COPOLYMERS OF N-VINYLCARBAZOLE AND N,N-DIMETHYLAMINOETHYL METHACRYLATE

Copolymers of N-vinylcarbazole (NVC) and N,N-dimethylaminoethyl methac rylate (DNAEMA) were prepared by free-radical polymerization in a tolu ene solution at 60 degrees C using 2,2'-azobisisobutyronitrile (AIBN) as an initiator. The reactivity ratios of both monomers were calculate d using the extended Kelen-Tudos method and found to be r(1) = 0.441 = /- 0.052 and r(2) = 1.632 +/- 0.102. The microstructure of copolymer c hains is described on the basis of first-order Markov statistics. The microstructure of copolymers was also studied by UV and H-1-NMR spectr oscopy. Copolymers were characterized by viscosity and number-average molecular weight ((M) over bar(n)) measurements. The glass transition temperatures (T-g) of the copolymers were determined calorimetrically and the variation of T-g with the copolymer composition is discussed. (C) 1997 John Wiley & Sons, Inc.