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 21 for “"thermal transitions"”.
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Rheological characteristics of solvent free nanofluids: Thermal transitions and reactive curing
… work documents the basic rheological parameters, thermal transitions, and curing kinetics of various solvent-free nanofluids synthesized by Zhiming Qiu and Kejian Bian at the Coating Research Institute at Eastern Michigan University.</p>
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Capillary rheometry of soy isolate dough
… capillary rheometer at 298K, 333K and 363K. Thermal transitions of 10 to 100% soy isolate dough are measured using a Perkin-Elmer Differential Scanning Calorimeter (DSC-2) over 310 to 350K. The observed behavior of the soy isolate doughs is explained in terms of a network based on temporary …
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An investigation into the structure and properties of polyethylene oxide nanocomposites
… the influence of nano-additives on the physical, thermal and electrical properties of poly(ethylene oxide) systems. The initial objective is to investigate the extent to which dispersion of nanofillers and effect of host molecular weight can be inferred from rheological analysis. This …
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The design and analysis of sugar-based carrier systems for the protection of nucleic acids
… exist in two different amorphous forms. Reported thermal transitions of trehalose dihydrate vary with environmental conditions and particle size. The first area of this thesis focused on investigating the inter-conversion properties of trehalose dihydrate to observe if an in-depth understanding of …
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Assessment of a marine polysaccharide for use as excipient in pharmaceutical hot-melt extrusion
… is determined by thermogravimetric analysis. The thermal transitions of the extrudates are determined by Differential Scanning Calorimetry.
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Thermal and Morphological Study of Segmented Multiblock Copolyesters Containing 2,2,4,4-Tetramethyl-1,3-cyclobutanediol
Thermal and morphological studies of the segmented multiblock copolyesters containing 2,2,4,4-tetramethyl-1,3-cyclobutanediol and dimethyl-1,4-cyclohexane dicarboxylate were carried out using differential scanning calorimetry, small angle X-ray scattering, wide angle X-ray diffraction and dynamic …
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Order in side-chain liquid crystalline diblock copolymers
… scattering (SAXS) and electron microscopy, and thermal transitions were identified using polarized microscopy, calorimetry, and elevated temperature-SAXS. We found the formation of micron-sized domains and focal-conic superstructures to depend on the length of the PS block and the overall …
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Linking Thermophysical Transitions and Rheological Properties to Polymer Foaming Outcomes with Carbon Dioxide
… allows for the assessment of the depression in thermal transitions (Tg and/or Tm/Tc) and the changes in rheological properties like modulus or rigidity of polymer systems exposed to carbon dioxide. MSB provides for the assessment of the amount of carbon dioxide that sorbs into a polymer material …
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Large Polymers that Behave Like Small Polymers
… units create stiff polymer chains with excellent thermal and mechanical properties, at the expense of processability. Meanwhile, flexible monomer units like ethylenes and siloxanes create soft, flexible plastics at the expense of thermal and mechanical robustness. Synthesizing polymers with novel …
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Infrared Study of the Nonequilibrium Glassy State of Polymers (Frequency Shifts)
… established as a useful technique to identify thermal transitions, mechanical relaxations, molecular mobility and the extent of aging in polymer glasses.
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Toxicity and drug delivery ability of bio-inspired silica nanoparticles
… as ζ potential, AFM and FTIR spectroscopy and thermal transitions were measured using DSC. With a significant difference in the molecule release based on the formulation method, this project shows that bio-inspired silica nanoparticles can be useful for a variety of drugs and the release can be …
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Synthesis and Non-Covalent Interactions of Novel Phosphonium-Containing Polymers
… in regards to their aggregate characteristics, thermal stability, and antibacterial activity. Ionic aggregation in phosphonium-based polymers provides thermoreversible crosslinks, ideal for reversible self-assembly, self-healing, and smart response. In polymers, these ionic functionalities …
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DISORDER EFFECTS IN FRUSTRATED MAGNETS AND ABSORBING STATE TRANSITIONS
… which covers the basic concepts of phase transitions and scaling as well as the physics of Josephson junctions, the dissertation focuses on three separate projects.</p> <p>The first project is motivated by the stripe and nematic phases observed e.g. in cuprate superconductors and iron …
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Synthesis and Characterization of Phenylethynyl Terminated Poly(arylene ether sulfone)s as Thermosetting Structural Adhesives and Composite Matrices
… allowed for further control of the processing, thermal transitions and adhesive properties of the thermosets. A systematic series of phenylethynyl terminated oligomers derived from either bisphenol A, or wholly aromatic hydroquinone or biphenol has been synthesized and characterized to determine …
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Moisture-Cure Polyurethane Wood Adhesives: Wood/Adhesive Interactions and Weather Durability
… distribution (atomic force microscopy, AFM), thermal transition temperatures (dynamic mechanical analyses, DMA), and urethane/urea hydrogen bonds (Fourier transform infrared spectroscopy, FTIR). The effects of hard segment content on properties of PUR prepolymers, and cured PURs (films and …
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Sterically Crowded Copolymers Based on Functionalized Stilbenes
… in 1H NMR spectra were observed. There were no thermal transitions measured by DSC below the degradation temperature. A strong polyelectrolyte effect, for both stilbene and styrene copolymers, occurred in deionized water and was suppressed by adding NaCl to the polymer solution. These results …
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Structural Changes and Chain Mobility During Processing of Bloodmeal-Based Thermoplastics
… and tri-ethylene glycol. Dynamic mechanical thermal analysis (DMA) and differential scanning calorimetry (DSC) were used to investigate thermal transitions and chain relaxation, accompanied by synchrotron based Fourier transform infrared spectroscopy (FT-IR) to investigate chain architecture …
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Novel oligomeric and polymeric materials based upon the dibenzotetraaza[14]annulenes.
… that many of the materials exhibit interesting thermal transitions from one crystalline state to another. However the use of thermal microscopy has not shown any of these phases to be liquid crystalline transitions. 2. The preparation of dibenzotetraaza[14]annulenes (metal complexes and free …
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Development and characterization of polyphthalaldehyde for transient applications
… into cPPA films to generate acid in response to thermal heating. The TAG poly(vinyl tert-butyl carbonate sulfone) (PVtBCS) forms acid at moderate temperatures (ca. 85 °C) in the presence of water and also depolymerizes into purely volatile products. Upon heating to 85 °C, the PVtBCS/cPPA films …
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Influence of Electrostatic and Intermolecular Interactions on the Solution Behavior and Electrospinning of Functional Nanofibers
… The counteranion selection controlled the thermal transitions and degradation; the larger and more charge-delocalized anions typically resulted in lower Tg and higher decomposition temperature. The polyelectrolyte behavior in solution was nearly independent of anion choice, though solution …
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