Abstract
Classic theory of free radical polymerization is based on two assumptions. The first is that the concentration of initiator is slightly changed and could be taken as a constant value. The second assumption is that the rate of initiation is equal to the rate of termination. Equation for the polymerization rate based on these assumptions can not successfully describe the initial stage of free radical polymerization. In order to solve this problem, three mathematical models were developed and used to verify of the mentioned assumptions. The models were fitted to experimental data and qualities of their fits were compared. Experimental data of isothermal bulk polymerization of methyl methacrylate were obtained by differential scanning calorimetry at 60, 70, 80 and 90?C with initiator concentration (AIBN) of 0.5 wt%. The best fit was shown by the model that assumes constant concentration of initiator during initial stage but takes into account that the rate of initiation is not equal to the rate of termination at the beginning.
Highlights
The classic theory of free radical polymerization is based on two assumptions
We have shown that Model 0, based on the assumptions of the classic theory does not satisfactorily describe the initial stage of radical polymerization, i.e. the beginning of the Differential scanning calorimetry (DSC) thermogram of isothermal methyl methacrylate polymerization
We have developed three models in order to describe the initial part of the DSC thermogram and tested them with experimental results
Summary
The classic theory of free radical polymerization is based on two assumptions. The first is that the concentration of the initiator is slightly changed and could be taken as a constant value. EFFECT OF TEMPERATURE ON INITIAL STAGE OF METHYL METHACRYLATE FREE RADICAL BULK POLYMERIZATION The classic theory of free radical polymerization is based on two assumptions. The equation for the polymerization rate based on these assumptions cannot successfully describe the initial stage of free radical polymerization.
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