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Showing 1 to 20 of 78 for “"microphase separation"”.
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Microphase Separation Studies in Styrene-Diene Block Copolymer-based Hot-Melt Pressure- Sensitive Adhesives
… melt. The work also focuses on determining the microphase separation mechanism in adhesive melts containing various amounts of low molecular weight resin (tackifiers) blended with styrene — diene block copolymers. To understand the correlation between adhesive morphology and their dynamic …
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Mesostructuring of SiCN Materials and Catalysts via Microphase Separation Technique utilizing High-Density Polyethylene Blocks
… (PEOPL) copolymer by microphase separation technique and selective etching of polylactide block.1H NMR was used to confirm the formation of copolymer. Atomic Force Microscopy (AFM) was used to analyse the microphase separated PEOPL copolymer. The progress of etching …
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Structure–Property Relationships Of: 1) Novel Polyurethane and Polyurea Segmented Copolymers and 2) The Influence of Selected Solution Casting Variables on the Solid State Structure of Synthetic Polypeptide Films Based on Glutamate Chemistry
… that are typically used to promote a microphase separated morphology that gives these materials their useful characteristics. Polyurethanes in which a single asymmetric diisocyanate comprising the whole of the hard segment were found to display poor microphase separation. Conversely, …
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Engineering properties of multiphase block copolymers
… of block copolymers is their ability to undergo microphase separation above a critical block length. Either one or two phase block copolymers can be prepared by controlling the molecular weights of the parent oligomers. In the bisphenol-A polycarbonate/bisphenol-A polysulfone system, for example, …
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Dynamics of liquids in porous media: Investigating competitive adsorption using NMR relaxometry
… to investigate competitive adsorption and microphase separation of liquid mixtures imbibed within porous media. The work was done on three different mesoporous catalysts and catalyst supports, namely anatase titania, γ-alumina and silica. The main NMR relaxometry method that was applied was …
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Improved filtration membranes through self-organizing amphiphilic comb copolymers
… fractionate small molecules by size through the microphase separation of the amphiphilic comb copolymers. This size scale corresponds to a "missing link" in the separations currently offered by commercial membranes. Such membranes formed by coating a porous support membrane with the comb …
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Synthesis and characterization of ammonium ionenes containing hydrogen bonding functionalities
… weight of polymeric precursors and induce microphase separation due to intermolecular associations. The influence of non-covalent interactions on structure-property relationships of ammonium ionenes were studied regarding mechanical (tensile, DMA), thermal (DSC, TGA), and morphological …
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Donor-Acceptor Block Copolymers for Charge Separation at Nanostructured Interfaces
… block copolymers. Block copolymers exhibit microphase separation with domain sizes on a nanometer scale by the interplay between immiscibility and molecular connectivity. I used a controlled radical polymerization technique, the nitroxide mediated radical polymerization (NMRP), to get block …
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Non-equilibrium phase separation in active matter
… complicated models within this class, including microphase separation, limit cycles and droplet splitting. To expand upon the systematic study of non-equilibrium reaction-diffusion systems, we also consider that the diffusive dynamics can break time reversal symmetry in its own right. This …
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Cell dynamical system approach to block copolymers
… a mesoscale model of block-copolymer (BCP) microphase separation dynamics based on a cell dynamics system (CDS) model. The model suggests a partial differential equation (PDE) model that allows us to find a close relation between the block copolymer and spinodal decomposition problems. A …
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Understanding the effect of protonation on the self-assembly of a model polyelectrolyte-neutral block copolymer
… vapor or liquid phase is also shown to induce microphase separation. This is followed by a thorough treatment of the bulk morphologies of POEGMA-P2VP as a function of acid content, temperature, and minority block volume fraction. For all diblocks, protonation is found to increase the …
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Using current sensing atomic force microscopy to study heterogeneous materials
… the sample surface. In experimental results, the microphase separation of block copolymer and the current passing through the ion channel in Nafion membranes are observed by CSAFM. This demonstrates that CSAFM is a powerful and important tool for studying heterogeneous materials.
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Liquid State Theory of Equilibrium Structure and Thermodynamics of Block Copolymer Melts and Solutions
… of collective structural properties related to microphase separation on polymer concentration, temperature, and other controllable variable is found. Qualitative and semi-quantitative comparisons with small angle x-ray and neutron scattering experiments on telechelic and multiblock copolymers …
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Bio-inspired Design and Self-Assembly of Nucleobase- and Ion-Containing Polymers
… triblock polymer architecture drove microphase-separation into a physically crosslinked hard phase in a low Tg matrix. Hydrogen bonding in the hard phase enhanced the mechanical strength and maintained processability of microphase-separated copolymers for thermoplastics and …
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Fundamental adhesive studies of block copolymers
… their adhesive properties. The structure of the microphase separated morphology of the materials studied was found to influence the adhesive behavior in applications as hot melt/structural type adhesives and as pressure sensitive adhesives. The thermal and the dynamic mechanical behavior of …
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Multiblock Copolymer Synthesis in Aqueous Heterogeneous Systems
… methyl methacrylate and styrene. Finally, the microphase separation of multiblock copolymers inside the particles is studied. The results demonstrate that the criteria for microphase separation in the particles is less stringent compared to the corresponding bulk system due to the orientation …
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Block Copolymer-derived Porous Polyimides and Carbon for High-Performance Energy Storage
… are featured with microstructures defined by the microphase separation of constituent blocks, enabling various applications in energy storage. Dictated by the molecular weights and volume fractions of constituent blocks, the microphase separation forms nanoscale microstructures of 1-100 nm. …
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Synthesis and Characterization of Cation-Containing and Hydrogen Bonding Supramolecular Polymers
… intermolecular associations and to induce microphase separation. The influence of non-covalent association on the structure/property relationships of these materials were studied in terms of physical properties (tensile, DMA, rheology) as well as morphological studies (AFM, SAXS). Ionic …
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Disentangle model differences and fluctuation effects in DPD simulations of diblock copolymers
… repulsions. In the original DPD simulations of microphase separation of diblock copolymer melts by Groot and Madden 2 , the simulation results were compared and found to be consistent with the phase diagram for the "standard model" of continuous Gaussian chains with Dirac δ-function interactions …
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The synthesis of nanoporous hydrogels using sacrificial block copolymers
… chemically distinct polymer blocks, inducing microphase separation to form a pattern on the scale of tens of nanometers, and finally removing one of the polymer blocks. The sacrificial block needs to be degraded easily and controllably and the blocks must self-assemble. Desired properties for …
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