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Studies in addition polymerization in mixed solvent system part V. Chain transfer of short chain aliphatic alcohols in the polymerization of methyl methacrylate and styrene

1971; Wiley; Volume: 149; Issue: 1 Linguagem: Inglês

10.1002/macp.1971.021490118

0025-116X

Bhupati Ranjan Bhattacharyya, Uma Shankar Nandi,

Analytical Chemistry and Chromatography

Abstract Studies on Polymerization in the presence of alcohols has been carried out using mixed solvent system. It is observed that chain transferring capacity of the aliphatic alcohols do increase with the size of the alkyl group, the order being methyl alcohol < ethyl alcohol < n ‐propyl alcohol < iso ‐propyl alcohol. The results indicate that α‐hydrogen abstraction from the substrate is effective. The chain transfer constants obtained from the conventional plot of 1/P̄ against S/M is in fair agreement with the values computed from the estimation of hydroxyl end group in the polymer by dye‐partition technique. The increasing transfer constant values in the alochol series with increase in the number of carbon atoms is explained on the basis of probability of available hydrogen atom in the alkyl group. It is also observed that the chain transfer values are affected due to precipitation of polymer. Thermodynamic parameters have been computed from the chain transfer values of alcohols at different temperatures.