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 15 of 15 for “"Poly(methyl acrylate)"”.
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The synthesis of amphiphilic diblock copolymers: An investigation into the formation of micelles as a function of hydrophobic block length
<p>Acrylate-based amphiphilic diblock copolymers show great potential for anti-cancer drug transport due to their ability to aggregate into protective core-shell micelles. Using RAFT polymerization, copolymers containing poly(acrylic acid) and poly(methyl acrylate) blocks were made with high …
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Polymer dynamics in bulk, adsorbed and solution by NMR methods
… resonance (²H NMR) study of bulk and adsorbed polymers. Segmental dynamics of poly(methyl acrylate) is examined in bulk and when adsorbed to anopore, alumina and silica as a function of temperature. The second part investigates diffusion of small molecules in polymer solutions by pulsed …
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Mechanophore-Linked Polymers for Studying Mechanochemical Response
… demonstrated that a mechanophore-linked polymer could be activated site-specifically via ultrasound-induced mechanical forces. Building on this idea, a method was established to synthesize mechanophore-linked poly(methyl acrylate) in an efficient manner using single electron transfer …
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Design of PolyMOCs and the synthesis of crosslinkers for the BASP platform
… integration of metal-organic cages (MOCs) into polymers were explored. The first strategy creates Block Co-PolyMOCs (BCPMOCs), which feature the integration of MOCs into block copolymers (BCPs). In the first assembly step, BCPs functionalized with a bispyridyl ligand on the chain end undergo Pd …
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Investigation of Copper Wire-Mediated Controlled/Living Radical Polymerization
Copper wire mediated controlled living radical polymerization (CLRP) is a powerful tool that provides numerous opportunities for the development of new materials. It requires low catalyst loading and mild reaction conditions, but does involve use of organic solvents. There is a need for greener …
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Effect of structure and plasticizer on the glass transition of adsorbed polymer
<p>"The effect of molecular mass on adsorbed poly(methyl methacrylate) (PMMA) on silica was determined using temperature-modulated differential scanning calorimetry (TMDSC). A two-component model, based on loosely-bound polymer (glass transition temperature, T<sub>g</sub>, similar to that of bulk) …
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Ensemble and single molecules fluorescence studies of polymers
… on the photo-oxidation and green emission of poly(9,9-dioctylfluorenyl-2,7-diyl) (PFO) are investigated at both single molecule and ensemble levels. Single molecule studies reveal the conformation of PFO chains to be more globular when cast from THF than from toluene. Intensity transients of …
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Mechanophore activation at heterointerface and surface crowdedness as a determining factor
"When bringing ""mechanical force"" and ""polymer"" into conversation, one might naturally relate to everyday scenarios such as worn cloth, broken taillight and cracked paint. The intuitive viewpoint reflects the historic consensus that mechanically induced chemical changes are destructive. …
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Well-defined molecular brushes: Synthesis by a "grafting through" strategy and self assembly into complicated hierarchical nanostructures
… is achieved by combining orthogonal living polymerization techniques rationally, such as living/controlled radical polymerization, ring opening polymerization and ring opening metathesis polymerization. Generally, the strategy can be divided into two steps: the first step involves the …
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Polymer architecture effects on mechanochemical reactions
Long chain polymers have a unique ability to become highly extended in elongational flow fields. The forces developed along the backbone give rise to scission of the chains near their center. Recently, this unique property of polymers has been adopted to explore new chemical transformations by …
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Synthesis and Characterization of Tailored Photoactive Macromolecules
… cinnamate derivatives were positioned as either polymer chain ends or side groups to synthesize photoactive macromolecules and gain the ability to reversibly control molecular weight and crosslink density using UV light. The cinnamates and coumarins were reacted onto the polymers via multiple …
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Modification of a microbial co-polyester by graft copolymerisation
… was to introduce specific properties in to a polymer required by the sponsor company, Bonded Fibre Fabric, namely appropriate thermal characteristics coupled with biodegradability. Microbial polyesters are biodegradable, but no commercial grade was available that met the required thermal …
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Mechanical and optical characterization of force induced chemical reactions in solid state linear polymers
… chemical species (mechanophores) into polymer backbones, mechanical force can drive chemical reactions. Mechanophores have been developed with potential as damage sensing, self-healing, and self-reinforcing materials. This research investigates the conditions for promoting mechanophore …
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Control of mechanochromic reactions in a polymer matrix
… and recently developed naphthopyran (NP), in polymeric matrices. First, the effect of force on the rate constants and activation energies for SP–merocyanine (MC) transition is characterized in bulk polymers. Under different values of a macroscopic tensile stress, the change in fluorescence …
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Spiropyrans as color-generating mechanophores
… reaction products and smart materials such as polymers that response to mechanical stimuli. Mechanically responsive polymers are already known, but they generally rely on the disruption or formation of non-covalent bonds. Expanding their scope to include covalent bond changes in force-sensitive …