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Home  >  Journal list  >  Polymer Journal  >  Vol.13  No.3 (1981)  >  pp.273-281

Polymer Journal
<<Previous article Vol.13  No.3 (1981)   pp.273 - 281 Next article>>

Phase Separation and Viscoelastic Behavior of Semicompatible Polymer Blends: Poly(vinylidene fluoride)/Poly(methyl methacrylate) System

Yasushi Hirata1) and Tadao Kotaka1)
1) Department of Macromolecular Science, Osaka University

ABSTRACT:  Thermal and dynamic mechanical analyses of variously processed blends of poly(vinylidene fluoride) (PVF2) and poly(methyl methacrylate) (PMMA) were carried out to elucidate the effects of lower-critical-solution-temperature (LCST) behavior reported earlier by Paul on the morphologies and properties of this system. The two components are miscible in the blends with PVF2 content φw<0.6. Such blends exhibit single glass transition at Tg’s, which follow the Gordon-Taylor scheme. On the other hand, the blends with φw>0.6, prepared by melt-mixing and annealing at 200°C for a sufficiently long period of time, exhibit two Tg’s and two Tm’s, implying a four-phase morphology. In such blends an LCST-type phase separation has taken place at a temperature as low as 200°C to give an amorphous mixture with φw≅0.6 and a nearly pure PVF2 melt. Quenching of such melts leads to a four-phase morphology composed of a mixed amorphous phase with Tg≅55°C, an imperfect crystalline phase grown out from the mixture and hence having a low Tm, and a nearly pure semicrystalline PVF2 domains similar to form II crystals with Tg≅−40°C and a higher Tm.


Keyword:
Amorphous Polymer–Crystalline Polymer Blends/ Semicompatible Polymer Blend/ Poly(vinylidene fluoride)/ Poly(methyl methacrylate)/ Phase Separation/ Differential Scanning Calorimetry/ Viscoelastic Properties/ Melt-Mixed Blend/ Solution-Mixed Blend

Published online: March 03, 2006
© Copyright, 2006 by The Society of Polymer Science, Japan

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