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NMR study of poly(vinylpyrrolidone)/poly(ethylene oxide) blends
Author(s) -
Diniz Teresinha M. F. F.,
Tavares Maria I. B.
Publication year - 2002
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.10835
Subject(s) - materials science , ethylene oxide , microstructure , polymer , amorphous solid , polymer chemistry , tacticity , solid state nuclear magnetic resonance , magic angle spinning , chemical engineering , polymer blend , miscibility , oxide , intermolecular force , nuclear magnetic resonance spectroscopy , copolymer , molecule , organic chemistry , composite material , chemistry , nuclear magnetic resonance , physics , engineering , polymerization , metallurgy
Development of polymeric blends has become very important for polymer industries because they have been shown to be successful and versatile alternatives to obtain new polymers. In this work binary blends formed by poly(vinylpyrrolidone) (PVP) and poly(ethylene oxide) (PEO) were studied by solution and solid‐state NMR to determine their physical interaction, homogeneity, and compatibility for use as membranes to separate water/alcohol. The NMR results allowed us to acquire information on the microstructure and molecular dynamic behavior of polymer blends. From the NMR solution it was possible to evaluate the microstructure: PVP presented a preferential syndiotactic distribution sequence and PEO presented two regions, one crystalline and the other amorphous. Considering the solid‐state NMR results it was possible to evaluate the molecular dynamics and all binary blends, showing that PEO behaves as a plasticizer; some intermolecular interaction was also observed. An important point was to evaluate the microstructure of the carbonyl PVP using cross polarization/magic‐angle spinning (CP/MAS) and CP/MAS/dipolar decoupling that was not observed before. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 2820–2823, 2002