NDLI: Stress relaxation as a microstructural probe for immiscible polymer blends

Content Provider	Springer Nature Link
Author	Vinckier, Inge Mewis, Jan Moldenaers, Paula
Copyright Year	1997
Abstract	Relaxation has been investigated in immiscible blends that consist of slightly viscoelastic components. Both the shear and normal stresses have been measured after cessation of steady shear flow as well as after transient shear histories. The latter can generate a fibrillar structure which can relax by either retraction or break-up via end-pinching or Rayleigh instabilities. Each of these three relaxation mechanisms is reflected in the shape of the stress curves, from which also the corresponding structural time scales can be deduced. The experimental results have been used to evaluate the Doi-Ohta and Lee-Park models for immiscible blends. The scaling relations by Doi-Ohta are confirmed by the experimental results, but none of the existing models can correctly predict the complex relaxation behaviour observed for a highly deformed droplet phase. In the present study an alternative approach has been proposed. The stress relaxation due to fibril break-up via Rayleigh instabilities has been predicted successfully by combining physical models for the structural changes with the basic approach of the Doi-Ohta model.
Starting Page	513
Ending Page	523
Page Count	11
File Format	PDF
ISSN	00354511
Journal	Rheologica Acta
Volume Number	36
Issue Number	5
e-ISSN	14351528
Language	English
Publisher	Steinkopff-Verlag
Publisher Date	1997-01-01
Publisher Place	Darmstadt
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Immiscible blends stress relaxation Rayleigh instabilities blend morphology Polymer Sciences Condensed Matter and Material Sciences Materials Processing, Characterization, and Design
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Materials Science

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