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Showing 1 to 13 of 13 for “"Polymeric foams"”.
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Bubble dynamics in polymeric foams
… on the expansion of gas bubbles in polymer foams for both non-reactive and reactive polymers are investigated. Polymer foams are used extensively in consumer products, from car parts to upholstery. They are produced either by injection moulding (of non-reactive polymeric fluids) or reaction …
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Multifunctional polymeric foams: preparation, characterization, and environmental aspects
Syntactic foams (SFs) are characterized by a unique combination of low density, high mechanical properties, and low thermal conductivity. Moreover, these properties can be tuned to specific applications. In contrast to traditional foams, where porosity is formed during the foaming process, porosity …
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Benign Processing of High Performance Polymeric Foams of Poly(arylene ether sulfone)
… with the production of high performance polymer foams via a benign foaming process. The first goal of this project was to develop a process and the conditions necessary to produce a low density (>80% density reduction) foam from poly(arylene ether sulfone) (PAES). Water and supercritical carbon …
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Optimal Blast-Resistant Sandwich Structures with Transversely Isotropic, Elasto-plastic Polymeric Foams as Cores
Polymeric foam cores are widely used as core materials in sandwich panels subject to blast loads, where high strain rates of the order of 4000 /s are observed. Unlike metallic foams polymeric foams exhibit transversely isotropic response when tested in a laboratory setting. More specifically, they …
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Foam formation in a PMMA-methanol system
… the generation of low density and low cell size polymeric foams. Specifically, this means to understand what parameters contribute to an increase in nucleation density and a decrease in cell size. Polymeric foams with low cell size and density serve a lot of different applications such as …
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Gas loss and durability of EVA foams used in running shoes
… the thermal properties and creep response of polymericfoams. This research analyses the effects of gas diffusion on the mechanical responseof polymeric foams subjected to periodic loads and studies their durability.A repeat impact machine was developed to analyse changes in the mechanical …
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Computational analysis of non-isothermal flow of non-Newtonian fluids
… (e.g. worm-like micellar solutions and some polymeric fluids) exhibit flow instabilities such as the emergence of regions of different shear rates (shear bands) within the flow field. It has also been observed that the reacting mixture in reaction injection molding of polymeric foams …
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Cure characterization and process modeling of soy-based composites
… soy-based composites, and analysis of flexible polymeric foams. In the first part of this work, the cure kinetics and rheology of the soy-based resin system were studied. The cure kinetics models of the different resin formulations were developed. A neural network based model was developed to …
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The elastic and plastic behaviour of cellular materials
… and bone, occur in nature, while others, like polymeric foams, are manmade. Because of their cellular structure, they have unusual mechanical properties: they can be stiff, yet light, and they are capable of absorbing large deflections and thus large amounts of energy. Yet their mechanical …
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Deformation and fracture of PMMA with application to nanofoaming and adhesive joints
… predictions may contribute to the development of polymeric foams with a thermal conductivity close to that of air. The second part of the thesis explores the fracture behaviour of structural adhesive (e.g. MMA)-based joints. An adhesive layer within such a joint is prone to defects such as …
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Alternative Foam Treatments For The Space Shuttle's External Tank
… be accomplished. Then significant research on polymeric foams and ablative materials will be completed to learn how these various products can be applied in this industry. With this research and analysis, the knowledge gained will be used to select and evaluate the effectiveness of an alternate …
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The development of h Homogeneous nucleation rate model for thermoplastic foams based on a molecular partition function and Fickian diffusion
… nucleation rate model for thermoplastic foams has been developed. This model does not rely on experimentally determined parameters and only uses pure component physical property data and a binary diffusion coefficient. This model, like those derived from classical nucleation theory, is …
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Thermally/Mechanically Responsive Polymeric Composites with Shape Memory/Self-Healing Properties
… novel thermally and mechanically responsive polymeric composites for several industrial applications.</p> <p>In Chapter 2, the curing kinetics and polymerization induced phase separation (PIPS) of an epoxy matrix with and without a semicrystalline thermoplastic was investigated. Same PIPS …