Premium
Structure, dynamics and interactions in polymer systems as studied by NMR spectroscopy
Author(s) -
Spĕvác̆ek Jir̆í,
Straka Jaroslav
Publication year - 1993
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19930720115
Subject(s) - tacticity , nuclear magnetic resonance spectroscopy , polymer , methyl methacrylate , amorphous solid , nmr spectra database , solvent , spectroscopy , materials science , ethylene oxide , relaxation (psychology) , solid state nuclear magnetic resonance , molecule , transverse relaxation optimized spectroscopy , phase (matter) , polymer chemistry , chemistry , crystallography , spectral line , nuclear magnetic resonance , fluorine 19 nmr , monomer , organic chemistry , copolymer , polymerization , psychology , social psychology , physics , quantum mechanics , astronomy , composite material
The possibilities of NMR spectroscopy in studies of interactions in polymer systems are demonstrated on the example of two types of macromolecular complexes: (i) By measuring 1 H NMR high resolution line intensities, the formation of ordered associated structures of syndiotactic (s) poly(methyl methacrylate)(PMMA) in mixed solvents was quantitatively characterized. The obtained results permit us to assume that the mechanism by which the solvent affects self‐association of s‐PMMA involves specific interactions of the solvent molecules with PMMA units. Solid state high resolution 13 C NMR spectra of associated s‐PMMA gels were also measured and compared with the spectra of a solid s‐PMMA sample. (ii) By using 13 C solid state NMR spectroscopy, the differences in the structure of the amorphous and crystalline phases in pure poly(ethylene oxide) and its complexes with p‐dichlorobenzene or p‐nitrophenol were characterized. Prounounced differences also in the dynamic structure of the crystalline phase in these systems are indicated by the relaxation times T 1 (C), T 1ρ (C) and T 1ρ (H).