Dynamic mechanical relaxations of poly(vinylidene fluoride)-poly(vinylpyrrolidone) blends

Dynamic mechanical measurements on blends of poly(vinylidene fluoride) (PVDF) and poly(vinylpyrrolidone) (PVP) over the whole composition range are reported from −150 to 220°C. The results provide evidence of miscibility of PVDF with PVP. Two ranges of compositions are identified. When the PVP conte...

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Bibliographic Details
Published in:Polymer (Guilford) 1989-07, Vol.30 (7), p.1251-1256
Main Authors: Ceccorulli, Giuseppina, Pizzoli, Maria, Scandola, Mariastella, Alfonso, Giovanni Carlo, Turturro, Antonio
Format: Article
Language:English
Subjects:
Applied sciences
dynamic mechanical relaxations
Exact sciences and technology
Mechanical properties
Organic polymers
Physicochemistry of polymers
poly(vinylidene fluoride)
poly(vinylpyrrolidone)
polymer blends
Properties and characterization
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Summary:Dynamic mechanical measurements on blends of poly(vinylidene fluoride) (PVDF) and poly(vinylpyrrolidone) (PVP) over the whole composition range are reported from −150 to 220°C. The results provide evidence of miscibility of PVDF with PVP. Two ranges of compositions are identified. When the PVP content is higher than 40%, crystallization of PVDF is inhibited and single-phase, homogeneous mixtures are obtained. At lower PVP concentrations, three phases coexist: a homogeneous blend of quasi-constant composition, crystalline PVDF and a pure amorphous PVDF phase, the so-called ‘interphase’ evidenced by a relaxation at about −40°C. For the partially crystalline blends, the viscoelastic spectrum is shown to depend strongly on thermal history.
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(89)90044-X