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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
Author(s) -
Kříž Jaroslav,
Stehlíček Jaroslav,
Dybal Jiří,
Hauer Jan,
Schmidt Pavel
Publication year - 1996
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1996.021970204
Subject(s) - chemistry , dimethyl sulfoxide , dimer , monomer , solvation , dissociation (chemistry) , mndo , polymer chemistry , raman spectroscopy , anionic addition polymerization , nuclear magnetic resonance spectroscopy , sulfoxide , polymerization , photochemistry , polymer , molecule , organic chemistry , physics , optics
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.