Free radical solution copolymerization of glycidyl methacrylate with n‐vinyl pyrrolidinone

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Abstract
Copolymers of glycidyl methacrylate (monomer 1) with N‐vinyl pyrrolidinone (monomer 2) were prepared at 70°C in low yield by free radical initiated solution polymerizations in ethyl acetate, 1,4‐dioxane and mixtures of the two solvents. Copolymer compositions were determined by proton nuclear magnetic resonance spectroscopy. Monomer reactivity ratios were then derived using the method of Kelen & Tudos. The magnitude of r1 was relatively unaffected by solvent composition, and ranged from 4.32 to 4.53 in a random fashion. In contrast, values of r2 showed a greater relative (but still random) spread from 0.0075 to 0.0147. Copolymers prepared by batch polymerization are selectively enriched with GMA monomer.