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 58 for “"triblock copolymer"”.
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Hierarchical layered-silicate-- lamellar triblock copolymer nanocomposites
… layered-silicates in a styrene-butadiene-styrene triblock copolymer (SBS) as a function of layered-silicate dispersion during deformation was investigated. Predominantly immiscible composites of mixed morphology provided the initial proof that dramatic alteration of the SBS deformation behavior …
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Kinetically Controlled Synthesis of Triblock Copolymer Stabilized Gold Nanoparticles
… from tetrachloroauric(III) acid (HAuCl4) using triblock copolymers (TBPs). However, a major challenge of using TBPs is the heterogeneous nature of the formed nanocrystals. Establishing control over AuNP size and shape requires a detailed mechanistic understanding of precursor reduction and …
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Large strain deformation behavior of oriented triblock copolymer cylinders
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1997.
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Self-assembly of silicon-containing triblock copolymer and terpolymers
The block copolymer (BCP) self-assembly has garnered significant interest due to its ability to generate periodic nanostructures with a variety of morphologies. Compared to diblock copolymers that have been extensively studied to form the conventional morphologies such as spheres, cylinders, and …
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Studies of kinetic glass transition in a triblock copolymer micellar system
If a liquid is cooled sufficiently below the melting point, it becomes metastable with respect to the crystalline state. However, if nucleation is suppressed, one can supercools the liquid without resulting in crystallization. The characteristic time for structural relaxation increases rapidly and …
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Crystallization and melting behavior of (ε-caprolactone)-based homopolymer and triblock copolymer
… was compared and contrasted to that of a triblock copolymer containing (ε-caprolactone) blocks.
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Morophology and mechanical behavior of oriented blends of styrene-isoprene-styrene triblock copolymer and mineral oil
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1997.
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Development of Random Triblock Copolymer Based Nanoparticulate Formulation for Sustained Release of Macromolecules/Biologics in Treatment of Posterior Segment Ocular Diseases
Random triblock copolymers (RTB) were successfully synthesized by ring opening copolymerization method. RTB copolymers are composed of FDA approved materials such as polyethylene glycol (PEG), glycolide (GA), lactide (LA) and ɛ-caprolactone (CL). RTB copolymers were synthesized and developed for …
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The synthesis, characterization and catalytic applications of mesocellular silica foams
… mesocellular silica foams (MCF) by using triblock copolymer (PEO-PPO-PEO, Pluronic) micelles to template the formation of silica from tetraethoxysilane precursors. The combination of the polymer amphiphile with a hydrophobic swelling agent (such as trimethylbenzene) resulted in larger pore …
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Engineered Vesicles for Perchlorate Degradation
… dismutase enzymes were encapsulated in a triblock copolymer vesicle functionalized with the outer membrane porin OmpF. The porin allows for perchlorate transport into the vesicles, inside which the encapsulated enzymes transform perchlorate to chloride. Perchlorate reduction was quantified …
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Controlling morphology of multi-component block copolymer based materials
The ability of block copolymers to self-assemble into ordered microstructures has attracted much interest both from a pure scientific perspective and for their potential in numerous industrial applications. The microphase separation of block copolymers has been successfully exploited in a wide …
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Synthesis and Environmental Applications of Mesoporous Alumina
… oxide)-poly(butylene oxide)-poly(ethylene oxide) triblock copolymer and aluminum isopropoxide in the presence of nitric acid. This synthesis afforded mesoporous alumina materials with high specific surface area, large pore volume, and large pore width. This study showed that the specific surface …
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Structure-property relationships in novel ionomers
… restriction of chain motion by the ionic domain. Triblock copolymer ionomers from t-butyl methacrylate (tBMA) end blocks and polybutadiene or tapered poly(styrenelbutadienel styrene) (tSBS) mid blocks exhibit complex SAXS patterns indicating dispersed spheroidal ionic end block domains in the …
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Block copolymer Ion gels for CO2 Separations
Block copolymer ion gel is composed of a polymer network formed by self-assembly of triblock copolymers, and an ionic liquidIn this thesis project, the target is to study the gas separation performance of ion gels for CO2 separation, and seek ways to optimize their properties in terms of the gas …
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Effets des agents interfaciaux copolymères tribloc sur le comportement en rupture et en écoulement du mélange de polystyrène/caoutchouc-éthylène-propylène
In a previous study two triblock copolymers of styrene/ethylene - butylene/styrene (SEBS), of different molecular weights, were used to compatibilize a blend of 80 volume % of polystyrene (PS) and 20 volume % of ethylene - propylene rubber (EPA). The aim of this work is to foster the understanding …
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Studies of polymers in fouling release coating science
… two, we conducted phase related studies of a triblock copolymer, PEO400- PBO55-PEO400 in aqueous solution. The phase diagram features of PEO400-PBO55-PEO400 in water are compared with those of F127. We believe the lack of a lower gel to liquid transition boundary in this system is because of …
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Soft matter in motion: from actin to active emulsions
… actin, liquid crystal droplet and block copolymer to study their dynamics under equilibrium and non-equilibrium conditions. By following the motion of filamentous actin under a fluorescence microscope, we directly observed a width-varying confinement tube in an entangled solution and its …
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Electrochemical water technologies for resource recovery using polymer electrolytes
… Then, a family of highly tunable anion exchange triblock copolymers were designed and their tunability demonstrated in electrodialysis and single-cell anion exchange membrane water electrolysis (AEMWE). First, coupling of electrochemical struvite precipitation with hydrogen production was …
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The synthesis of nanoporous hydrogels using sacrificial block copolymers
… networks (nanoporous hydrogels) using block copolymers and to understand their transport properties. Nanoporous materials are synthesized by connecting two or more chemically distinct polymer blocks, inducing microphase separation to form a pattern on the scale of tens of nanometers, and …
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Flexible and Versatile Soft Templates for Mesoporous Silicas and Organosilicas Based on Pluronic Block Copolymer Surfactants and their Mixtures
… and organosilica nanotubes and nanospheres using triblock copolymer surfactants and their mixtures in the presence of a swelling agent. The introductory section, Chapter 1, will address the current state of the tunability of single-micelle-templated silica and organosilica nanotubes and will …
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