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 12 of 12 for “"Shape-persistent"”.
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Carbon-carbon bond formation methods for the preparation of shape-persistent architectures
Carbon-rich, conjugated organic scaffolding is a popular basis for functional materials, especially for electronic and photonic applications. However, synthetic methods for generating these types of materials lack diversity and, in many cases, efficiency; the insistence of investigators focusing on …
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Polymers for electronics and chemical sensing applications
The incorporation of molecular structures such as shape persistent molecular frameworks, strong hydrogen bond donor groups or perfluoro-alkyl groups can result in considerable gains in the performance of some established polymeric materials. This dissertation details the synthesis and properties of …
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Plumbing the Depths of the Shallow End: Exploring Persistent Homology Using Small Data
<p>Persistent homology is a prominent tool in topological data analysis. This thesis is designed to be an introduction and guide to a beginner in persistent homology. This comprehensive overview discusses the math used behind it, the code needed to apply it, and its current place in the field. We …
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Multilayered supramolecular structures: Two-dimensional polymers and polar assemblies
… assemblies yield 2D polymers which should be shape-persistent plate-like molecules. Isolated 2D polymers are stable up to 320$\sp\circ$C, which is at least 143$\sp\circ$C higher than the isotropization temperature of their precursor monomer.
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Nanofiltration membranes modified with aromatic polyamide dendrimers active layers
… commercial TFC-S nanofiltration membrane with shape-persistent dendritic architectures. Amphiphilic aromatic polyamide dendrimers (G1-G3) are synthesized via a divergent approach and used for membrane modification by direct percolation. The permeate samples collected from the percolation …
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Search and Optimization of Supramolecular Systems
… to covalently stitch molecular aggregates into shape-persistent macromolecules referred to as molecular object polymers. This simulation can give a useful indication of how successful a proposed system might be, or in assessing the degree of reaction in known systems required to account for …
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I. Depolymerization-macrocyclization of (o-phenylene-ethynylene)-alt-(arylene-ethynylene) copolymers II. Improving existing water filtration membranes via covalent modification
… Copolymers The synthesis of shape-persistent arylene-ethynylene macrocycles via alkyne metathesis remains an open area of investigation due to gaps in understanding about how monomer structure affects product distribution. In our efforts to close this gap, we studied how …
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Synthetic and mechanistic studies to expand the scope of alkyne metathesis dynamic covalent chemistry
… applied reactions for the synthesis of shape-persistent molecular architectures via DCC. The scope of alkyne metathesis DCC has been rapidly expanding thanks to the development of increasingly active and functional group tolerant catalyst systems and is thus attractive as a method to …
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Polycyclic Aromatic Hydrocarbon (PAH)-Based Conjugated Macrocycles and Polymers For Electronic Applications
… applications. Specifically, two imine-based shape-persistent macrocycles containing triphenylene building blocks have been synthesized. Their stable conformations are predicted by quantum mechanical calculations and confirmed by 2D NOESY NMR measurements. Compared to their corresponding …
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Design and synthesis of organic chromophores for imaging, lithography and organic electronics
… to a thermal emulsion polymerization to yield shape-persistent, water-soluble chromophore nanoparticles. Perylene and terrylene diimide derivatives containing either two or four phenyl TFVE functional groups were synthesized and subjected to thermal emulsion polymerization in tetraglyme. …
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Structural Analysis of Cylindrical Particles by Small Angle X-ray Scattering
… scattering (SAXS). Three systems with cylinder-shaped particles: (1) Laponite particles in aqueous solutions, (2) Poly(carbon suboxide) particles in binary water/DMF solutions, and (3) Suprastructural aggregates of coil-ring-coil block copolymers in cyclohexane, have been studied by SAXS …