Molecular orientation and optical anisotropy induced by the stretching of poly(vinyl alcohol)poly(N-vinyl pyrrolidone) blends
β Scribed by Yoshiyuki Nishio; Hidematsu Suzuki; Kazuyuki Sato
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 947 KB
- Volume
- 35
- Category
- Article
- ISSN
- 0032-3861
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## Abstract Dense membranes made of poly(vinyl alcohol) (PVA) and poly(__N__βvinylβ2βpyrrolidone) (PVP) blends of different compositions were studied in gasβsweeping permeation of a waterβethanol mixture containing 10 wt.β% of water. When the PVP content increases, the steadyβstate permeation flux
Fluorescence optical microscopy (FOM) of poly(vinyl alcohol) (PVA) and poly(vinyl acetate) (PVAc) blends in compositions 9/1, 1/1, and 1/9 (w/w) show that these blends present phase separation in the solid state. Each domain of the solid samples was identified by FOM as PVA-richer domains by green f
Blends of poly(vinyl chloride) (PVC) with Poly(N-vinyl pyrrolidone) (PVP) were investigated by Fourier infrared spectroscopy (FTIR) and high-resolution solidstate 13 C cross-polarization/magic angle spinning (CP/MAS) nuclear magnetic resonance (NMR) spectroscopy. The intermolecular interactions betw