STRUCTURE, DYNAMICS AND INTERACTIONS IN POLYMER SYSTEMS AS STUDIED BYNMR-SPECTROSCOPY

The possibilities of NMR spectroscopy in studies of interactions in po lymer systems are demonstrated on the example of two types of macromol ecular complexes: (i) By measuring H-1 NMR high resolution line intens ities, the formation of ordered associated structures of syndiotactic (s) poly(methyl methacrylate)(PMMA) in mixed solvents was quantitative ly characterized. The obtained results permit us to assume that the me chanism by which the solvent affects self-association of s-PMMA involv es specific interactions of the solvent molecules with PMMA units. Sol id state high resolution C-13 NMR spectra of associated s-PMMA gels we re also measured and compared with the spectra of a solid s-PMMA sampl e. (ii) By using C-13 solid state NMR spectroscopy, the differences in the structure of the amorphous and crystalline phases in pure poly(et hylene oxide) and its complexes with p-dichlorobenzene or p-nitropheno l were characterized. Prounounced differences also in the dynamic stru cture of the crystalline phase in these systems are indicated by the r elaxation times T1(C), T1rho(C) and T1rho(H).