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The complexation between styrene (St) and N-phenylmaleimide (PMI) was investigated by ~1H-NMR spectroscopy,and the existence of a complex was proved. The equilibrium constant of St/PMI in chloroform at 50℃ was determined to be0.27. New elementary propagation reactions were proposed. On the basis of the propagation elementary reactions forcopolymerization with the participation of a charge-transfer complex (CTC), a method for measuring the reactivity ratios ispresented. Four reactivity ratios and relative reactivities of free monomer and CTC were obtained. They are r_(12)=0.034. r_(21)=0.012, r_(1C)=0.0030, r_(2C)=0.0034, and k_(1C)/k_(12)=11.34, k_(2C)/k_(21)=3.42.
The complexation between styrene (St) and N-phenylmaleimide (PMI) was investigated by ~ 1H-NMR spectroscopy, and the existence of a complex was proved. The equilibrium constant of St / PMI in chloroform at 50 ° C was determined to be 0.27 . On the basis of the propagation elementary reactions for coopolymerization with the participation of a charge-transfer complex (CTC), a method for measuring the reactivity ratios is presented. Four reactivity ratios and relative reactivities of free monomer and CTC (21) = 0.012, r_ (1C) = 0.0030, r_ (2C) = 0.0034, and k_ (1C) / k_ (12) = 11.34, k_ (2C) /k_(21)=3.42.