Abstract
The homepolymerization and copolymerization of propargyl acrylate (PA), methacrylate (PMA) and crotonate (PC) has been studied by using azobisisobutyronitrile (AIBN) as an initiator under the various conditions. The homopolymerization of PA and PMA was carried out at 60°C in benzene and the initial rate of polymerization (Rp) was represented by the following equation,
Rp=k [AIBN] 0.8 [M] 1.6
where [M] is monomer concentration.
PA, PMA and PC were copolymerized with styrene (St), methyl methacrylate (MMA) and acrylonitrile (AN) as reference monomers, and it has been found that the rate of polymerization of these systems decreases remarkably, as the mol fractions of PA, PMA and PC in the comonomer increase. The monomer reactivity ratios, r1 and r2 values, were as follows at 60°C respectively.
PA-St (M1): r1=0.45, r2=0.24, PMA-St (M1): r1=0.30, r2=0.45, PA-MMA (M1): r1=1.12, r2=0.05, PMA-MMA (M1): r1=0.96, r2=0.79, PA-AN (M1): r1=0, 95, r2=1.49, PMA-AN (M1): r1=0.15, r2=1.75, PC-St (M1): r1=3.42, r2=0.00.
