Valeriy Ginzburg | The Dow Chemical Company (original) (raw)
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Papers by Valeriy Ginzburg
Journal of Polymer Science Part A: Polymer Chemistry, 2014
ABSTRACT Polyester seed-oil derived polyols have been prepared and blended with conventional poly... more ABSTRACT Polyester seed-oil derived polyols have been prepared and blended with conventional polyols for making polyurethane elastomers. Miscibility was complete for polypropylene oxide/polyethylene oxide and polytetramethylene oxide (PTMEG). Blends of polyester seed-oil derived polyols with conventional polyester polyols (polybutylene adipate and ɛ-polycaprolactone) were immiscible or nearly so. Furthermore, the phase behavior (miscible vs. immiscible) did not change appreciably for each blend composition explored as a function of temperature at relevant ranges (up to the polyether ceiling temperature). This counter-intuitive result is found to be actually consistent with calculated solubility parameters for each polyol type and the phase diagrams computed on their basis. The phase behavior of the polyols is shown to have significant effects on the properties of polyurethane elastomers where immiscible polyols cause broadening of the glass transition distribution and significant reduction of ultimate tensile properties. However, here it is shown that immiscible systems containing polyester seed-oil derived polyols can be transesterified with the appropriate polyol partner of interest to create a new single phase polyol or that the polyester polyol monomers can also be copolymerized to make new single phase polyols, both of which result in improved polyurethane elastomer properties. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014
Polymer, 2002
We develop a coarse-grained model to investigate the in¯uence of nanoscale particles on the phase... more We develop a coarse-grained model to investigate the in¯uence of nanoscale particles on the phase separation and the morphology of symmetric AB diblock copolymer melts. The microphase separation is modeled by the cell dynamical systems (CDS) equations, while the particle dynamics is described by a Langevin equation. We assume that the particles have a selective af®nity to the A block and thus, can selfassemble and form clusters within A-domains. By varying the particle volume fraction, f p , we study the coupling between the microphase separation of the diblocks and the cluster formation for the particles. We also estimate the percolation threshold, f p , for the particles and ®nd that the presence of diblocks decreases f p by a factor slightly greater than two relative to the case of particles in a homopolymer (f p < 9% in a diblock vs. 22% in a homopolymer). This result can be useful in designing new composites with increased electrical conductivity and/or mechanical strength. q
ACS Symposium Series, 2001
ABSTRACT
Advances in Patterning Materials and Processes XXXI, 2014
ABSTRACT
Polyolefin Composites, 2007
ABSTRACT Introduction Nanocomposite Morphology, Thermodynamics, and Phase Behavior Nanocomposite ... more ABSTRACT Introduction Nanocomposite Morphology, Thermodynamics, and Phase Behavior Nanocomposite Rheology and Dynamics Prediction of Nanocomposite Properties Conclusions Acknowledgment Nomenclature References
Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 1999
We develop a mean-field rate-equation model for the kinetics of phase separation in binary mixtur... more We develop a mean-field rate-equation model for the kinetics of phase separation in binary mixtures with hard mobile impurities. For impurities preferentially wet by one of the components, the phase separation is arrested in the late stage. The "steady-state" domain size depends strongly on both the particle diffusion constant and the particle concentration. We compare theoretical results with the simulation data and find good qualitative agreement.
Journal of Photopolymer Science and Technology, 2013
Alternative Lithographic Technologies V, 2013
ABSTRACT Directed self-assembly (DSA) of block copolymers (BCPs) is a promising technology for ad... more ABSTRACT Directed self-assembly (DSA) of block copolymers (BCPs) is a promising technology for advanced patterning at future technology nodes, but significant hurdles remain for commercial implementation. The most widely studied material for DSA is poly(styrene-block-methyl methacrylate) (PS-PMMA), but the relatively weak segregation strength of PSPMMA results in some limitations. This paper reports on these limitations for PS-PMMA and highlights a path to success through use of more strongly segregated "high-χ" block copolymers. In general, stronger segregation is predicted to lower defectivity at equilibrium, but unfortunately, kinetics of self assembly also becomes much slower as segregation strength increases. Recognizing diffusion is much faster for cylinder morphologies than lamellar ones, we have investigated new cylinder-forming BCPs that enable defect elimination with thermal annealing processes. In addition, a formulation strategy is presented that further improves the kinetics of the assembly process, enabling tremendous improvements in defectivity over simple BCP systems. Excitingly, successful chemoepitaxy DSA with a high-χ lamellar BCP is also demonstrated using a thermal annealing process and no top coat. These technologies hold promise to enable DSA with thermal annealing processing across pitches from 40 - 16 nm.
