Impact of Dilution on the Rate Constant of Termination in Nitroxide-Mediated Polymerization

摘要

The variation of viscosity with conversion was determined for a series of five experiments carried out at 120°C and different dilutions. Styrene was the monomer chosen for this study and MONAMS, a monoalkoxyamine based on N-tert-butyl-N-(1-diethylphosphono-2,2-dimethylpropyl)-N-oxyl (SG1), served as initiator. Unexpectedly, the rate constant of termination was found to vary with the initial dilution of the medium, but to remain unchanged with the viscosity build-up induced by monomer conversion.