Elsevier

Polymer

Volume 33, Issue 4, 1992, Pages 712-717
Polymer

Polymer paper
High-resolution solid-state 13C nuclear magnetic resonance study on poly(vinyl alcohol)/poly(vinylpyrrolidone) blends

https://doi.org/10.1016/0032-3861(92)90326-RGet rights and content

Abstract

The miscibility and domain structure of poly(vinyl alcohol)/poly(vinylpyrrolidone) (PVA/PVP) blends are investigated by high-resolution solid-state 13C nuclear magnetic resonance methods. The observed 13C spectra and the intermolecular cross-polarization of the blends suggest a hydrogen-bonding interaction between the two polymers. 1H T1 and T1ϱ results indicate that the blends are miscible at all compositions on a scale of 200–300 Å. On a scale of 20–30 Å, however, the miscibility of the blends depends significantly on the composition. When the PVA composition is more than 46 wt%, the blends are composed of two phases, an amorphous miscible phase of PVP plus PVA and a pure PVA phase. The crystallinity of the PVA phase decreases rapidly with decreasing PVA composition. When the PVA composition is less than 46 wt%, the blend is completely miscible. The composition of PVA phase in the blends was inferred from the results of 1H T1ϱ.

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    On leave from Analytical Center, East China Normal University, Shanghai, PR China

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