Abstract
Styrene-butyl acrylate (S/B) copolymers of different composition were prepared by bulk polymerization using a free radical initiator. Copolymer composition was determined from NMR spectra and monomer reactivity ratios were calculated using the nonlinear least square Error-in-Variable method (EVM). Copolymerization parameters such as triad concentrations, conditional probabilities and number-average sequence lengths in the copolymers were calculated from 13C{1H} NMR spectra. The observed triad sequence concentrations as determined from 13C{1H} NMR spectra were in good agreement with those calculated from the reactivity ratios. Coisotacticity parameter (σ) has been calculated from NMR spectroscopy using oxymethylene resonance signal in 1H NMR spectra.
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