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 6289 for “"polymer"”.
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Concentration profiles at amorphous polymer-polymer interfaces
… and the asymmetric interfaces of two different polymers. The profiles obtained are used to study the properties of corresponding interface. Specular reflectivity of neutrons (SRN) and secondary ion mass microscope (SIMS) are used to examine the profiles and the properties.
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Three-dimensional polarization probing in polymer ferroelectrics, polymer-dispersed liquid crystals, and polymer ferroelectrets
… the inhomogeneous ferroelectric switching in polymer ferroelectric films (candidates to memory devices). The results shows the typical pinning of electric dipoles in the ferroelectric polymer under study and support the previous hypotheses of a ferroelectric reversal at a grain level via …
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In-column polymer modifications: Advancing polymer bonded phases
… nonporous silica stationary phases with tethered polymer chains (acrylamide) give excellent hydrophilic liquid chromatography (HILIC), a common method used in glycosylation analysis. These columns are limited by lack in reproducibility and stability. A new method to make polymer bonded phases to …
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Nanoparticle assembly in polymer thin films and polymer melts
Thesis (Ph. D.)--Michigan State University. Materials Science and Engineering, 2010
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Particle microstructure and polymer dynamics in concentrated polymer solutions
… of nanoparticle dispersions in concentrated polymer solutions are studied with extensive small angle scattering and NMR experiments. Silica nanoparticles are suspended in polymer-solvent mixtures. The effects of polymer induced interactions on the particle microstructure are examined with …
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Polymer coated superparamagnetic beads walking on polymer coated surface
… of coating the beads and the surface with a polymer, Polyethylene Glycol(PEG). PEG has been shown to undergo a transition from an expanded state to a collapsed state under certain salt concentrations and temperature ranges. By looking at this transition we can see if the use of a polymer …
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Fabrication and Application of a Polymer Neuromorphic Circuitry Based on Polymer Memristive Devices and Polymer Transistors
… fabricating a previously developed type of polymer neuromorphic architecture, termed Polymer Neuromorphic Circuitry (PNC), inspired by the McCulloch-Pitts model of an artificial neuron. The major contribution of this dissertation is a development of processing techniques necessary to realize …
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Chiral Polymer Photodetector
A polymer photodetector is fabricated using polythiophene with chiral alkyl side chains. The Cotton effect is observed in the CD spectrum of the photodetector, indicating an unequal absorbance of left- and right-handed circular polarized light (CPL). The photodetector is proven to be able to …
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Polymer Gradient Materials
… preparation and characterization of longitudinal polymer gradient materials (PGMs). The inspiration for this work comes from nature: mussel byssus threads are soft-hard gradient biomaterials. These gradient threads are formed by a polyaddition process, show unique mechanical properties and …
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Polymer Waveguide Amplifiers
Polymer-based optical waveguides are a promising technology for integrating optical links onto standard printed circuit boards as they enable cost-effective manufacturing and assembly as well as offer high bandwidth. The motivation for this work is to address the lack of amplifying components the …
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Conducting polymer actuators
Conducting polymers are unusual organic materials featuring high electronic conductivity. Recently it has been observed that some of these polymers change in dimension when their oxidation state is altered. Dimensional changes induced by electrochemical activation in the conducting polymer …
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Metal/polymer interactions
… Yet, there are a number of instances in which a polymeric material displaying low resistance and featuring similar physical, chemical, and thermal characteristics as polyimide would be desirable. Toward this goal, multilayered polyimide composite films have been produced through the homogeneous …
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Directed Phase Separation of Polymer Blends on Binary-Patterned Polymer Brushes
Self-assembly of well-defined polymer microstructures is of interest for applications such as polymer solar cells, light emitting diodes, microelectronics and biosensors. Chemically patterned substrates can direct the phase separation of thin films of polymer blends, producing controlled …
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Infululence of Polymer Nanoparticles on the Dewetting of Polymer Thin Films
… and type of the nanoparticles. The star polymers have polystyrene-benzocyclobutene copolymer arms which can undergo intra-molecular crosslinking to form relatively compact nanoparticles. The addition of a small amount of nanoparticles to linear PS thin films can suppress or enhance the …
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Polymer Nanocomposites: Polymer And Particle Dynamics And Its Application As Lubricant
… projects. First, I present a project entitled 'Polymer Nanocomposites: Polymer and Particle Dynamics' where I investigate dynamics of polymer and particle upon their mixing. On second part of the thesis, I present one of the application of polymer nanocomposites (PNC) entitled 'Nanoscale …
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Directing Polymer-Metal Binding Interactions by Modifying Polymer and Solvation Structure
… quantities of organic solvents. Metal-chelating polymers are a promising class of materials to improve or supplant these existing technologies due to their low cost and high tuneability. Much research has focused on designing specific ligands to bind REEs selectively and occasionally attaching …
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Polymer Structure and Dynamics in Nano-Confinements: Polymer Nanocomposiets and Cylindrical Confinement
Polymers have been used for variety of products for decades, and the usage of polymer products is still growing. Innovative methods (e.g. adding other materials) have been created to improve properties of polymer products to fulfill targeted requirements for applications and many of these …
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Short-time interdiffusion at polymer interfaces: A probe to study polymer motion
… experiments that could probe the motion of the polymer chains at the molecular level, and thereby suggest the mechanism of polymer-polymer interdiffusion. In the first experiment, a thin layer ($\sim$400-1500 A) of triblock polystyrene (HDH), wherein the central half of the chain was deuterated, …
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Field Induced Polymer Electroluminescence
… employing alternating current (AC) field-induced polymer electroluminescence (FIPEL). This device consists of a transparent conductor, polymer dielectric layers, charge generation layers, a conjugated polymer-based emissive layer, and reflecting electrode. Emphasis is placed on a …
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