چكيده لاتين :
Atom transfer radical copolymerization of methyl acrylate (MA) and methyl
methacrylate (MMA) with PVAc-CCl3 telomer as macroinitiator and
CuCl/N,N,Nי,Nי,Nיי-pentamethyldiethylenetriamine (PMDETA) catalyst system in
bulk at 80؛C was investigated. The molecular structure of the poly(vinyl acetate-b-MAco-
MMA) block terpolymers were characterized by 1H NMR and FTIR spectroscopies
and gel permeation chromatography (GPC). The composition and end chain functionality
of MA units in terpolymer increased with mole fraction of MA in the feed. The chain configuration of terpolymer indicated that the syndiotacticity of MMA repeating unit in
terpolymer increased from 31.9 to 52.5 with MMA mole fraction in the feed. The experimental
and theoretical number average molecular weights of terpolymer were
studied. The molecular weight distributions of the synthesized block terpolymers were
narrowed from 1.77 in macroinitiator to about 1.27-1.44. The theoretical number average
molecular weight of terpolymer increased with overall molar conversion and composition
of MMA unit in terpolymer. The overall propagation rate constants in ATRP of
MA and MMA were calculated and increased with mole fraction of MA in the feed.
