Extensional Rheology in Polymer Processing Extensional flows dominate many polymer processes, including blow molding, film blowing, fiber spinning, thermoforming and many others. The rheology of polymeric materials under extensional flows can differ significantly from shear flows and it is important to understand this in order to optimize both materials and processes. In this webinar, we…
DetailsOVERVIEW Large amplitude oscillatory shear (LAOS) is used increasingly as a tool to measure the nonlinear viscoelastic responses of soft solids and complex fluids. For many material systems the common practice of reporting only “viscoelastic moduli” (typically corresponding to the first harmonic Fourier coefficients G’1(w), G”1(w)) is insufficient and/or misleading in describing the nonlinear phenomena.…
DetailsGerald Fuller – Interfacial Rheology OVERVIEW Interfacial rheology dominates the behavior of many complex fluid systems. Whether the system is characterized by a fluid-fluid interface or fluid-air interface, these characteristics influence the behavior of biological systems, oil recovery, personal care products, food and more. Learn about the basic forces that drive interfacial dynamics and stability,…
DetailsSummary Research rheometers present excellent platforms for the characterisation and quantification of powder flowability. Until recent years, powder characterisations have been restricted only to instruments dedicated to just that one class of materials. Now there is a growing recognition of the opportunities for extending the application of high-performance rheometers to the measurement of particulate solids.…
DetailsInterfacial Rheology: Fundamental Overview and Applications Overview Interfacial rheology dominates the behavior of many complex fluid systems. Whether the system is characterized by a fluid-fluid interface or fluid-air interface, these characteristics influence the behavior of biological systems, oil recovery, personal care products, food and more. Learn the basic forces that drive interfacial dynamics and…
DetailsJan Vermant – Orthogonal Superposition Rheology OVERVIEW Superposition flows in rheology are powerful methods to understand non-linear and anisotropic viscoelasticity. Parallel Superposition experiments have been historically simple to perform, but are difficult to understand and do not provide all of the desired information. Recent developments have made Orthogonal Superposition more simple to perform, allowing…
DetailsOverview Maintaining the optimum viscosity of a molten material is key for efficiency and product quality of many industrial processes. Processing of melts at high temperatures is the basis for classical or additive manufacturing of many materials like glasses or metals. Molten slag or ash viscosity is essential for economically operating industrial gasification processes…
DetailsNeil Cunningham: Essential tools for the new Rheologist. What is rheology and how can you use it to practically describe the flow and deformation of structured fluids and soft solids? Neil Cunningham will provide an accessible introduction to key rheological behaviours that will enhance your tool kit for understanding these important product characteristics. He will answer…
DetailsNorman J. Wagner: An Introduction to Colloidal Suspension Rheology Colloidal suspensions are encountered across a broad range of natural phenomena and industrially relevant products and processes. From coatings and inks, to foods and pharmaceuticals, dispersions, sols, gels, and glasses of colloidal particles exhibit a rich rheological behavior. This webinar will present an introductory overview of…
DetailsProfessor Chris Macosko – Analyzing Molecular Weight Distribution w/ Rheology In this TA Instruments Webinar, Professor Chris Macosko discusses analyzing molecular weight distribution and blend morphology using rheology. Rheology is a powerful tool for analyzing polymer blends. This seminar will begin with the simplest case: molten blends of two different molecular weight homopolymers.We will…
DetailsThe Role of Interfacial Elasticity on the Rheological Behavior of Polymer Blends: João Maia, Ph.D. The Role of Interfacial Elasticity on the Rheological Behavior of Polymer Blends Polymer blends are commonly used to generate materials with a desired combination of performance properties and cost. Most polymer blends are compatibilized to promote stability of the otherwise immiscible…
DetailsRandy H. Ewoldt: Experimental Challenges of Shear Rheology, How to Avoid Bad Data How do you know when to trust your rheology data? How do you avoid bad data? Is there a checklist? Can you co-plot quantitative experimental boundaries against measured data? This presentation will discuss techniques for identifying and minimizing experimental errors and for…
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