NDLI: Evolution of viscosities and morphology for the two-phase system polyethylene oxide/poly(dimethylsiloxane)

Content Provider	Springer Nature Link
Author	Schnell, Matthias Ziegler, Verena Wolf, Bernhard A.
Copyright Year	2007
Abstract	Shear viscosities and oscillatory viscosities were measured for the two-phase system polyethylene oxide/poly(dimethylsiloxane) at 70 °C as a function of composition. This blend exhibits the usual droplet/matrix structures in the vicinity of the pure components and a region of co-continuity within which two droplet/matrix structures coexist. A stepwise reduction in the shear rate, $${\mathop \gamma \limits^ \cdot }$$ , leads to a rapid increase in viscosity followed by a much slower exponential decay; plots of the corresponding rate constants as a function of composition exhibit two discontinuities marking the boundaries of co-continuity; a similar dependence is obtained for the time independent final viscosities $$\eta ^{\infty } $$ . Keeping the blend composition constant and determining $$\eta ^{\infty } $$ as a function of $${\mathop \gamma \limits^ \cdot }$$ yields a curve that passes a distinct maximum, where the viscosities are very close to that of the less viscous pure component on both ends of this dependence. The dynamic mechanical measurements of the blends yield at low frequencies storage moduli G′ that are orders of magnitude larger than that of the components because of the deformation of the interfaces. At high frequencies, the loss moduli G″ reflect the increasing alignment of the drops suspended in the matrix phases. The composition dependencies of G′ and of the complex viscosities can again be used to determine the limits of co-continuity.
Starting Page	469
Ending Page	476
Page Count	8
File Format	PDF
ISSN	00354511
Journal	Rheologica Acta
Volume Number	47
Issue Number	4
e-ISSN	14351528
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-12-03
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polymer blends Two-phase morphology Co-continuity Shear viscosity Storage modulus Loss modulus Food Science Soft Matter, Complex Fluids Mechanical Engineering Polymer Sciences Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Materials Science

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