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 23 for “"End-Functionalized"”.
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A Study of End-functionalized Polylactide based Thin Films for Biomedical Applications
… was to understand how topography and chemistry (end functionalization of PLA) of scaffolds impacts cell attachment, growth and proliferation. This was achieved by spin-coating PLA and Ionomeric PLA on glass coverslips followed by thermal annealing of these thin films that resulted in scaffolds of …
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Synthesis of Well-Defined Multi-End Functionalized Polymers via Living Anionic Polymerization
… work aimed at producing a series of multi-end functionalized polystyrene and polyisoprene additives with a wide range of molecular weights, carrying 1 to 3 fluoroalkyl groups that have been prepared by end capping the living chain ends of polymers prepared via anionic polymerization …
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Ruthenium alkynyl-terminated ladder-type oligo(p-phenylene)s
… of rigidified ladder-type oligo(p-phenylene)s end-functionalized by bis(dppe)-ligated ruthenium alkynyl units. Their optical, electrochemical and spectra electrochemical properties are discussed. Comparison of these results with non-rigidified ruthenium complexes allows for the determination of …
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Ruthenium alkynyl-terminated ladder-type oligo(p-phenylene)s
… of rigidified ladder-type oligo(p-phenylene)s end-functionalized by bis(dppe)-ligated ruthenium alkynyl units. Their optical, electrochemical and spectra electrochemical properties are discussed. Comparison of these results with non-rigidified ruthenium complexes allows for the determination of …
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Inorganic-organic hybrid materials and abrasion resistant coatings based on a sol-gel approach
… materials from polytetramethylene oxide (PTMO) end functionalized with triethoxy silyl groups and, tetraethylorthosilicate (TEOS) under basic conditions met with only partial success. The films obtained had low mechanical stability. This was attributed to the low reactivity of the triethoxy …
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Preparation of Fully Miscible Nanocomposites
… nanoparticle/polymer combinations. Not only end-functionalized homopolymers, but also commercially available copolymers with functional comonomers can be used for stable ligand exchange, demonstrating the versatility and broad potential of the method.
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Nanomechanics of cartilage extracellular matrix macromolecules
… physiological IS (0.1 M), significant rate dependence was observed, suggestive of visco/poroelastic interactions within the aggrecan layer. By using an aggrecan end-functionalized colloidal tip, shear of two opposing aggrecan layers was assessed in a similar fashion. Lower lateral force and a …
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In-situ steric stabilization of ultrafine titania particles synthesized by a sol-gel process
… polymer with poly(propylene oxide) back-bone was end functionalized to make it a suitable in-situ steric stabilizer. Effects of polymer concentration, functionality at chain-ends, and molecular weight on the particle size were studied. The polymer functionalized at both ends imparted in-situ …
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Fullerene-acene chemistry: Part I Studies on the regioselective reduction of acenes and acene quinones; Part II Progress toward the synthesis of large acenes and their Diels-Alder chemistry with [60]fullerene
… occurs at alternating rings such that the end rings and the internal terphenyl moieties were left intact. When large unsubstituted acenes are reduced, the reduction occurs with no selectivity resulting in complex mixtures of variously hydrogenated isomers. In all cases, the reduced acenes …
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Amphiphilic BAB-triblock copolymers bearing fluorocarbon groups : synthesis and self-organization in aqueous media
… of the homopolymers by GPC measurements, end- group analysis of the synthesized block copolymers via 1H-, 19F-NMR, and in some cases also UV-vis spectroscopy, were performed attaching suitable fluorinated moieties to the Z- and/or R-groups of the CTAs. Symmetric triblock copolymers of type …
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Advancements in branched bottlebrush polymers for responsive, targeted imaging
… for tissue-selective imaging. Toward this end, we propose the incorporation of known cellular targeting ligands onto the surface of branched bottlebrush polymers through the synthesis of end-functionalized branched macromonomers. The synthesis of several targeting ligands is described, …
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Self-Assembly of Matching Molecular Weight Linear and Star-Shaped Polyethylene glycol Molecules for Protein Adsorption Resistance
… for star molecules. Here, triethoxysilane end-functionalized linear PEG molecules have been synthesized and utilized to form star-shaped PEG derivatives based on ethoxy hydrolysis and condensation reactions. This resulted in PEG stars with up to ~4 arms, which were found to result in …
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Non-Covalent Interactions in Block Copolymers Synthesized via Living Polymerization Techniques
… and ionic aggregation were studied in block and end-functional polymers synthesized via living polymerization techniques such as nitroxide mediated polymerization and anionic polymerization. The influence of non-covalent association on the structure/property relationships of these materials were …
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New inverse opal hydrogels as platform for detecting macromolecules
… glycol) methacrylate derivatives (OEGMAs) that render the hydrogels thermoresponsive. Finally, the silica particles were etched, to produce highly porous hydrogel replicas of the CC. Importantly, the inner structure and thus the ability for light diffraction of the IOHs formed was maintained. The …
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Self-assembly of cross-linked polymer micelles into complex higher-order aggregates
… have a mixed corona or a Janus type corona, depending on the polymers that were chosen. Using NHS and EDC the micelles could easily be cross-linked by the formation of amide bonds in the core of the micelles. The higher-order self-assembly behavior of these core cross-linked complex coacervate …
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Weak polyacid brushes : synthesis, swelling behavior, complex formation and micropatterning
In this work, densely end-grafted polymer monolayers, so-called "polymer brushes", were covalently attached to solid planar surfaces and investigated with respect to their properties in contact with aqueous solutions of varying composition. <br> <br>The synthesis of these polymer brushes was …
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Linear Conjugated Molecular Wires: Organic Materials and Single-Molecule Electronics
… for their material applications. We envisioned functionalized oligoenes as molecular building blocks (i.e. conducting wires or rigid connectors) in the bottom up construction of new materials and devices. Their prototypical structure and variable length would make DPDCs ideal candidates for …
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Self-healing of high temperature cured epoxy and composites
… thus providing a means to significantly extend the service life and reliability of polymeric structural elements. A variety of applications of the capsule-based self-healing motif have been demonstrated over the past decade. However, the limitations of available capsule-based self-healing …
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Synthesis and Characterization of Linear and Crosslinked Mono-Sulfonated Poly(arylene ether sulfone)s for Reverse Osmosis Applications
… chromatography confirmed that the intended molecular weights were achieved. The copolymers were cast into dense films and the mechanical and transport properties were measured in their fully hydrated states. Tensile tests revealed mechanically robust, tough membranes with glassy …
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Influence of Electrostatic and Intermolecular Interactions on the Solution Behavior and Electrospinning of Functional Nanofibers
… behavior in solution was nearly independent of anion choice, though solution conductivity depended on the electrophoretic mobility of the counterion. Charge containing copolymers of DMAEMA and di(ethylene glycol) methyl ether methacrylate (MEO2MA) were synthesized and demonstrated that …
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