PENULTIMATE MODEL DESCRIPTION OF THE PROPAGATION KINETICS FOR THE FREE-RADICAL COPOLYMERIZATION OF STYRENE AND METHYL-METHACRYLATE

Recently experimental data on the free radical copolymerization of sty rene and methyl methacrylate in bulk were shown to obey penultimate mo del kinetics. These data were now reevaluated with respect to copolyme rization parameters by means of a simultaneous fit of the penultimate model both to the copolymer composition and to the overall propagation rate coefficient, and in dependence on the monomer feed composition. Different simultaneous fit procedures were used and compared. The foll owing parameters are finally suggested: r11 = 0,498; r21 = 0,589; r22 = 0,463; r12 = 0,547; s1 = 0,478 and S2 = 0,256.