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 24 for “"moisture uptake"”.
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Investigation of Waterborne Epoxies for E-Glass Composites
… by the aqueous phase of the waterborne resin. Moisture uptake experiments were also performed on epoxy samples that were filled with spherical glass beads as well as multi-ply laminated composites. No increases in the diffusion constant could be attributed to the surfactant. However, the …
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Durability of Advanced Woven Composites in Aerospace Applications
… project was to evaluate and model the effects of moisture, temperature, and combined hygrothermal aging on the durability of a graphite/epoxy woven composite material system. Imposed environmental and aging conditions were considered to be representative of service conditions for the engine of an …
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Occult moisture inputs in the fynbos : Foliar moisure uptake in Ericaceae, Restionaceae and Proteaceae / Annabelle J. Rogers
'Occult' precipitation may be an important moisture source that can impact specific plant responses to water stress in certain ecosystems. Species in many ecosystems have been shown to use this moisture source via foliar moisture uptake. The Cape Peninsula and the surrounding southern coast …
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Study of Durability of Epoxy Bonded Joints in Aqueous Environments
… to evaluate their mechanical properties. The moisture uptake of the neat epoxy increased with exposure time, and the bending modulus of the neat epoxy decreased with aging time and moisture uptake. It was found that the interfacial shear strength decreased with aging time for both epoxy bonded …
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Fundamental Importance of Fillers, Cure Condition, and Crosslink Density on Model Epoxy Properties
… Fumed silica did not significantly affect moisture diffusion properties. Next, a linear dilatometer was used to investigate the effects of cure conditions, mold types, and the presence of filler in the model epoxy. These studies revealed that there was substantial shrinkage in the cured …
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Protein stability: Impact of formulation excipients and manufacturing processes in protein-based pharmaceuticals
… additional excipients were added to prevent moisture uptake due to the hygroscopic properties of the amino acids and to provide lyo- and cryo- protection for the protein molecule during freeze drying. Without further purification, BSA solutions prepared by using sonication, low shear rotor …
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Thin Film Polymer Dielectrics for High-Voltage Applications under Severe Environments
… attributes include thermal stability, low moisture uptake, high breakdown voltage (low leakage current), low dielectric constant, low loss tangent, high glass transition temperature, and low surface roughness. The use of these polymers allows for advanced electronic packaging techniques, …
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The role of lake enhancement in the evolution of the 2011 Chicago-area Groundhog's Day blizzard
… The frontal inversion limited atmospheric moisture uptake. Large differences, however, were noted in downwind temperature and dewpoint fields, and wind fields over the lakes. Noteworthy changes were also observed in ground-level to 850 hPa lapse rates and surface layer instability.
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The cure of and moisture ingress into epoxy resins
… of the results. The second aim was to quantify moisture ingress through gravimetric measurements and dielectric spectroscopy. Although in certain systems a close correspondence between the different methods is observed this can not be generally assumed to be true in all cases. It would appear …
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FTIR-ATR Characterization of Hydrogel, Polymer Films, Protein Immobilization and Benzotriazole Adsorption on Copper Surface
… different monomers possess a common property of moisture absorption. In this work two monomers were used namely 1-amino-2-propanol (1A2P) and 2(ethylamino)ethanol (2EAE) to produce polymer films deposited on Si ATR crystal. Their moisture uptake property was tested using FTIR-ATR technique. This …
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Manipulation of Carbon Nanostructures for Multifunctional Composite Materials
… up to a ∼75 % increase in modulus and low moisture uptake. At 2 wt % loading GO, the composite films exhibit a conductivity of 1.25 × 10 -5 S/cm. The layer-by-layer (LbL) assembly technique was also employed in the fabrication of thin film composites of CCG and PI. The assembly was driven …
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Characterization of Broiler Lines Divergently Selected for Breast Muscle Color
… all lines for pH and color, drip loss, and moisture uptake at the processing ages of 5, 6, 8 and 10wks of age. For the HMC and RBC lines, 24h color did not differ between the processing ages. For the LMC line, the 5wk group was significantly lighter than the remaining age groups, possibly …
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Melt extrusion and continuous manufacturing of pharmaceutical materials
… polyvinyl alcohol based coating material reduces moisture uptake during storage. The coating material preferentially uptakes water from the atmosphere, restricting moisture from entering the tablet core and causing premature dissolution or degradation. The dissolution behavior of Molecule A …
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Designing Acrylic Block Copolymers with Multiple Hydrogen Bonding or Multiple Ionic Bonding
… ordered morphology and enhanced resistance to moisture uptake. A facile 2-step synthesis provided doubly-charged styrenic DABCO salt monomer(VBDC₁₈BrCl) containing an octadecyl tail. RAFT polymerization allowed the preparation of DABCO ABA block copolymers with defined molecular weights and low …
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Algal sludge disposal in waste-water reclamation
… of air dried algal sludge resulted in a maximum moisture uptake of 50 percent of the final wet weight. Dry algal sludge contained 47 to 61 percent volatile solids, 1.6 to 5.2 percent total phosphorus, and 3.6 to 4.9 percent organic nitrogen. No significant amount of ammonia nitrogen or …
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Studies of the interactions of CCA and ACA preservative treated wood with soil
… leaching reduced the subsequent moisture uptake and increased the durability of CCA-treated wood during soil burial, though untreated wood was unaffected. However, similar rates of microbial decay of untreated wood blocks occurred over a range of different wood moisture …
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Bio-inspired Design and Self-Assembly of Nucleobase- and Ion-Containing Polymers
… wide service temperature window, and low moisture uptake as soft adhesives. A library of styrenic DABCO salt-containing monomers allowed the synthesis of random ionomers with two quaternized nitrogen cations on each ionic pendant group. Thermomechanical, morphological, and rheological …
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Application of thermocouple psychrometers to field measurements of soil moisture potential.
… has made possible the measurement of soil moisture potentials to values as low as -80 bars. The applicability of this type of psychrometer to "in situ" measurements of moisture potential at a Sonoran desert field site is investigated. An evaluation is made of the effect of variations in …
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Characterization of natural fibre reinforced biodegradable composities
… less reliance on oil sources. However, their moisture uptake ability, low thermal stability and quality variations are some disadvantages that restrict their use. Biodegradable polymers or biopolymers such as polylactic acid polymers (PLA) are polyesters of lactic acid, and originally made …
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Mechanisms of salt frost scaling on portland cement-bound materials: studies and hypothesis
… previously proposed for frost deterioration of moisture-isolated specimens of cement-bound materials. In moisture-isolated specimens, this ice body growth stops when the micro structure is drained to a certain extent. In a specimen ex-posed to salt frost attack, however, an outer liquid phase …
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