17089

Atom Transfer Radical Polymerization of Methyl Acrylate with PVAc-CCI3 Macroinitiator and a Novel Synthesis of Block Terpolymers of PVAc-b-poly(MA-co-MMA)

Semsarzadeh Mohammad Ali نويسنده , Rostami Daronkola Mohammad Reza نويسنده

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The atom transfer radical polymerization of methyl acrylate (MA) with poly vinylacetate telomer (PVAc-CCI3) as a macroinitiator and CuCI/N,N,Nי,Nי,N"-pentamethyldiethylenetriamine (PMOETA) as a catalyst was successfully carried out in the bulk. The reaction temperature had a direct effect on the conversion and apparent propagation rate constant (Kpapp) of MA polymerization reaction. In this study the apparent enthalpy of activation and enthalpy of equilibrium are 83.68 and 65.98 kJ/mol, respectively. for this polymerization reaction. In a similar polymerization system, PVAc-CCI3 macroinitiators were used with several molecular weights, it was found that the rate of polymerization was independent of molecular weight of the macroinitiator, but the percentage of telomer used had a direct effect on the Kpapp of this polymerization. In all reactions studied the first order kinetics showed a linear dependence, indicating a constant number of propagating species during the polymerization. Kelen-Tudos and Fineman-Ross linear methods were used to determine monomerschemicalreactivityof methylacrylate and methyl methacrylate inatom transfer radical polymerization.The synthesized block copolymers showed a relatively narrow molecular weight distribution (1.1