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 “"Cross-linked polymer"”.
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Self-assembly of cross-linked polymer micelles into complex higher-order aggregates
The creation of complex polymer structures has been one of the major research topics over the last couple of decades. This work deals with the synthesis of (block co-)polymers, the creation of complex and stimuli-responsive aggregates by self-assembly, and the cross-linking of these structures. …
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An NMR Study on Solvent-Polymer Interactions
<p> Approximately 80 percent of all synthetic polymers used are cross-linked polymers, unfortunately the characterization of cross-linked polymers has not kept up with their use. This study tries to help in the characterization of cross-linked polymer systems. More specifically the interactions of …
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The synthesis of liquid crystalline materials for organic semiconductor device applications
… synthesised. These materials incorporate photo-polymerisable (non-conjugated diene and methacrylate) and chemically-polymerisable (oxetane) end-groups, attached by aliphatic spacer units of varying length to an aromatic core. These photo- and chemically-polymerisable end-groups are situated at …
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Chemical sensors based on swellable polymer microparticles and molecular imprinted polymers
<p>Swellable thermoresponsive and lightly cross-linked polymer microparticles were prepared for the development of chemical sensors for various target analytes. The swelling and shrinking of the polymer particles as a function of concentration of target analytes has been investigated using …
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The preparation of cucurbit[8]uril-based hydrogels for delivery applications
… to an aqueous solution of guest-functional polymers leads to the formation of cross-links and hydrogels. The first results chapter of this thesis explores the relationship between cross-link dynamics and molecular cargo delivery. The release rate increases with increasing rate of …
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Porphyrin Cross-Linkers for Generating Soluble Molecularly Imprinted Polymers from Polyethyleneimine
… for a given target molecule based on synthetic polymers. The molecularly imprinted polymer (MIP) contains a three dimensional network with a memorized cavity specific to the shape and functionality of the templated target molecule. The utility of traditional MIPs has been limited due to an …
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Mechanics of amorphous polymers and polymer gels
Many applications of amorphous polymers require a thermo-mechanically coupled large-deformation elasto-viscoplasticity theory which models the strain rate and temperature dependent response of amorphous polymeric materials in a temperature range which spans the glass transition temperature of the …
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Surface Properties of Hydrophilic Polymers
Polymers based entirely or substantially on hydrophilic monomers have achieved importance in recent years largely because of their ability to absorb water and form (in the case of cross linked polymer) soft, elastic gels (‘hydrogels'). The surface properties of this group of materials are important …
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Enabling integration of vapor-deposited polymer thin films
… for synthesizing conformal and functional polymer thin films on a variety of substrates. This thesis emphasizes the development of tools to further enable the use of iCVD for industrial applications. The ability to pattern polymer thin films is a prerequisite for device fabrication. Two …
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Self-assembly of sulfonated amphiphiles for channel-like synthetic membranes
… the proper temperature. The target molecule with polymerizable groups was also found to exhibit a hexagonal columnar mesophase between 115°C and 233°C, as well as in semi-polar methacrylate solvents as the concentration exceeded 70wt%. Photo-curing this hexagonal columnar mesophase results in a …
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Engineering tough, hygroscopic, and active hydrogels for surgical simulation and anti-biofouling
… stems from their structure, consisting of a 3D cross-linked polymer network containing mostly water. This structure leads to a material with tunable, tissue-like softness and water content, biocompatibility, resistance to biological fouling, high porosity, and transparency. However, the utility …
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Design of Cleavable Monomers and Cross-Linkers for the Synthesis of Degradable Polymer Architectures
… with different chemical compositions and various polymer architectures, are desirable for countless purposes, ranging from biological applications to recyclability of plastic waste. The creation of brand-new materials with useful, desired properties and built-in degradability is, however, very …
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Modeling interactions between cells and the aqueous environment
… hydrogel-supported lipid-bilayer. Hydrogels are cross-linked polymer networks that can absorb large amounts of water without dissolving or loosing their shape. A number of hydrogels are stimuli-sensitive. They can change their structures and properties in response to changes in environment, such …
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NMR investigations of cyanate resins
Heterogeneous polymer products are very complex systems. In many cases, the properties of these polymer systems are determined by the nature and the degree of reaction of a small number of functional groups in the system. However, it is very difficult to study them by most analytical techniques due …
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Polymer, Metal, and Ceramic Microtubes by Strain-driven Self-rolling
A thin polymer bilayer film was transformed into micro- and nano-tubes using strain driven self-rolling phenomena of polystyrene (PS)/poly (4-vinyl pyridine) (P4VP) film. Polymer bilayer was produced by consecutive deposition of PS and P4VP, from toluene and chloroform solutions, respectively, by …
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Synthesis and applications of ceramic (silicon carbide and silicon nitride), metallic (cobalt(0)) and polymeric (polyurethane) aerogels
… prepared from compressed compacts of polyurea-crosslinked silica xerogel powders. The process is time efficient as solvent-exchange through powders is fast, and energy efficient as it bypasses drying with supercritical fluids. The final ceramic objects were chemically pure, sturdy, with …
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YIELDING PHENOMENA IN MICROGEL SUSPENSIONS ACROSS LENGTH SCALES
… densely packed microgels—microscopic, swollen, cross-linked polymer particles. Understanding the connections among structure, microscopic behaviors, and macroscopic properties is critical for developing advanced and sustainable materials. During my PhD research, I addressed key questions …
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Engineering nanostructured selective layers for reverse osmosis membranes
A major challenge to communities across the world in the next century will be ensuring millions have access to adequate freshwater resources. Studies from the UN World Health Organization indicate that over 1.1 billion people currently lack access to reliable and secure freshwater supplies, with an …