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 15 of 15 for “"Aging Behavior"”.
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A study of Asphalt Aging Behavior Using Molecular Dynamics Simulations
Oxidative aging is a major issue in asphalt pavements that leads to hardening of the asphalt, which further contributes significantly to asphalt pavement embrittlement and eventually results in excessive pavement cracking. In addition, the performance of asphalt binder is also highly related to its …
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The effects of molecular orientation on the physical aging behavior of oriented glassy amorphous polymers
… has an effect on the rate of physical aging in amorphous glassy polymers. There is already a large body of literature concerning the phenomenon of physical aging, although the vast majority has been directed toward isotropic, unoriented systems. The importance of this study is therefore …
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Nonequilibrium behavior of polymeric network glasses
This study of nonequilibrium behavior in-network and pseudo network polymeric glasses has focused on linear and network epoxy systems, semicrystalline PET, and SBS and PC-PSX block copolymers. The aging behavior of polymers within each of these three classes was compared, and certain relationships …
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Physical Aging of Miscible Polymer Blends
Physical aging measurements were performed on various polymeric glasses with the overriding goal of developing a better molecular picture of the nonequilibrium glassy state. To this end, aging-induced changes in mechanical properties and in the thermodynamic state (volume and enthalpy) were …
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Insulation considerations and qualifications for form-wound air-core armature windings in high-frequency electrical machines
… and begin an exploration of accelerated aging behavior in the author's absence. Appendices provide a step-by-step guide to the impulse winding test and printed circuit board designs with photographs of windings under test.
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Time-resolved linear and non-linear rheology of thixotropic and aging complex fluids: Application to particulate and biopolymeric physical gels
… rheometric techniques to quantify the behavior of mutating materials accurately. In the present study we first discuss the introduction of better time-resolved techniques in superposition rheometry. Conventional superposition rheometry consists of combining Small Amplitude Oscillatory …
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Post-Synthetic Chemical and Morphological Modifications of Polymer Membranes for Gas Separations
… functionality, and crosslinking in physical aging behavior of microporous membranes. This thesis primarily focuses on developing structure–property–performance relationships of FVM-modified membranes, offering strategic directions for the future development of high-performing microporous …
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The effect of environmental aging/exposure on the durability of high performance polymeric composites
… to undergo both physical as well as chemical aging. The aging time, temperature, and environment play a significant role in affecting the physical and chemical aging behavior in the polymers. Currently, there is a dearth of information on the combined effects of physical and chemical aging in …
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Quartz Crystal Microbalance with Dissipation Monitoring Applications in Polymer Thin Films Analysis
… thermoplastic films with air and moisture during aging by a powerful surface analysis instrument, a quartz crystal microbalance with dissipation monitoring (QCM-D). The assembly and interactions of glucan and chitin are crucial for understanding the fungal infection mechanism. Adsorption of …
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The influence of mixed hexagonal close-packed and face-centered cubic ordering on precipitation pathways and kinetics in sputtered superalloys
… (DCMS), on a superalloy can cause precipitation behavior that is inconsistent with bulk behavior. The rich planar defects present in the DCMS Haynes® 242™ used in this investigation caused the material to contain both face-centered cubic (FCC) and, unexpectedly, significant amounts of hexagonal …
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Prozessorientierte Untersuchungen zur Schmierstoffsynthese basierend auf Ölsäuremethylester und Glycerintrioleat
… fatty acid esters were stabilized against air-aging and their viscosity was raised. Further on many side reactions were minimized and the main components HISM and HIGTS were abuzz in each lubricant system. For lubricant characterization analytical methods as e. g. GC were developed and used to …
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Adsorption Kinetics and Phase Behavior of Particles Adsorbed at an Interface
… ability to predict the adsorption dynamic, phase behavior, and surface pressure of a monolayer of adsorbed particles in two-dimensional systems are key aspects of many current research areas. Examples include phase transitions in amphiphilic monolayers, emulsion stability due to particle …
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Microplasticity in metallic glasses
… (ii) degradation in properties over time due to aging, and (iii) abrupt and unpredictable failure. In the past five decades since their discovery, the primary focus related to their mechanical properties has been the structural changes due to plasticity accumulating beyond macroscopic yielding. …
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The differential effects of short-term physical exercise, environmental enrichment and their combination, and short- and long-term environmental enrichment on behavior and associated molecular changes in the brain of C57BL/6 mice
… cognition, enhanced anxiety- and depressive-like behaviors, and reduced locomotor activity, accompanied by neurobiological changes, such as enhanced inflammation, decreased neurotrophins, and altered neurotransmitter levels. Evidence suggests that external environmental conditions can modify the …