Applied Rheology: Publications

Appl Rheol online available publications for selected issue

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Delegates of the national rheological societies
Society's Site Sep 2006 - Feb 2007

Appl. Rheol. 16:4 (2006) 220-229

Cite this publication as follows:
Rheological Societies: Society's Site Sep 2006 - Feb 2007, Appl. Rheol. 16 (2006) 220.

Martin Kroger, Peter Fischer
Patents Review (Aug 2006)

Appl. Rheol. 16:4 (2006) 214-215

Cite this publication as follows:
Kroger M, Fischer P: Patents Review (Aug 2006), Appl. Rheol. 16 (2006) 214.

Hellenic Society of Rheology
3rd Annual European Rheology Conference (AERC 2006)

Appl. Rheol. 16:4 (2006) 210-211

Cite this publication as follows:
Hellenic_Society_of_Rheology: 3rd Annual European Rheology Conference (AERC 2006), Appl. Rheol. 16 (2006) 210.

Daniel T. Fisher, David V. Boger, Peter J. Scales
Measurement errors in yield stress rheometry that arise from torque auto zero

Appl. Rheol. 16:4 (2006) 206-209

The measurement of the shear rheology of concentrated particulate suspensions is important to a range of mixing, pumping and flow operations. The use of a four or six bladed vane attached to a rheometer in an open cup is a popular technique to achieve a rheological characterisation. A problem occurs in the use of automated software with a number of rheological devices for yield stress materials. A torque auto zero default causes the torque at the start of a test to be ignored, and can result in significant errors and underestimation of the yield stress or rheological response of the suspension. The potential effect of using a torque auto zero default is demonstrated for a concentrated particulate suspension of nickel laterite.

Cite this publication as follows:
Fisher DT, Boger DV, Scales PJ: Measurement errors in yield stress rheometry that arise from torque auto zero, Appl. Rheol. 16 (2006) 206.

Patrick D. Anderson, Joseph Dooley, Han E.H. Meijer
Viscoelastic effects in multilayer polymer extrusion

Appl. Rheol. 16:4 (2006) 198-205

The effect of viscoelasticity on multilayer polymer extrusion is discussed. In these coextrusion processes predetermined patterns are created with a remarkable breadth of complexity even in geometrically simple dies via elastic rearrangements caused by the second-normal stress differences. A computational method is offered, based on the mapping method, which quantitatively describes the flow-induced patterns. Besides that the results are esthetically beautiful, they are also relevant for practice, since process and die design optimization is now possible. Not only to minimize interface distortion, but potentially also to deliberately create new processes and products based on this flow-induced patterning of polymers.

Cite this publication as follows:
Anderson PD, Dooley J, Meijer HEH: Viscoelastic effects in multilayer polymer extrusion, Appl. Rheol. 16 (2006) 198.

Luigi Coppola, Domenico Gabriele, Isabella Nicotera, Cesare Oliviero
MRI Experiments as a Tool to Study Asymptotic-Shear Flow Behaviour of a Worm-Like Reverse Micellar Phase

Appl. Rheol. 16:4 (2006) 190-197

This paper deals with a Magnetic Resonance micro-Imaging (MRI) analysis of asymptotic kinematics which is a condition adopted in some rheological characterisations. Asymptotic kinematics (for example the slow shearing ) aim is to evaluate material properties at ''equilibrium'', avoiding structural changes induced by external stimuli. Measured material functions in these mechanical conditions deal with the structure/morphology of materials and can be used to investigate the structure as a function of the state variables only, as temperature, pressure and composition. In this paper MRI experiments were performed to study some shear flow behaviours of surfactant wormy micelles made by lecithin/water and diluted in cyclohexane (reverse micellar phase L2). MRI was used as a non-invasive tool in order to follow the structural responses both during slow shearing and when the sample is stirred outside the linear behaviour range. Relations can be found between the typical NMR parameters, strictly related to the microstructure, and the rheological macroscopic parameters as zero-shear viscosity.

Cite this publication as follows:
Coppola L, Gabriele D, Nicotera I, Oliviero C: MRI Experiments as a Tool to Study Asymptotic-Shear Flow Behaviour of a Worm-Like Reverse Micellar Phase, Appl. Rheol. 16 (2006) 190.

Nilobon Phewthongin, Pongdhorn Saeoui, Chakrit Sirisinha
Comparison of Viscoelastic Behaviour in Silica Filled Cured and Uncured cpe/nr Blends with Various Mixing Time

Appl. Rheol. 16:4 (2006) 182-189

Blends of 30-phr silica filled elastomeric chlorinated polyethylene (CPE) and natural rubber (NR) at the blend composition ratio of 80/20 CPE/NR were prepared with various mixing time from 120 to 600 s. Viscoelastic behaviours of cured and uncured blends were determined using two rheometers with different shear modes, i.e., the oscillatory rheometer (Rubber Process Analyser, RPA2000) and the rate-controlled capillary rheometer (Goettfert Rheotester 2000). Results obtained reveal that the viscoelastic behaviour of blends is influenced by the formation of silica transient network, particularly in cured blends. Mixing time affects viscoelastic properties of vulcanised blends to some extent which is due probably to the high extent of thermal degradation, but plays no significant role in viscoelastic properties of unvulcanised blends. The superimposition of oscillatory and steady shear results is possible when the elastic component is eliminated from the results.

Cite this publication as follows:
Phewthongin N, Saeoui P, Sirisinha C: Comparison of Viscoelastic Behaviour in Silica Filled Cured and Uncured cpe/nr Blends with Various Mixing Time, Appl. Rheol. 16 (2006) 182.

Peter Fischer
Rheometry of Pastes, Suspensions and Granular Materials - Application in Industry and Environment (P. Coussot)

Appl. Rheol. 16:4 (2006) 181

Cite this publication as follows:
Fischer P: Rheometry of Pastes, Suspensions and Granular Materials - Application in Industry and Environment (P. Coussot), Appl. Rheol. 16 (2006) 181.


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