The stereochemical structures of samples of poly(ethyl acrylate) (PEA), poly(butyl acrylate) (PBuA) and poly(2-ethylhexyl acrylate) (PEHA), prepared by group transfer and anionic polymerization, were studied by 13C and 1H n.m.r, spectroscopy. The main-chain CH 2 spectral range was analysed by the application of the inverse 13C-1H HETCOR two-dimensional n.m.r, technique. A very similar HETCOR pattern was found for all polymers studied. In all cases, main-chain CH2 lines in the 1H and 13C n.m.r, spectra could be assigned to configurational tetrads; for PEA and PBuA a partial assignment of carbon resonances to configurational hexads was possible. While PEHA prepared both by group transfer and anionic polymerization and PEA prepared by group transfer polymerization can be well approximated by Bernoullian statistics, for PEA and PBuA prepared by anionic polymerixation a first-order Markov model is required to fit the observed intensities at the hexad level.
Посилання на статтю:
Stereochemical structures of some polyacrylates studied by one-dimensional and two-dimensional 13C-1H n.m.r. spectroscopy / Milo~ Suchopbrek, Jifi Sp~vb6ek* and Bohumil Masaf // Polymer. – 1994. – Vol 35. – P. 3389-3397.