Abstract
AbstractThe role of different glycols for the overall kinetics and particularly for the chain transfer step in the addition polymerization of methyl methacrylate has been studied. The polymerization of methyl methacrylate has been carried out in the homogeneous phase using mixed solvent systems at 60 and 80°C. The degree of polymerization has been found to decrease owing to chain transfer and dilution but after a certain concentration, it gradually increased with increasing glycol concentration. This increase in the degree of polymerization has been attributed to a reduced termination rate resulting from the coiling of the growing polymer chain at higher glycol concentrations. The chain transfer constants of glycols have been found to increase with the size of the alkyl groups indicating thereby that the chain transfer probably occurs via the abstraction of an H atom from the alkyl group and not from the OH group of the glycols.
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