The compositions and sequence distributions of homogeneous styrene (S)–ethyl methacrylate (E) copolymers, obtained by low conversion solution polymerization have been studied by 1H- and 13C-NMR. A new set of peak triad assignments was proposed for the d 2.1–4.2 ppm region in the 1H-NMR spectrum, whereby the reactivity ratios of rS = 0.59 and rE = 0.50 were used to establish this new assignment. The EEE and SSS blocks, present in these copolymers, have a high degree of syndiotacticity (sEE = 0.23, sSS = 0.39), whereas the ESE units are exhibiting a slight tendency toward isotacticity (sES = 0.66).
|Journal||Journal of Polymer Science, Part A: Polymer Chemistry|
|Publication status||Published - 1988|