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 195 for “"Polymer chemistry"”.
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Polymer Chemistry for Improved Self -Healing Composite Materials
Polymeric composite materials that are able to undergo self-healing through a microcapsule-based mechanism have been developed. The first successful example of this type of material was based on the ring-opening metathesis polymerization of endo-dicyclopentadiene using Grubbs' catalyst. The work …
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Unusual molecular architectures in liquid crystal and polymer chemistry
… of both small molecules (liquid crystals) and polymeric materials. In both cases, the ultimate goal is the creation of materials that display unique properties that arise due to molecular organizations and/or interactions driven by the underlying shape of the molecules or subunits. Chapter One …
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Coupling molecular conformation to polymer chemistry and composition via flow
There has been extensive study on the behavior of polymers in the presence of fluid flow over the past century. There remain, however, fundamental questions about how flows couple to molecular degrees of freedom and vice versa. This pressing problem has profound implications in polymer processing …
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Doubly Bonded Derivatives of Si and Ge: Cycloaddition Reactions and Polymer Chemistry
… an effort to give a broader understanding of the chemistry of the addition of phosphine oxides to (di)tetrelenes. In general, a 1,2-adduct is formed which appears to be derived from the isomeric hydroxyphosphines. Notably, the phosphine oxides are reduced during the course of the reaction. A …
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Polymer chemistry education to increase student awareness of plastic pervasiveness and environmental impact
<p>A polymer-pollution-focused laboratory sequence was written to teach general chemistry concepts in a course for pre-service elementary teachers. Students experienced the difficulties related to polymer pollution clean-up and made bio-based materials to see possible alternatives. In order to …
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Design, synthesis and characterization of photocage molecules for light-activated release: Applications in polymer chemistry and phototherapeutics
… it. The alkenylated BODIPY was introduced into a polymeric chain along with thiol moieties and a novel highly cross-linked hydrogel was synthesized. The work extended to explore the use of different concentrations of the BODIPY molecules in the polymer as well as their formation in different light …
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Development of N-heterocyclic carbene ligands for nanomaterials in aqueous media and expanding the interface of metal-organic framework (MOF) and polymer chemistry via polyMOFs
In the field of coordination chemistry, there are many standard organic ligand designs that are optimized for their ease of synthesis as well as established and favorable properties. Nevertheless, there is still room to add new ligand classes to the toolbox for specific applications. This thesis …
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Influence of static and dynamic topography on osteoblast proliferation and maturation
… a high cost. Cheaper alternatives may exist with polymers for some non-load bearing applications. Advancements in polymer chemistry have yielded a class of smart materials called shape-memory polymers (SMPs), which can change their shape via changes in temperature or mechanical stress. This study …
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Design, Development, and Study of New High-Throughput Biodegradation Test for Polymers
… the biodegradability information of over 600 polymer chemistries. This large dataset highlights some relationships between polymer chemistry and biodegradability. Secondly, an improved design of a clear-zone monitoring robot leads to higher accuracy of the extracted data. In combination with a …
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Molecular design of nanoparticle-based delivery vehicles for pneumonic plague
… an introduction into the threat of bioterrorism, polymer-based controlled delivery systems and challenges associated with vaccine design.</p> <p>Chapter 2 is a detailed literature review of topics related to the research conducted in this dissertation. Areas covered include basic immunology, …
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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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Characterization of polyphenoxy-ethylphenoxyphosphazene-bulk sealant applications
Polymer chemistry has primarily been a main chain carbon-based science, but recently the usage of inorganic polymeric materials has increased with polyphosphazene research leading the way. The credit for the increased interest in the field of phosphazene chemistry arises from the unique physical …
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Thermal and oxidative degradation of an aromatic polyamide
… on oxidation reactions already established in polymer chemistry. These include a mechanism of β scission by an alkoxy radical thought to be responsible for the creation of the homologous series. MXD,6 fibres were also spun incorporating 100, 200 and 400ppm of a cobalt catalyst and the effect of …
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A 'Toolkit' of Small Molecules for Polymer Assembly and Post-Synthetic Modification Using 'Click' and Photoactive Chemistries
… toward the goals of constructing and modifying polymeric materials according to simple, generalizeable, and universal processes. The prepared compounds rely upon a combination of photochemistry and the 'click' philosophy to alter the architecture, bulk properties, or surface chemistry of …
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Part I: Strategies for the Synthesis of Monodisperse Polymers and Cyclic Polymers. Part II: Synthesis of Dipyrromethenes and Aza-dipyrromethenes from Aromatic Nitriles
… an introduction to some contemporary problems in polymer chemistry, but also contains what is essentially a mini-review of catalyst transfer polymerization (CTP). This part of the chapter elucidates a number of common misunderstandings of CTP that are present in the literature. It goes onto …
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Direct Measurements of Polyelectrolyte Brush Responses using Atomic Force and Optical Microscopy
… of the response properties of these polymer surfaces. For that purpose new methods are developed which combine force spectroscopy and optical microscopy. As well, established physico-chemical techniques are used. Polymer brushes provide an excellent building block for responsive …
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Plasticity Against Plastic: Synthetics In The Practice, Theory, And Conservation Of Art Since The 1960s
… continental philosophy, transgender studies, and polymer chemistry, this study parses out the relationship between plastic and plasticity as a dialectic of becoming plastic, or hardening into a stable form or category, and the movement of plasticity, a dynamic that destabilizes hierarchies. Art …
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Development of novel polymeric architectures for applications in drug delivery and studies towards the synthesis of perfect polymers by iterative exponential growth "Plus" (IEG+)
Polymeric materials are ubiquitous in numerous facets of everyday life, and their applications will only become increasingly prevalent as the field of polymer science advances. The first chapter of this thesis describes the use of polymeric nanoparticles to overcome challenges in traditional drug …
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Structural Characterization and Material Property Evaluation in Polymer-Derived SiOC Ceramics and Ceramic Nanocomposites
… for aerospace, energy, and electronics sectors. Polymer-derived ceramics (PDCs) and specifically polymer-derived silicon oxycarbide (SiOC) are a promising and attractive material class to accommodate the need for novel ceramics with tailorable compositions and material properties. SiOC is a …
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