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 34 for “"epoxies"”.
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Investigation of Waterborne Epoxies for E-Glass Composites
… is presented which encompasses a study of epoxies based on diglycidyl ether of bisphenol A (DGEBA) cured with 2-ethyl-4-methylimidazole (EMI-24) in the presence of the nonionic surfactant Triton X-100. Interest in this epoxy system is due partially to the potential application as a …
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Physical Aging and Characterization of Engineering Thermoplastics and Thermoplastic Modified Epoxies
… endgroup became smaller.Thermoplastic toughened epoxies were also examined to clarify the importance of covalent bonds between toughener and epoxy on physical aging, relaxation time distributions and fracture toughness. In these studies the covalently bonded tougheners differed from their …
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Formulation, development, and characterization of magnetic pastes and epoxies for thick film inductors
… of thick film ferrite pastes and ferrite epoxies and the design, construction, and evaluation of thick film spiral inductors. Wideband characterization (DC - 2GHz) of ferrite pastes, ferrite epoxies, and ferrite substrates is performed using two techniques. These techniques are based on …
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Investigation of Adhesive and Electrical Performance of Waterborne Epoxies for Interlayer Dielectric Material
The primary differences between the solventborne and waterborne epoxy printed circuit board (PCB) impregnating resins arise from the distinct physical compositions and drying characteristics of the polymer solution and the latex emulsion. The presence of residual surfactant from the waterborne …
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Effect of the interphase on the thermo-mechanical response of unidirectional fiber-reinforced epoxies: modeling, analyses and experiments
… stresses in unidirectional fiber-reinforced epoxies. The governing field equations in terms of displacements are solved in “closed form”. It is found that, although the solution is dilute, the property variations in the interphase have a distinct effect on the residual thermal stresses. This …
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Characterization and interphase mechanical properties of epoxy/PVP blends
… regions, in the form of pure and modified epoxies were synthesized in the laboratory. Several characterization techniques were used to identify the properties of these modified epoxies. They were: 1) Tensile Tests: 2) Fracture Toughness Tests; 3) Thermogravimetric Analysis (TGA): 4) …
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Development of Bismaleimide/Cyanate Ester Based Aerospace Polymers for Possible Use in NASA's Relaunchable Vehicles Program
… of metals. Polymers such as polyimides and epoxies have been used to satisfy many needs, but strength, temperature resistance, and ease of processing are difficult to incorporate into a single polymer. Because of this gap, bismaleimides and cyanate esters, and possibly combinations of the …
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Electrical Insulation for High Temperature Superconducting Power Cables for Electric Transport Systems
… on the dielectric properties of cryogenic epoxies as electric insulation material for HTS power cables for electrical transport systems such as electric ships and aircraft. This thesis focused on three areas: a study to understand the various materials used for electrical insulation for …
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The effects of rubber modification on friction and wear of epoxy networks
… to detect whether abrasive wear of modified epoxies responds differently than fatigue wear to the fracture toughness. Other experiments were performed in which the wear debris produced during sliding was blown out of the interface to study its influence on friction and wear behavior. The …
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In-Situ Measurement of Resin Shrinkage for Aerospace Components
… of resin shrinkage in two common aerospace epoxies, Epoxy 105 and EPON 862. An average compressive strain of 0.00896 was observed for Epoxy 105 and 0.01042 for EPON 862. Differential Scanning Calorimeter (DSC) is used to measure the degree of cure for the two epoxies, and to correlate resin …
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Pullout Strength of Epoxy Anchors Installed Underwater
… pullout strength of epoxy anchors. Two different epoxies were tested at embedment depths of two, four, and six bar diameters. These tests utilized three distinct installation procedures under dry and submerged conditions. The testing program occurred over five phases, with the final round used in …
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Ultra-thin moisture barrier coatings for passive components
… Conventional protective coatings, such as epoxies and polyurethanes, are extremely thick--usually over 1 mm. Previous work has shown that a thick coating leads to a large equivalent series inductance (ESL) of the capacitor, and negatively affects the capacitor performance. An ultra-thin …
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Local and Effective Mechanical Properties of Polymer Nanocomposites
… on the mechanical property improvement of epoxies pointed to the fact that nanostructured materials provide improvements mainly on the toughness of an epoxy. In this regard, local information of the interfacial properties of embedded nanoparticles can be the key in developing calibrated …
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Ultrasound detection using singlemode optical fibers with applications to epoxy cure monitoring
The state of cure of epoxies is an important issue in the manufacture of graphite epoxy composites used in aerospace structures. Variations in the initial state and process used to cure the epoxy resin in a composite material lead to variations in the mechanical properties of the part manufactured …
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Low-Temperature Sintering of Nanoscale Silver Paste for Semiconductor Device Interconnection
… materials such as solder alloys and conductive epoxies. After solving the organic burnout problems associated with the covered sintering, a lead-free semiconductor device interconnect technology has been designed to be compatible with the existing surface-mounting techniques with potentially …
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Synthesis and characterization of m-aminophenoxide functionalized poly(tetramethylene oxide)
… such as polyamides, polyurea copolymers and epoxies, and may act to toughen these types of materials.
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Film formation on precious metal surfaces in the presence of epoxy resins
… 125 °C and 125, 160 °C. The composition of the epoxies used were 27.0 and 31. 5 parts (MDA) per 100 parts epoxy. The metals investigated were pure gold, silver, and copper; gold-copper alloys; gold-silver alloys; and electroformed gold-copper alloys. The alloys ranged in composition from 75 to …
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Epoxy + Liquid Crystalline Epoxy Coreacted Networks
… in-situ polymerization of liquid crystalline epoxies (LCEs) and a non-liquid crystalline epoxy has been investigated. Three LCEs: diglycidyl ether of 4,4'-dihydroxybiphenol (DGE-DHBP) and digylcidyl ether of 4-hydroxyphenyl-4"-hydroxybiphenyl-4'-carboxylate (DGE-HHC), were synthesized and …
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EXPERIMENTAL STUDIES OF THE CHEMICAL EFFECTS OF ZINC-BEARING MATERIALS FOLLOWING A LOSS-OF-COOLANT ACCIDENT IN A PRESSURIZED WATER REACTOR
… latent dirt, fiberglass insulation, paints, epoxies, and chemical products which form when containment surfaces interact with the released reactor coolant. Chemical effects experiments have been completed to assess the potential debris loading contributions of zinc-bearing materials found in …
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