Synthesis of poly(methylmethacrylate) macromonomers prepared by radical chain transfer reaction H NMR study of macromonomer end-groups

摘要

The end-group analysis for both PMMA telomers having a carboxyl end-group and macromonomers derived from these telomers was carried out using ~1H NMR. Telomers were prepared by telomerization of methyl methacryalte (MMA) with thioglycolic acid (TGA) initated with 2,2' azobis(isobutyronitrile) (AIBN) in acetontrile at 70 deg C. Then, macromonomers were obtained by reaction of the telomer carboxylic acid end-group with glycidyl methacrylate (GMA) using a chromium salt as catalyst. From the ~1H NMR study, it was found that the telomer/macromonomer conversion results from two ways of epoxy addition (#alpha# and #beta#), as observed in a model reaction between GMA and octanoic acid (OA).