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 13 of 13 for “"bond exchange"”.
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Bond exchange reactions in high temperature thermoset polymers
In this work, we examine the use of exchangeable bonds within an all-aromatic thermoset to enable reversible bonding towards potential utility as an adhesive for in-space assembly. Interchain transesterification (ITR) is a type of bond exchange reaction accessible by polymers possessing ester …
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An examination of the price reaction to the announcement of bond issues by Johannesburg Stock Exchange listed companies on the Bond Exchange of South Africa
… on the daily stock returns of Johannesburg Stock Exchange (JSE) listed companies, on The Bond Exchange of South Africa (BESA), during the period 2000 to 2008. The study is an event study that uses the market model to generate expected returns. The average abnormal returns are standardised by their …
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Water dynamics about selected monosaccharides in solution
… are able to simultaneously form hydrogen bonds as donors and acceptors and thus have unique properties as solvent molecules. These properties influence how water interacts with solute molecules. The mechanism of hydrogen bond exchange plays a role in the hydration of solute molecules. A …
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Structure-property relationships from molecular simulation of polymeric matrix composites
… molecular dynamics simulation methodology for bond exchange reactions and dissolution in covalent adaptable networks interacting with ethylene glycol solvent. Increasing the rate of bond exchange reactions was found to increase both dangling end intradiffusion and ethylene glycol …
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Liquid Crystalline Elastomers as Renewable Functional Materials: From Chemistry to Application
… this PhD, the understanding and control over the exchange dynamics of xLCEs was still lacking, stemming in part from a need for a broader library of materials with a greater variety of dynamic properties. Additionally, the field suffered from a lack of LCE applications geared towards addressing …
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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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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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Three Essays On Bond Trading
In Part 1, we study the impact of bond exchange listing in the US publicly traded corporate bond market. Overall, we find that listed corporate bonds have lower bid-ask spreads than unlisted corporate bonds. We specifically show that listed bond spreads are $0.14 lower than unlisted bond spreads. …
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The Economics of Corporate Bankruptcy Law
… often been argued that the coercive character of bond exchange offers leads to an inefficient liquidation policy, and that legal regulations are called for. In contrast to this claim, it will be argued here that such bondholder coercion will be anticipated when contracts are written out, so that …
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Design and Synthesis of Polymer Networks and Branched Polymers for Triggered Deconstruction of Self-Assembly
… observations. Next, we show that by facilitating bond exchange rather than cleavage, direct reprocessing of permanently crosslinked thermosets is achieved. We report the first example of self-healing pDCPD, in addition to the first reported Si-O exchange of bifunctional silyl ethers, consequently …
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Design and characterization of aromatic thermosetting copolyester resin for polymer matrix nanocomposites
… functional groups, which establishes covalent bonding with cure advancing crosslinking polymer network and modifies the glass transition region characteristics. The aromatic resin forms an interfacial liquid crystalline mesophase domain around graphene nanoplatelets, which uniquely displays a …
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Shockwave energy dissipation by mechanoresponsive materials
… networks (PDMS-B-DR) containing boronic ester bonds, which allows self-healing via reversible bond exchange reactions are studied. By increasing the density of boronic ester bonds in PDMS-B-DR, lower peak pressures are measured, and its energy absorption capability outperforms covalent PDMS and …
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Development of applications of liquid crystalline elastomers from Materials to Applications
… the third generation of LCE utilised the bond-exchange behaviour in vitrimers to produce exchangeable LCE (xLCE), which enabled post-polymerisation alignment, welding and recycling of LCE. Stemming from such unique network structures and a wide range of synthetic chemistries, LCEs have a …