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Study of the propagation centre in the anionic polymerization of lactams, 1. Spectroscopic and theoretical study of the activated monomer in dimethyl sulfoxide

✍ Scribed by Jaroslav Kříž; Jaroslav Stehlíček; Jiří Dybal; Jan Hauer; Pavel Schmidt

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
689 KB
Volume
197
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Solutions of Li, Na and K salts of 3,3‐dimethyl‐2‐piperidone and ε‐caprolactam in dimethyl sulfoxide‐d~6~ were studied by ^6^Li, ^7^Li, ^23^Na, ^1^H and ^13^C NMR, Raman spectroscopy and MNDO molecular orbital calculations. Using NMR relaxation, the dynamics and equilibrium states of solvation, dissociation and cation exchange were clarified. At concentrations above, 0,1 mol/L, molecular aggregation to a dimer and possibly higher aggregates has been found.

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