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 20 of 80 for “"Thermal and Mechanical Properties"”.
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THERMAL AND MECHANICAL PROPERTIES OF NOVEL CARBIDE MATERIALS
<p>"This research focuses on studying the thermal and mechanical properties of novel carbide materials at room and elevated temperatures. The novel carbide materials investigated include zeta phase tantalum carbide (ζ-Ta<sub>4</sub>C<sub>3-x</sub>) and a high entropy (Ta,Hf,Nb,Zr)C carbide. The …
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Evaluating Thermal and Mechanical Properties of Electrically Conductive Adhesives for Electronic Applications
The objective of this study was to evaluate and gain a better understanding of the short-term impact performance and the long-term durability of electrically conductive adhesives for electronic interconnection applications. Three model conductive adhesives, designated as ECA1, ECA2 and ECA3, …
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Effects of asphalt rejuvenator on thermal and mechanical properties of oxidized hot mixed asphalt
The utilization of asphalt rejuvenator, and its effectiveness for restoring thermal and mechanical properties was investigated via Disk-shaped Compact Tension (DC(T)) testing and acoustic emission (AE) testing for determining the embrittlement temperature of the mixtures. During the DC(T) testing …
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Influence of Electrostatic Interactions and Hydrogen Bonding on the Thermal and Mechanical Properties of Step-Growth Polymers
… of novel, segmented, cross-linked networks and thermoplastics for emerging technologies. Tailoring macromolecular structures for improved mechanical performance can be accomplished through a variety of synthetic strategies using step-growth polymerization. The synthesis and characterization …
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Investigation of the optical, thermal, and mechanical properties of a bulk polymer using the surface thermal lensing technique
<p>The sensitive and simple photothermal technique of Surface Thermal Lensing (STL) was employed to study the thermo-mechanical response of an amorphous polycarbonate as a bulk. A discussion is given of how previously developed theories did not fit well with the present work. Therefore, only …
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Synthesis, Molecular Weight Characterization and Structure-Property Relationships of Ammonium Ionenes
… are commonly referred to as x,y-ionene, where x and y represent the number of methylene groups between quaternized nitrogens. Synthesis of aliphatic ammonium ionenes has been studied since the early twentieth century; however, absolute molecular weight characterization has only been performed …
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Design of Functional Benzoxazine Materials Via Thiol-Mediated Reactions
… functional benzoxazine monomers based on phenol and either propargyl amine or allyl amine were carried out to investigate the effect of introducing benzoxazines into thiol-alkyne or thiol-alkene networks on the thermal and mechanical properties of the networks. The thiol-alkyne polymer networks …
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Improving the thermal shock resistance of silicon carbide ceramics
… of the Ph.D. research has been to increase the thermal shock resistance of silicon carbide (SiC) based ceramics. Several applications utilize SiC in conditions generating thermal stresses, including but not limited to, heat exchangers, rocker nozzles, turbo charger rotors and combustion engine …
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Biodegradation and Properties of Phosphated Polyurethanes
… plastics are produced annually, to meet the expanding global demand. The use and misuse of plastic, followed by the subsequent mismanagement of waste, has raised great environmental concerns. Despite the recognition of the problems faced the production of plastic continues to increase. This …
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TOWARDS INTEGRATION OF GRAPHENE IN ADVANCED CMOS INTERCONNECT TECHNOLOGY
… interest. With its unprecedented electrical, thermal and mechanical properties, graphene is ideally suited for back-end of line (BEOL) technology to boost the performance of on-chip copper (Cu) interconnects. However, the lack of BEOL compatible methods has stymied the true evaluation of …
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Design of multidimensional nanophotonic materials with improved performance and functionalities
Multi-dimensional (2D and 3D) architectures with characteristic feature sizes on the order of a micrometer and below can exhibit extraordinary properties that are not present in their non-structured counterparts. Of particular interest are 3D microstructures, which have been found promising due to …
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Designing Multiphase Step-Growth Polymers for Advanced Technologies: From Electromechanical Transducers to Additive Manufacturing
The synthesis and characterization of step-growth polymers with novel monomers provided materials with tailored properties for emerging technologies. Specifically, multiphase materials (i.e., microphase separated block copolymers) exploit the synergistic relationship of combining polymers with …
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Underfill material selection for flip chip technology
… tests were performed to determine the material properties, process properties, and the reliability of each underfill material. A material with a fast flow rate, uniform and void free flow pattern, fast curing schedule, good thermal and mechanical properties, and good reliability results is …
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The Effect of Salt Splash on Nylon 6,6
… of various salts (NaCl, KCl, CaCl2) on the thermal and mechanical properties of nylon when exposed to one and four molar aqueous salt solutions. It was found that the diffusion of salt solutions into nylon 6,6 occurred in a pseudo-Fickian manner. Also, it was found that the presence of salt …
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Standardization of recycled plastic materials for additive manufacturing
… material in the form of wires or pellets, and a 3D-printer equipped with an extruder. Recycled polymeric materials can be used as feedstock for this technology. This thesis aims to enhance the quality of some plastic wastes to meet the standardized thermal and mechanical properties and make …
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Multifunctional polymeric foams: preparation, characterization, and environmental aspects
… 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 in syntactic foams can be obtained …
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High Performance Engineering Polymers: Design, Properties, and Performance
… including polysulfones, polyesters, polyimides and polyureas. Copolymers ranging from random to segmented sequences provided insight into the influence of segment length on physical properties. Melting temperatures, glass transition temperatures, and mechanical properties responded …
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Computational Analysis of Silicon Nanoelectromechanical Systems
… model, the local quasiharmonic (LQHM) model, and the reciprocal space quasiharmonic (QHMK) model are investigated. Within this framework, we compute the effect of the temperature and strain on mechanical properties of silicon. We also compute the mechanical response of silicon nanostructures …
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