Physics, 22.02.2020 03:06, fattypickeltoefungus

Assuming that in free-radical polymerization the rate coefficients for initiator dissociation, propagation and termination can be replaced by the appropriate Arrhenius expressions kd = Ad exp (−Ed /RT) kp = Ap exp (−Ep /RT) kt = At exp (−Et /RT) calculate the changes in the rate of polymerization and the degree of polymerization caused by increasing the temperature of polymerization of styrene in benzene, initiated by azobisisobutyronitrile, from 60 °C to 70 °C given that: Ep = 34 kJ mol−1 Et = 1 kJ mol−0 1 Ed = 126 kJ mol−1 Assume that the concentration of monomer and initiator and the values of f and q remain unchanged when the temperature is increased.

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Assuming that in free-radical polymerization the rate coefficients for initiator dissociation, propa...