Abstract

This paper summarizes a study on the time-dependent growth of complex viscosity during the anionic ring-opening polymerization of caprolactam employing isophthaloyl-bis-caprolactam and caprolactam-magnesium-bromide as initiator and catalyst. The complex viscosity of the system—nylon 6 polymerizing in its monomer—has been defined over the temperature range of 120–160°C by in situ mixing and polymerizing two caprolactam streams, one containing initiator, the other containing catalyst, between oscillating platens of a Rheometrics rheometer. Isothermal rheometry at five temperatures was accomplished for one initiator/catalyst combination.

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