Structural investigations of poly(methyl methacrylate) by two-dimensional NMR

In the present paper a comprehensive microstructure analysis of PMMA based on the combination of one-dimensional and twodimensional (TOCSY, HSQC, and HMBC) NMR experiments is reported. To resolve complex resonance assignments, empirical chemical shift modeling supported by the 2D NMR spectroscopy has been done. Rigorous assignments of resonance signals have been done by investigating the one bond couplings between carbon/proton nuclei by the HSQC (heteronuclear single quantum coherence) and two bond proton/proton couplings by TOCSY (total correlation spectroscopy) experiments. Investigations of the two and three bond order carbon/proton couplings from HMBC (heteronuclear multi bond correlation) spectrum are reported. q 2004 Elsevier B.V. All rights reserved.