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 38 for “"Ring-opening metathesis polymerization (ROMP)"”.
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Synthesis and Application of Well-Defined Stimuli Responsive Materials
Ring opening metathesis polymerization (ROMP) was used to prepare well-defined azobenzene functionalized polymers with unprecedented control over molecular weight and functional group tolerance. The material's physical response to plane polarized light was studied in thin films and latex particles. …
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Bottlebrush and related polymer architectures for biomedical applications
… Synthesis of Multivalent Macromonomers for ROMP Here, we report the three-step convergent synthesis (two-step longest linear sequence) of a divalent exo-norbornene imide capable of efficient coupling with various nucleophiles and azides to produce diversely functionalized branched …
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Design of Cleavable Monomers and Cross-Linkers for the Synthesis of Degradable Polymer Architectures
… and brush-arm star polymers (BASPs) via ring-opening metathesis polymerization (ROMP). A brief introduction to the recent advances of bottlebrushes and related nanoarchitectures as a promising carrier platform is provided, followed by the current efforts to impart degradability within the …
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Amino acid N-carboxyanhydrides and polypeptides: Controlled polymerization, properties and applications
… Ph.D. research is to develop controlled/living polymerization techniques of α-amino acid N-carboxyanhydrides (NCAs) and synthetic polypeptides based materials. Polypeptides are a class of emerging biomaterials receiving increasing interests for various applications including drug delivery, gene …
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Conjugated polymer based materials via the incorporation of polymerizable units
… development of new CP based materials by block copolymerization and/or end-capping with polymerizable units. In Chapter 1, three different norbornene derivatives having phenylene-heterocyclic moieties were copolymerized with either norbornene or 7-oxanorbornene derivatives via ring-opening …
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Developing novel polymer architectures for applications In magnetic resonance imaging and self-assembly
… attention over the last several decades. As polymerization techniques become more sophisticated, it becomes possible to create polymeric architectures with increasing control over structure, molecular weight, and mass dispersity. Herein, ring-opening metathesis polymerization (ROMP) is paired …
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Designing Microporous Polymers for Separations
… influence of side-chain length and dispersity in ring-opening metathesis polymerization (ROMP) polymers with pore-generating side chains. Macromonomers with four discrete monodispersities are separated and polymerized to produce bottlebrush polymers with monodisperse side chains. Each bottlebrush …
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Aerogels as diverse nanomaterials
… and terminal acrylate bonds by free-radical polymerization. Lower density samples were flexible, while higher density samples were mechanically strong. Those results were dependent on the particle size and interparticle connectivity of skeletal framework, pointing to a nanoscopic origin for …
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Polymers containing calix[4]arenes and triptycenes : new syntheses, properties and applications
… linkages on lower rims are synthesized by the polymerization based on acetylenic coupling reaction. The conformation of calixarene monomers dictates the ability to produce the new polymers: the calix[4]arene monomers with a partial cone conformation produce high molecular-weight polymers while …
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Self-Condensing Ring-Opening Metathesis Polymerization
Ring-opening metathesis polymerization (ROMP) is a great tool for synthesizing polyolefin materials with different topologies, including hyperbranched polymers—polymers with high degrees of branching and many end groups. However, hyperbranched polymer synthesis via ROMP is challenging due to …
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Applications of ROMP Polymers
… programmable polymers (SPPs), was developed by ring-opening metathesis polymerization (ROMP) based on monomers containing recognition groups that display restricted rotation. We could modulate the binding properties of the SPPs by heating in polar or non-polar solvents (water/acetonitrile). The …
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Chemical Sensing of N-Nitrosodimethylamine and Methane
… some strategies to combat interferants during chemical sensing are dis-cussed. In Chapter 2, published work on a luminescent method to determine levels of N-nitrosamines is presented. This work involved the synthesis of five phosphines bearing N-heterocycles, followed by coordination with …
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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+)
… star polymers (BASPs) via the brush-first ring-opening metathesis polymerization (ROMP) method. A bis-norbornene acetal structure was identified that, when employed in conjunction with a poly(ethylene glycol) (PEG) macromonomer, provided highly controlled BASP formation reactions. …
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Accessing Model, Functional Polyolefins and Polyolefin Copolymers with Ring-Opening Metathesis Polymerization
… are challenging to synthesize using traditional polymerization methods. Ring-opening metathesis polymerization (ROMP) is a useful tool for achieving this goal as the catalysts are often tolerant to a wide range of functional groups, and the polymerizations are typically well-controlled making …
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I. Macromolecular and architectural effects on the polymerization of α-helices & II. Functional ROMP curing polyester thermosets
… array along a separate polymer scaffold, the polymerization was found to increase in rate even more substantially. The second part of my thesis focuses on a separate project altogether, sponsored by The Dow Chemical Company. This project focuses on the utilization of ring-opening metathesis …
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Development of novel polymeric nanoparticles with tailored architectures and functionalities/
… were synthesized by, first, "graft-through" ring-opening metathesis polymerization (ROMP) of a norbornene-macromonomer to create the brush-arms, and second, cross-linking the arms with a bis-norbornene cross-linker to afford star polymers via the "arm-first" star polymer method. Functionality …
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Efficient Synthetic Strategies for Discrete Macromolecules: Enabling Exploration of Structure-Property Relationships in Biological and Materials Applications
… After polymerizing these macromolecules using ring-opening metathesis polymerization (ROMP) to generate bottlebrush polymers with uniform arms, we evaluated their interactions with biological systems both in vitro and in vivo, which provide an optimized route for the design of future …
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Ring-opening Metathesis Polymerization for the Creation of Responsive Colloids and Surfaces
Ring-opening metathesis polymerization (ROMP) is a well-controlled living polymerization method and has been widely used to synthesize various polymer materials. This thesis investigates the use of ROMP in the creation of responsive materials, including photonic polymer colloids and …
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Design and development of Brush-Arm Star Polymers for applications in drug delivery
… In this thesis, BASPs are synthesized by ring opening metathesis polymerization (ROMP) of a norbornene functionalized PEG-based macromonomer to first form a living bottle-brush initiator. Next, a bifunctional norbornene crosslinker is added to the bottle-brush polymer to yield star …
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Solvent-based self-healing polymeric materials
… materials employed a room temperature ring-opening metathesis polymerization (ROMP) using encapsulated dicyclopentadiene (DCPD) and wax-protected Grubbs’ catalyst. However the limitations of this system, including catalyst availability, cost, environmental toxicity, stability, and …
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