Non-stationary rate

For example, supported TiCl4/MgCl2 catalysts show a short period of acceleration, followed by a prolonged steady period 92,93). However, in the presence of electron donors, they may show the typical decay rate kinetics observed during propylene polymerization 93). Bulk catalysts prepared by interaction of TiCU with Mg(OR)2 show either a stationary rate, or a non-stationary rate, according to the titanium content 88,94). Bulk catalysts prepared by reduction of TiCl4 with organomagnesium compounds show a decay type rate 92-95>. 

The basic principle behind the preparation of a stable mini-emulsion lies in the decrease of solubility of monomer in the aqueous phase. This approach was applied to the fine emulsion polymerization and copolymerization of MMA, EA, nonyl methacrylate (NMA) and methacryloyl-terminated polyoxyethylene macromonomer (PEO-MA) initiated by UV light at room temperature by Capek [121,122]. At low temperature, the monomer droplet degradation is suppressed due to the lower water-solubility of monomer. Under these circumstances, the dependence of the rate of polymerization of MMA, EA or NMA is described by a curve with two maximal rates or four distinct non-stationary rate intervals, typical for the mini-emulsion polymerization. The effect of the restricted monomer droplets degradation is also considered as the result of accumulation of hy-... 

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