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Miscibility of an oligo( p ‐phenylenevinylene) with polystyrene studied by solid‐state nuclear magnetic resonance
Author(s) -
Nouwen Johan,
Adriaensens Peter,
Gelan Jan,
Verreyt Gunther,
Yang Zhou,
Geise Herman J.
Publication year - 1994
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1994.021950715
Subject(s) - polystyrene , miscibility , chemistry , analytical chemistry (journal) , oligomer , magic angle spinning , benzene , polymer , polymer chemistry , nuclear magnetic resonance spectroscopy , organic chemistry
Molecular proximity of cis/trans mixtures of 2,5‐dimethoxy‐1,4‐bis[2‐(3,4,5‐trimethoxyphenyl)vinyl]benzene (MPV, 1 ) and polystyrene (PS) in mixtures of different MPV/PS weight ratios up to 60/40 is shown by 1 H combined rotation and multiple pulse spectroscopy (CRAMPS) using 2D exchange experiments. The MPV/PS mixtures up to a weight ratio 60/40 are homogeneous, whereas the mixture with a weight ratio MPV/PS = 80/20 is heterogeneous. The comparison of the cross polarization/magic angle spinning (CP/MAS) 13 C NMR spectra of pure MPV and of MPV mixed with PS shows significant linebroadening in case of intimate mixing, while the heterogeneous mixture shows some extra finestructure. The miscibility results were confirmed by proton spin‐locking relaxation time measurements ( T 1ρ H) on the mixtures. On intimate mixing, T 1ρ H is averaged out and varies linearly as a function of the composition of the mixture. CRAMPS‐spectra and T 1ρ H measurements show that iodine‐doped MPV/PS mixtures (weight ratios 40/60 and 60/40) are heterogeneous. Furthermore, doping causes a slight proton chemical shift change and reduces the T 1ρ H‐values of those oligomer‐polymer systems.