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 18 of 18 for “"molecular chains"”.
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Polyethylene fiber drawing optimization
… to bulk polymer because drawing aligns the molecular chains. I optimize the polymer fiber drawing method in order to achieve polymer fibers that are drawn to lengths exceeding 1cm and develop a method to cut and store them for future experimental purposes. With lengths exceeding 1cm, …
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Micro-and macromechanics of single crystal and polygrannular lamellar block copolymers
… class of thermoplastic elastomers. Their macromolecular chain consists of covalently bonded repeating blocks of thermoplastic and elastomeric molecular chains. When given the thermodynamic freedom, the chain constituents phase separate into domains of various morphologies with sizes that can …
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Characterization and Control of an Electrospinning Process
… information about the extension and order of molecular chains in a jet. Asymmetric illumination of an electrospinning jet made both the handedness and changes in handedness of the electrical bending coils apparent to visual observation and in 2-dimensional images. Other reliable methods for …
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An Alpha7beta1 Integrin-Based Treatment of Muscular Dystrophy
… and the dystrophin protein complex. Both act as molecular chains that connect the actin cytoskeleton to laminin in the basal lamina. Disruption of either linkage system leads to muscular dystrophy in humans and mice. To determine if the integrin complex can compensate for the lack of the …
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Spatio–temporal analysis of changes of shape for constituent bodies within biomolecular aggregates
… in suspension and thermallydriven motion of the molecular chains in enzymes are presented. Both models use orthogonal basis functions to describe the spatial dependences in a spherical geometry. Both models also describe the effect of time-dependent boundary data on the shape of the bodies …
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Development and Characterization of Advanced Polymer Electrolyte for Energy Storage and Conversion Devices
… from the double helical conformation of PBDT molecular chains. We primarily develop an ionic liquid-based polymer gel electrolyte that possesses the following exceptional combination of properties: transport anisotropy up to 3.5×, high ionic conductivity (up to 8 mS cm⁻¹), widely tunable …
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Understanding and Controlling Wettability of Carbon Powders for PEM Fuel Cell Applications
… to the orientation and coverage of the Nafion molecular chains on the carbon surface, as well as the roughness of the composite surfaces. Both contact angle kinetics (CAK) and water vapor sorption (WVS) measurements were then used to examine the relative wettability of several other types of …
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Electronic excited states in quasi- one- dimensional organic solids with strong coupling of Frenkel and charge-transfer excitons
… of the small radius exciton theory in linear molecular chains was adopted to examine the excitonic states. The excited states are composed of molecular excitations and nearest neighbor charge transfer (CT) excitations. We analyzed the structure and properties of the excited states which result …
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Ultrasonically Assisted Single Screw Extrusion, Film Blowing and Film Casting of LLDPE/Clay and PA6/Clay Nanocomposites
… Ultrasonic waves also broke down the polymer molecular chains reducing viscosity of the melt, facilating dispersion of the clay platelets throughout the matrix. Ultrasound also led to a breakage of the clay platelets reducing the particle size and improving their distribution. Clay particles …
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Mechanisms of polyphosphate degradation
… to thousands. Naturally, these molecular chains are stored in cells within organelles called acidocalcisomes—metal-filled acidic cellular compartments. Human platelets, for example, store polyP of 60-100mer in dense granules (a type of acidocalcisome); upon activation, platelets …
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Synthesis and characterization of polyether-ester liquid crystalline polyesters and poly(arylene ether ketone)-lcp segmented copolymers
… melt acidolysis techniques. The resulting high molecular weight polyarylates were amorphous polymers and the t-butyl groups along the polymer backbones were found to be thermoxidatively stable. Thermotropic liquid crystalline polyesters (LCPs) are well known for their thermoxidative stability, …
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Self-interaction and charge transfer in organic semiconductors
The fascinating properties of organic molecular semiconductors paved the way for a new class of electronic devices such as organic light-emitting diodes, transistors, or solar cells. Despite an inferior efficiency as compared to commonly used silicon-based technologies, organic semiconductors …
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Multimodal Polyethylene-Graphene Nanocomposite via Melt Extrusion
… This study reports on the reinforcement of high molecular weight multimodal-high-density polyethylene HDPE by a microwave-induced plasma graphene, via melt intercalation, using a closely self-wiping co-rotating twin-screw compounding extruder. The tailored process included designing a suitable …
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Energy and information transfer via coherent exciton wave packets
… the actual implementation focused on organic molecular assemblies for the sake of computational simplicity, ease of experimental implementation, potential for coherent transport, and promise because of reduced structural uncertainty. A laser design was derived to create exciton wave packets …
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Polyethylene Terephthalate / clay nanocomposites. Compounding, fabrication and characterisation of the thermal, rheological, barrier and mechanical properties of Polyethylene Terephthalate / clay nanocomposites.
… that some polymer has entangled and few oriented molecular chain at rest and when applying high shear rates, the level of entanglements is reduced and the molecular chains tend to orient with the flow direction. The other mechanism is that the nanoparticles align with the flow direction at high …
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Manipulative Scanning Tunneling Microscopy and Molecular Spintronics
… can be extended to more unique surface and molecular systems. A process for the formation, and topographic measurement, of covalently bound chains by surface catalysis is demonstrated with homogeneous magnetic and heterogeneous networks of molecules. The chain coupling occurs through an …
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Development of water-soluble PEG-based binder systems for Ti Metal Injection Moulding
… evaluate binder systems. Importantly, the macromolecular interactions between different binder components were investigated with Fourier-transform infrared (FTIR) spectroscopy. Furthermore, an in situ polarised optical microscope was employed to observe the PEG crystallisation process and reveal …
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The influence of degree of crystallinity on the thermal conductivity of nylon 66
… since heat is conducted mainly along the molecular chains, which contain primary valence bonds of about the same strength. Many investigators have shown that nylon is microcrystalline in nature, containing crystalline regions about 1000 Angstroms in diameter imbedded in a matrix which is …