Bulk and suspension polymerisation of vinyl chloride at high conversion

Microkinetic Modeling of Structural Properties of Poly(vinyl chloride)

“…For reactions [13][14][15][16][17][18][19] in Table 4, rate coefficients have been obtained based on ab initio calculations reported by Purmova et al 10 and Van Cauter et al 24 The ab initio calculated values were taken as initial guesses and adjusted to obtain a good fit to the experimental data reported by Purmova et al 9 The pre-exponential factors of the hydrogen abstraction reactions are taken from Kiparissides et al 16 …”

“…[14][15][16][17][18][19][20][21][22] Generally speaking, the approaches described in literature differ mainly in the level of detail that is considered in the kinetic model and in the method used to account for diffusion limitations.…”

PVC Manufacturing by Suspension Polymerization

“…The above physical picture was contradicted by several researchers, in the fi rst place by Xie and Hamielec [5,7,8] , who proposed a mechanism based on the precipitation and migration of living macroradicals to micropolymeric domains. More recently, Talamini [3,4] reviewed the criticism of his two -phase model, arriving at the conclusion that the objections raised by the other works have limited practical consequences. Dimian et al [9] showed that a similar model is appropriate for simulating the dynamics of large industrial reactors, but with kinetic parameters tuned on experimental data.…”

“…The analysis of Talamini et al [3,4] is presented below. In the case of free -radical homogeneous polymerization the kinetic chain length is given by the relation: …”

“…For estimation purposes one may assume ε = β = 0, C = 0.5 and C M = 5.78exp( − 2768.1/ T ) [3,4] . The computations showed that the results are insensitive to f p / f m as well to K I , which may all be set to one.…”