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Showing 1 to 20 of 303 for “"block copolymer"”.
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Block copolymer photonic crystals
This thesis explores the photonic properties of block copolymer systems. One dimensionally periodic dielectric stacks are fabricated with symmetric, lamellar forming, copolymer systems: diblock copolymers, solvent swollen BCP materials, and homopolymer swollen BCP blends. Each system exhibits …
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Deformation behavior of cylindrical block copolymer bicrystals : pathway to understanding block copolymer grain boundaries
… styrene-isoprene-styrene (SIS) cylindrical block copolymer (BCP), produced by a roll-casting process; yield various types of pure tilt grain boundaries. The study of the deformation of the bicrystals, each containing one grain boundary, enables a deeper understanding of the influences grain …
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Mesoscale modelling of block copolymer systems
… a set of physical phenomena occurring in various block copolymer systems and trying to understand them by means of computer simulation. In the course of the work Cell Dynamics Simulation (CDS) was implemented as a computer program and further developed when necessary. The choice of CDS is due to …
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Block Copolymer Formation by Transformation Reactions
… show that the resultant products contain copolymers of polycyclopentene/polystyrene and therefore demonstrate the importance of the role played by the cocatalyst in metathesis reactions. Model compound studies suggest that the metallocarbene initiator is formed by an alpha hydrogen …
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Computation by block copolymer self-assembly
… to solve classically. In this thesis, we use block copolymer self-assembly, a well-studied phenomenon in polymer science, to develop a new approach to computing by applying directed self-assembly to implement Ising-model-based computing systems in materials. In the first part of the thesis, we …
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Shear-induced alignment in block copolymer solutions
The alignment of the ordered microdomains of block copolymers in solution has been accomplished by using mechanical shear fields. Two pathways to monitore the achievement of aligned structures have been used: rheo-optical and in situ rheo-SAXS methods. The AC diblock copolymer and ABC triblock …
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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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Magnetic nanostructures patterned by block copolymer lithography
… patterning magnetic films using self-assembled block copolymer masks and examining the magnetic reversal mechanisms of as deposited and patterned magnetic films. Ti / Co 66 at. % Cr 22 at. % Pt 12 at. % (CoCrPt) films with perpendicular magnetic anisotropy were deposited on silicon wafers by UHV …
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Block copolymer self-assembly and templating strategies
Block copolymers microphase separate to form periodic patterns with period of a few nm and above without the need for lithographic guidance. These self-assembled nanostructures have a variety of bulk geometries (alternating lamellae, gyroids, cylinder or sphere arrays, tiling patterns, core-shell …
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Commercial applications of block copolymer photonic gels
Block copolymer photonic gels are a simple and easily processed material which responds rapidly to environmental stimuli through a color change. The diblock copolymer that forms the gel self-assembles into a lamellar structure that has the potential to reflect light over a broad range of …
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Block copolymer characterization by gel permeation chromatography
… weight distribution, on the other hand, for block copolymers. The technique selected to determine this kind of information was Gel Permeation Chromatography, because, since its introduction in 1964, it has become the most powerful tool for the rapid characterization of homopolymers. The …
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Structure Formation Mechanism of Isoporous Block copolymer Membranes
… separation of poly(styrene-b-vinylpyridine) block copolymers in highly concentrated solutions induced by evaporation of a binary solvent mixture of a high and low boiling solvent. During self-assembly and non-solvent induced phase separation by immersion in water, asymmetric membranes …
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The tear behaviour of some tri-block copolymer elastomers.
Four SBS block copolymers were subjected to extensive chemical examination to determine block molecular weights and styrene fractions.Casting from different solvent systems into sheet form resulted in a range of microstructural formations for the normally dispersed styrene phase. These …
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Understanding Elastin-Like Polypeptide Block Copolymer Self-assembly Behavior
… where X is any amino acid except proline. ELP diblocks have been engineered by creating two ELP blocks with hydrophilic and hydrophobic guest residues. The hydrophobic block desolvates at a lower temperature and forms the core of a micelle while the still hydrated hydrophilic block forms the …
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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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Fabrication of nanoscale magnetic domains using block-copolymer lithography
… etch contrast between PS and PDMS makes the block copolymer ideal for creating patterns that can be transferred onto magnetic media. The aim of this study was to determine optimal BCP film thicknesses that produce spherical micro-domains with long range order on a Co substrate brushed with …
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Block copolymer self-assembly : lithography, magnetic fabrication, and optimization
Block copolymer (BCP) self-assembly is attractive because it provides nanoscale long-range ordered structures in a massive quantity. The capability of generating features with size as low as 5 nm is of particular interest in semiconductor fabrication since current photolithography has reached its …
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Effect of Encapsulated Species on Block Copolymer Micelle Self-Assembly
Due to their amphiphilic nature, block copolymers spontaneously form assemblies known as micelles in selective solvents. Minimization of the solution free energy drives the micellization process, with contributions from the polymer chains, surrounding solvent, and any additive molecules. Through …
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