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|Title: ||MISCIBILITY OF AN OLIGO(P-PHENYLENEVINYLENE) WITH POLYSTYRENE STUDIED BY SOLID-STATE NUCLEAR-MAGNETIC-RESONANCE|
|Authors: ||NOUWEN, J|
|Issue Date: ||1994|
|Publisher: ||HUTHIG & WEPF VERLAG|
|Citation: ||MACROMOLECULAR CHEMISTRY AND PHYSICS, 195(7). p. 2469-2476|
|Abstract: ||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 H-1 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) C-13 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(1rho)H) on the mixtures. On intimate mixing, T(1rho)H is averaged out and varies linearly as a function of the composition of the mixture. CRAMPS-spectra and T(1rho)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(1rho)H-values of those oligomer-polymer systems.|
|Notes: ||UNIV INSTELLING ANTWERP,DEPT CHEM,B-2610 WILRIJK,BELGIUM.NOUWEN, J, UNIV LIMBURG,INST MAT RES,DIV CHEM,UNIV CAMPUS,B-3590 DIEPENBEEK,BELGIUM.|
|ISI #: ||A1994NW82200015|
|Type: ||Journal Contribution|
|Appears in Collections: ||Research publications|
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