wiley and Sons, Inc.