Abstract
AbstractThe behaviour of different glycols in the solution polymerization of styrene and their effect on the chain transfer step has been studied. The polymerization has been carried out in the homogeneous phase using mixed solvent systems at temperatures of 60, 80, and 100°C. On addition of glycols, the degree of polymerization decreased due to chain transfer and dilution, but when a certain concentration is reached, it gradually increased with increasing glycol concentration. This increase in the degree of polymerization has been attributed to the reduced termination rate resulting from a coiling of the growing polymer chain at higher glycol concentrations. The transfer constants of glycols have been observed to increase with the size of the alkyl groups. Consequently, the chain transfer reaction most probably takes place through the abstraction of H atoms from the alkyl group and not from the OH group of the glycols.
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