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A Viscometric Study of the Miscibility Behaviour of Poly(N-Vinyl Pyrrolidone) Blends

✍ Scribed by Danait, Achala; Deshpande, Dinkar D.

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
353 KB
Volume
42
Category
Article
ISSN
0959-8103

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✦ Synopsis

The miscibility behaviour of blends of poly(N-vinyl pyrrolidone) (PVP) with poly(vinyl chloride) (PVC), poly(vinyl acetate) (PVAc) and vinyl chlorideÈ vinyl acetate (VCVAc) copolymer has been investigated on the basis of a viscometric approach. PVP is found to be miscible with PVC over the entire composition range, as is evident from the high values observed for the intrinsic viscosity of transfer. This is further supported by the single glass transition temperature observed in di †erential scanning calorimetry studies of the blend Ðlms. Blends of PVP with VCVAc copolymer exhibit microphase separation which is shown clearly in the scanning electron micrographs of the Ðlms. PVAc/PVP blends show interaction only at low PVAc contents, but in general are immiscible.

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