1. A modified rheometer for in-situ radial and tangential SAXS studies on shear-induced alignment
- Author
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Gert O. R. Alberda van Ekenstein, Evgeny Polushkin, Olli Ikkala, Gerrit ten Brinke, Polymer Chemistry and Bioengineering, and Zernike Institute for Advanced Materials
- Subjects
DYNAMICS ,Materials science ,Rheometer ,gap-dependent behavior ,FLOW ,STYRENE-ISOPRENE-STYRENE ,ANGLE NEUTRON-SCATTERING ,Shear modulus ,Optics ,Rheology ,BLOCK-COPOLYMER ,General Materials Science ,Composite material ,in-situ two-directional rheo-optic measurements ,Complex fluid ,Small-angle X-ray scattering ,business.industry ,Scattering ,tooth rheometer ,Condensed Matter Physics ,X-RAY-SCATTERING ,LAMELLAR DIBLOCK COPOLYMER ,Amplitude ,Shear (geology) ,ENTANGLED POLYMERS ,WALL SLIP ,ORIENTATION ,business - Abstract
A tooth rheometer designed to investigate the influence of large amplitude oscillatory shear on the macroscopic orientation of complex fluids is described. The rheometer allows in-situ two-directional small-angle scattering measurements, making it possible to observe in particular the orientation process of hierarchically structured block copolymers in dynamics. Experiments performed with a linear poly(vinyl methyl ether) show that, despite a considerable gap/width ratio, the rheometer can be used for adequate rheological measurements. In addition we found an unexpected dependence of the dynamic parameters on the rheometer gap. The small amount of sample required favors the use of this rheometer for measuring the rheological characteristics of new compounds.
- Published
- 2004