نتایج جستجو برای: rheometry

تعداد نتایج: 530  

2009
Gregorio M. Vélez-García Kevin Ortman Aaron P.R. Eberle Peter Wapperom Donald G. Baird

This paper presents a 2D coupled Hele-Shaw flow approximation for predicting the flow-induced orientation of injection molded composite parts within a commercial concentration range. For a highly concentrated short glass fiber PBT suspension, the impact of inter-particle interactions and the orientation at the gate is investigated for a center-gated disk using a time-delayed orientation evoluti...

1996
E. Bakke W. L. Johnson W. M. Keck

The viscosity of the Zr46.75Ti8.25Cu7.5Ni10Be27.5 bulk metallic glass forming alloy in the supercooled liquid was measured using parallel plate rheometry. The measurements were carried out with different heating rates between 0.0167 and 1.167 K/s as well as isothermally. Because of the high thermal stability above the glass transition of this bulk metallic glass former with respect to crystalli...

Journal: :Soft matter 2015
Nick Koumakis Esmaeel Moghimi Rut Besseling Wilson C K Poon John F Brady George Petekidis

Using a powerful combination of experiments and simulations we demonstrate how the microstructure and its time evolution are linked with mechanical properties in a frustrated, out-of-equilibrium, particle gel under shear. An intermediate volume fraction colloid-polymer gel is used as a model system, allowing quantification of the interplay between interparticle attractions and shear forces. Rhe...

2015
Hesam Taheri Dirk Stanssens Pieter Samyn

Organic nanoparticles of poly(styrene-co-maleimide) or SMI were synthesized in aqueous dispersion with a maximum concentration of 35 wt.% and are favorably applied in industrial coating processes. In order to evaluate the further processability and flow behavior of these nanoparticle dispersions, general rheological characterization under creep, oscillatory and rotational testing was done by ap...

2013
Zhiqi Cai Shuang Mei Yuan Lu Yuanqi He Pihui Pi Jiang Cheng Yu Qian Xiufang Wen

In order to improve the thermal properties of important engineering plastics, a novel kind of liquid crystalline epoxy resin (LCER), 3,3',5,5' -Tetramethylbiphenyl-4,4' -diyl bis(4-(oxiran-2-ylmethoxy)benzoate) (M1) was introduced to blend with nylon 66 (M2) at high temperature. The effects of M1 on chemical modification and crystallite morphology of M2 were investigated by rheometry, thermo gr...

Journal: :Journal of physics. Condensed matter : an Institute of Physics journal 2015
F Snijkers R Pasquino P D Olmsted D Vlassopoulos

We briefly review the recent advances in the rheology of entangled polymers and identify emerging research trends and outstanding challenges, especially with respect to branched polymers. Emphasis is placed on the role of well-characterized model systems, as well as the synergy of synthesis-characterization, rheometry and modeling/simulations. The theoretical framework for understanding the obs...

Journal: :Soft matter 2014
A Kate Gurnon Carlos R Lopez-Barron Aaron P R Eberle Lionel Porcar Norman J Wagner

The complex, nonlinear flow behavior of soft materials transcends industrial applications, smart material design and non-equilibrium thermodynamics. A long-standing, fundamental challenge in soft-matter science is establishing a quantitative connection between the deformation field, local microstructure and macroscopic dynamic flow properties i.e., the rheology. Here, a new experimental method ...

2007
Guoli Lai Zongliang Du Guoying Li

Blends of collagen dispersion (COL) with poly(vinyl alcohol) (PVA) in different weight ratios were investigated by oscillatory rheometry, Fourier transform-infrared spectroscopy and scanning electron microscopy. It was found that even with 80% of PVA, the COL/PVA blends behaved more like collagen dispersion than pure PVA solution in the dynamic thermal and frequency processing, for instance, a ...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2007
A Ragouilliaux G Ovarlez N Shahidzadeh-Bonn Benjamin Herzhaft T Palermo P Coussot

From magnetic resonance imaging rheometry we show that a pure emulsion can be turned from a simple yield stress fluid to a thixotropic material by adding a small fraction of colloidal particles. The two fluids have the same behavior in the liquid regime but the loaded emulsion exhibits a critical shear rate below which no steady flows can be observed. For a stress below the yield stress, the pu...

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