Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 11 of 11 for “"Polymer Rheology"”.
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Fluctuation theorems and work relations for single polymer rheology
"Synthetic and biological polymeric materials are ubiquitous in nature and modern technology. The emergent properties afforded by these materials allows for wide a array of applications as found in adhesives, coatings, and synthetic polymers for plastics. Importantly, the molecular properties of …
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Thermal homogeneity and energy efficiency in single screw extrusion of polymers. The use of in-process metrology to quantify the effects of process conditions, polymer rheology, screw geometry and extruder scale on melt temperature and specific energy consumption
Polymer extrusion is an energy intensive process whereby the simultaneous action of viscous shear and thermal conduction are used to convert solid polymer to a melt which can be formed into a shape. To optimise efficiency, a homogeneous melt is required with minimum consumption of process energy. …
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Numerical investigation of polymer injection effects on geomechanical reservoir properties during enhanced oil recovery
Polymer injection is an enhanced oil recovery method based on the viscosity increase of the injected aqueous phase to control its mobility. The changes in mobility could affect the pore pressure distribution within the reservoir. The objective of this research work is investigating the effects of …
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Formation of microfibers and nanofibers by capillary-driven thinning of drying viscoelastic filaments
… to draw controlled networks of very uniform polymeric microfibers and nanofibers by exploiting elasto-capillary thinning and stretching of macroscopic liquid bridges (Harfenist et al., Nano Lett., 4(10),2004). We develop a model of this process that describes the simultaneous …
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A study of the extrusion of particulate cellulosic composite materials
… the process. Recourse to the literature of polymer rheology, fluid mechanics, and soil mechanics gave the basis for a crude mechanism hypothesis, and iterative improvements in the instrumental techniques yielded data with which this could be refined. Although some correlation between the …
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Nonlinear rheology of micelles and polymers
This thesis is concerned with the theory of polymer rheology. 'Living polymers' are chain-like structures which closely resemble ordinary polymers, except that they can break and reform reversibly. The best-studied examples are wormlike surfactant micelles. A model for these systems has recently …
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Viscoelastic and nanomechanical behaviors of polymeric materials
The mechanical and viscoelastic properties of polymers at different length scales (from nanometers to bulk) have attracted great attention. One method recently widely used to characterize the nanomechanical properties of materials is nanoindentation technique. For nanoindentation of polymers, in …
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Exponential Stability for a Diffusion Equation in Polymer Kinetic Theory
… equation arising from dumbbell models for polymer flow. Using the methods of semigroup theory, we show that the semigroup U(t) associated with the diffusion equation is well defined and that all solutions converge exponentially to an equilibrium solution. Both finitely and infinitely …
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Low cost reactors for redox-active polymer flow batteries
… (IEMs) to achieve long lifetimes. Redox-active polymer (RAP) solutions show great promise as candidate electrolytes to mitigate crossover through size-exclusion, enabling the use of relatively inexpensive porous separators in place of IEMs. This study holistically evaluates poly(vinylbenzyl …
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Rheology of Foaming Polymers and its Influence on Microcellular Processing
The rheological properties of polymer melts and polymer/blowing agent (BA) solutions are determined experimentally and the influences of material rheological properties and crystallization on low-density foaming behaviour of polylactic acid (PLA) are investigated. Understanding the rheological …
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Linking the Rheological Behavior to the Processing of Thermotropic Liquid Crystalline Polymers in the Super-cooled State
Thermotropic liquid crystalline polymers (TLCPs) have attracted great interest because of the combination of their promising properties, which includes high stiffness and strength, excellent processability, and outstanding chemical resistance. TLCPs exhibit inherently low viscosity relative to many …