Assuming that in free-radical polymerisation the rate coefficients for initiator dissociation
January 9th, 2018
Assuming that in free-radical polymerisation the rate coefficients for initiator dissociation, propagation and termination can be replaced by the appropriate Arrhenius expressionsk_d = A_d exp (-E_d/RT); E_d = 126 kJ/molk_p = A_p exp (-E_p/RT); E_p = 34 kJ/molk_t = A_t exp (-E_t/RT); E_t = 10 kJ/molcalculate the changes in the rate of the polymerisation and the degree of polymerisation caused by increasing the temperature of polymerisation of styrene in benzene, initiated by azobisisobutyronitrile from 60 degC to 70 degC. Assume that the concentration of monomer and initiator and the values of f and q remain unchanged when the temperature increases.