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Showing 1 to 20 of 51 for “"Norbornene"”.
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Thiol-Norbornene Hydrogels With Tunable Mechanical Properties for Engineered Extracellular Matrices
… horseradish peroxidase (HRP) to crosslink thiol-norbornene hydrogel and use mushroom tyrosinase (MT) to create secondary DOPA-dimer crosslinks that stiffened the hydrogel. The cytocompatibility of HRP-mediated thiol-norbornene gelation and the effect of stiffening on cell fate was evaluated. The …
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Characterizing Mechanical and Gas Transport Properties of Nitrile Norbornene (NN) ROMP in Preparation for Analysis of OMe-NN-ROMP Block Copolymers
… and gas transport properties of nitrile norbornene ROMP. At a concentration of 0.15 M, the nitrile norbornene was able to successfully ROMP without becoming gel-like allowing for further characterization. The number average molecular weight was found to be 155 kDa with a polydispersity of …
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Conjugated polymer based materials via the incorporation of polymerizable units
… units. In Chapter 1, three different norbornene derivatives having phenylene-heterocyclic moieties were copolymerized with either norbornene or 7-oxanorbornene derivatives via ring-opening metathesis polymerization (ROMP). Block copolymers' stabilities and solubilities could be …
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Development of Self -Healing Polymer Composites and Photoinduced Ring -Opening Metathesis Polymerization
… (PROMP) is demonstrated. Polymerization of norbornene and dicyclopentadiene has been performed, showing the simplicity and ease of this procedure. The resulting poly(norbornene) shows high trans content (85%) of the ring opened double bonds. Crosslinked poly(dicyclopentadiene) can be …
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Metal-Free Photoredox-Mediated Ring Opening Metathesis Polymerization
… milder oxidants, achieved higher conversions of norbornene in MF-ROMP, with thiopyrylium salts out-performing corresponding pyrylium salts in both rate and conversion. While 2,4,6-tris(4-methoxyphenyl)pyrylium tetrafluoroborate had been the workhorse for research to date, the corresponding …
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Development of novel polymeric nanoparticles with tailored architectures and functionalities/
… 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 can be installed into the macromonomer (MM) or …
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Synthetic strategies for control of structure from individual macromolecules to nanoscale materials to networks
… micelles for drug delivery were made from norbornene based poly(ethylene glycol) macromonomers with covalently linked drugs. A total of five macromonomers were made using three different drugs (telmisartan, paclitaxel, and SN-38) and three different drug loadings. Combinations of these …
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Molecular Encapsulation in Kinetically Trapped, Hydrogen-Bonded Pyrogallolarene Hexamers
… biphenyl, fluoranthene, fluorene, naphthalene, norbornene and pyrene were performed in multiple solvents using <sup>1</sup>H NMR. In all but one case the kinetically stable complexes completely exchanged the encapsulated guest for solvent resulting in guest release processes that were determined …
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Studies on the synthesis and the transport properties of organic materials
… Monomers having methacrylate, styrene, and norbornene moieties have been synthesized and their hole mobilities measured. Adding a methacrylate or norbornene moiety had no effect on the hole mobility. The mobility of the norbornene polymer was significantly higher than the methacrylate …
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Synthesis and Characterization of Multi-Component Polymeric Materials Prepared via Free Radical Polymerization
… and composition of maleic anhydride (MAH), norbornene (Nb), and tert-butyl 5-norbornene-2-carboxylate (NbTBE) terpolymers were investigated. Pseudo first order kinetic analysis using in situ FTIR indicated that the observed rate of reaction was a strong function of the Nb/NbTBE ratio with a …
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Lanthanide luminescence in Pybox functionalized metallopolymers
… the polymer backbone. A Pybox-derivative with a norbornene para-functional group sensitized the emission of Eu(III) and Tb(III) in near equal efficiencies. This monomer was copolymerized with DCPD and norbornene, also showing that the quantum yields were influenced by coordination site ratios to …
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Synthesis of derivatizable semiconductor nanocrystals through rational ligand design, and applications thereof
… in that manner. The first ligand exhibits a norbornene functional group and binds strongly to the surface of colloidal nanocrystallites during particle synthesis, eliminating the need for ligand exchange and enabling large-scale production of high quality derivatizable nanomaterials. This …
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Design and development of Brush-Arm Star Polymers for applications in drug delivery
… 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 polymers with a crosslinked-core and bottle-brush polymer …
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Syntheses of biocompatible luminescent nanocrystals for visible and short-wave infrared imaging applications
… to the established QD synthesis, producing norbornene functionalized QDs that can be readily phase transferred into water via norbornene/tetrazine click chemistry, meanwhile allowing flexible functionalization of the QDs by incorporating a functional group on the hydrophilic chain. This …
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Supported catalysts, from polymers to gold nanoparticles supports
… The polymer chosen for the study is poly(norbornene), and the catalyst is a 1,3-disubstituted benzene ligand with sulfurs in the side-chains able to chelate to the metal center, better known as pincer ligand. These ligands are abbreviated by the three atoms that coordinate to the metal …
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Ru-mediated ring-opening metathesis polymerization for the synthesis of complex polymer architectures
… some monomer classes, most commonly substituted norbornenes. The high livingness of ROMP makes it well-suited for the synthesis of complex polymer architectures (e.g., bottlebrush polymers, star polymers, and (multi)block copolymers, among others). However, compared to other living …
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Bottlebrush and related polymer architectures for biomedical applications
… longest linear sequence) of a divalent exo-norbornene imide capable of efficient coupling with various nucleophiles and azides to produce diversely functionalized branched macromonomers optimized for ring-opening metathesis polymerization (ROMP).
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Development of fluorescent semi-conductor nanocrystal conjugates for in vitro and in vivo imaging applications
… traditional conjugation methods, tetrazine-norbornene cycloaddition benefits from the non-interacting properties of the functional groups to the QD surface, and yields the high conjugation efficiencies on QDs. In addition, the rapid kinetics, absence of catalyst, and bio-orthogonality of the …
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Molecular and Polymeric Materials Based On Asymmetrically Substituted BF2 3-Cyanoformazanates
… copolymers, where the comonomer was an organic norbornene derivative. Spectroscopic studies of these polymers revealed that, as the mole fraction of BF2 (ƒBF2) in random copolymers decreased, the quantum yield of fluorescence increased; this was due to less quenching/self-absorption from nearby …
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Infrared Laser Excitation and Fluorescence Spectra: A Study of Intramolecular Vibrational Energy Relaxation
… molecules varying in size from methane to norbornene. Included are aliphatic hydrocarbons, aromatic molecules, ethers, and ketones, including cyclic molecules. The rate of resonance fluorescence, calculated relative to a non-relaxing molecule was used as the criterion of relaxation. Small …
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