Abstract
The ϵ-caprolactam polymerization below the polymer melting point (180°) is described. The influence of the concentration of the catalyst (sodium hydride) and of the initiator (acetyl-caprolactam) on both polymer viscosity and conversion are given as a function of the polymerization time. From these data, it seems probable that initially there is only a step-addition polymerization; subsequently, transamidation reactions exert their influence especially if a fluid phase is present. This hypothesis is confirmed by consideration of the behaviour of the polymerization in the molten state (220°).
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