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 30 for “"dynamic covalent"”.
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Tunable viscoelasticity, morphology, and charge transport of dynamic covalent polymers
Dynamic covalent bonds are reversible chemical linkages, enabling materials to undergo bond rearrangements in response to external stimuli. This dynamic behavior has led to the emergence of vitrimers that retain network integrity while exhibiting flow at elevated temperatures via associative bond …
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Folding-Driven Synthesis of Dynamic Covalent Oligomers Joined by Imine Linkages
The incorporation of folding features into the imine oligomers increases the kinetic stability under hydrolysis conditions by burying the labile imine bond. The imine bond in the imine dodecamer shows an order of magnitude longer half-life compared with the imine tetramer. The folding process could …
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Advances in the Synthesis and Application of Dynamic Covalent Polymer Networks
… the advantages of the two categories and create "dynamic plastics" by implementing reversible chemical bonds between polymer chains (crosslinking bonds) to make a 'transient' polymer network. Without activation of the chemical bond, the dynamic plastics behave like typical thermosets that have …
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Computational tools for materials design: applications in dynamic covalent chemistry, polymers, and electrochemical systems
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01
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Synthetic and mechanistic studies to expand the scope of alkyne metathesis dynamic covalent chemistry
Dynamic covalent chemistry (DCC) is a widely applied method for the synthesis of diverse molecular architectures and chemical libraries which are of broad interest in a number of chemical disciplines. As part of the greater subset of molecular self-assembly processes, DCC allows for the assembly of …
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Design of advanced biobased photocurable formulations: from dynamic covalent network to composite scaffold for tissue engineering
L'abstract è presente nell'allegato / the abstract is in the attachment
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Investigating the effect of dynamic covalent bonds on the crystallization, rheology and molecular relaxation in ethylene vitrimers
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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The Solid Phase Synthesis of M-Phenylene Ethynylene Oligomers and Its Application to the Synthesis of Covalent Molecular Ladders
… of forming large 2D grids through the use of dynamic covalent chemistry we first targeted the self-assembly of complimentary oligomers into [n]-rung ladders. We chose to employ imine formation as a chemical cross-link to capitalize on the self-correcting benefits of dynamic covalent chemistry …
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Liquid Crystalline Elastomers as Renewable Functional Materials: From Chemistry to Application
… alignment techniques. The introduction of dynamic covalent chemistry into the networks of LCEs (to form xLCEs) was a significant breakthrough in the field, promising enhanced material processing and sample alignment. However, at the outset of this PhD, the understanding and control over the …
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Understanding reaction pathways leading to tetrahedral organic cages via alkyne metathesis
… of constructing various POCs via multitopic dynamic covalent chemistry (DCC) has been demonstrated. The common view of successful DCC syntheses is that they proceed reversibly, ultimately allowing “error-correction” to provide thermodynamically favored products. The current approach to …
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Hindered urea bond for the design of dynamic materials
Dynamic covalent bonds (DCBs) featuring reversible bonding/debonding properties have found various applications in dynamic materials designs such as self-healing, malleable, shape-memory or environmentally-adaptive materials. However, most DCBs developed so far require either catalyst or harsh …
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The design and synthesis of organic chromophores for Faraday rotation and photoluminescence
… class of polyarylene chalcogenides. We utilized dynamic covalent SNAr behavior to demonstrate selective depolymerization. In addition, we studied the mechanism of the bright photoemission, ascribing it to delayed fluorescence enabled by the presence of sulfur atoms. In Chapter 5, we discuss the …
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Nitrosoarenes: magnetic anisotropy, donor-acceptor bonding and host-guest chemistry
… form in the solid state, thus yielding a dynamic covalent bonding reaction for this class of compounds. One area of our studies focuses on the very large (2-3 ppm) magnetic anisotropy of the nitroso group, which is evaluated for a series of ortho-substituted nitrosoarenes. The nitroso …
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Design and development of stimuli-responsive materials: pH sensitive polymersomes and poly(olefin sulfone)s
… parts: 1) the development of acid-triggerable covalently-crosslinked polymersomes and 2) the design and synthesis of base-, heat-, and fluoride-sensitive poly(olefin sulfone)s. Polymersomes are a useful approach for encapsulation but are susceptible to environmental stressors and leakage. By …
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Effects of shape, conformation, and symmetry on macrocycle synthesis via alkyne metathesis
… mixtures and low yields of a desired macrocycle. Dynamic covalent chemistry (DCC), specifically alkyne metathesis, was used to elucidate and probe the structural parameters that favor efficient macrocycle synthesis, because it involves rapid, reversible reactions under thermodynamic control, …
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Reversible Directed Phase Transfer of M4IIL4 and M4IIL6 Cages
… from each other in the manner of vesicles. These dynamic architectures are synthesised by self-assembly, which involves the simultaneous formation of multiple coordinative and dynamic covalent linkages during the same overall synthetic process. Their shape and binding properties can be tuned by …
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Design and Synthesis of Polymer Networks and Branched Polymers for Triggered Deconstruction of Self-Assembly
… plastics which are held together by permanent covalent crosslinks–thermosets, which make up 20% of all plastics–cannot generally be reprocessed or broken down. Generalizable strategies for the deconstruction and/or reprocessing of thermoset materials are therefore severely lacking and highly …
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Templated synthesis of synthetic oligomers
… incompatibility between the chosen H-bonding and dynamic covalent base pairs. Previously, a family of oligotriazoles equipped with phenol and benzoic acid recognition units was developed in the Hunter group, and shown to be capable of sequence information transfer by covalent templated synthesis …
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