Abstract
The tris(π-allyl)chromium—pyridine system was found to be a good catalyst for the polymerization of MMA with quantitative yield. The kinetics and the mechanism of the polymerization were studied dilatometrically and gravimetrically at 0°C. Analysis of the data on the molecular weight of PMMA and of kinetic data showed that the initiation reaction was relatively fast and the termination reaction was negligible. The propagation rate constant was about 1.7 M−1 sec−1. The copolymerization of MMA with styrene (1:1) resulted in homopolymerization of MMA. This indicates that the mechanism is of an anionic type. The activating effect of pyridine taken in great excess with respect to the chromium compound (800: 1) excludes the possibility of the coordinate-anionic mechanism of the polymerization of MMA.
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