ABSTRACT We studied the phase dynamics of a binary fluid containing particles by computer simulat... more ABSTRACT We studied the phase dynamics of a binary fluid containing particles by computer simulation in two dimensions. A time-dependent Ginzburgh-Landau equation coupled with a Navier-Stokes equation to solve the hydrodynamic interactions is numerically integrated in the calculation. Into the fluid mixture, we introduce immobile particles that have coupling interactions with one component of the fluid. We found that hydrodynamic effects are only important in the intermediate stage of domain growth. At later stage, the domain growth slows down and finally is pinned at some finite size. The pinning size of the domains decreases with the increase of the number density of particles and the coupling strength between particles and fluid.
Journal of Polymer Science Part A: Polymer Chemistry, 2014
ABSTRACT Polyester seed-oil derived polyols have been prepared and blended with conventional poly... more ABSTRACT Polyester seed-oil derived polyols have been prepared and blended with conventional polyols for making polyurethane elastomers. Miscibility was complete for polypropylene oxide/polyethylene oxide and polytetramethylene oxide (PTMEG). Blends of polyester seed-oil derived polyols with conventional polyester polyols (polybutylene adipate and ɛ-polycaprolactone) were immiscible or nearly so. Furthermore, the phase behavior (miscible vs. immiscible) did not change appreciably for each blend composition explored as a function of temperature at relevant ranges (up to the polyether ceiling temperature). This counter-intuitive result is found to be actually consistent with calculated solubility parameters for each polyol type and the phase diagrams computed on their basis. The phase behavior of the polyols is shown to have significant effects on the properties of polyurethane elastomers where immiscible polyols cause broadening of the glass transition distribution and significant reduction of ultimate tensile properties. However, here it is shown that immiscible systems containing polyester seed-oil derived polyols can be transesterified with the appropriate polyol partner of interest to create a new single phase polyol or that the polyester polyol monomers can also be copolymerized to make new single phase polyols, both of which result in improved polyurethane elastomer properties. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014
Polymer, 2002
We develop a coarse-grained model to investigate the in¯uence of nanoscale particles on the phase... more We develop a coarse-grained model to investigate the in¯uence of nanoscale particles on the phase separation and the morphology of symmetric AB diblock copolymer melts. The microphase separation is modeled by the cell dynamical systems (CDS) equations, while the particle dynamics is described by a Langevin equation. We assume that the particles have a selective af®nity to the A block and thus, can selfassemble and form clusters within A-domains. By varying the particle volume fraction, f p , we study the coupling between the microphase separation of the diblocks and the cluster formation for the particles. We also estimate the percolation threshold, f p , for the particles and ®nd that the presence of diblocks decreases f p by a factor slightly greater than two relative to the case of particles in a homopolymer (f p < 9% in a diblock vs. 22% in a homopolymer). This result can be useful in designing new composites with increased electrical conductivity and/or mechanical strength. q
ACS Symposium Series, 2001
ABSTRACT
Advances in Patterning Materials and Processes XXXI, 2014
ABSTRACT
Polyolefin Composites, 2007
ABSTRACT Introduction Nanocomposite Morphology, Thermodynamics, and Phase Behavior Nanocomposite ... more ABSTRACT Introduction Nanocomposite Morphology, Thermodynamics, and Phase Behavior Nanocomposite Rheology and Dynamics Prediction of Nanocomposite Properties Conclusions Acknowledgment Nomenclature References
Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 1999
We develop a mean-field rate-equation model for the kinetics of phase separation in binary mixtur... more We develop a mean-field rate-equation model for the kinetics of phase separation in binary mixtures with hard mobile impurities. For impurities preferentially wet by one of the components, the phase separation is arrested in the late stage. The "steady-state" domain size depends strongly on both the particle diffusion constant and the particle concentration. We compare theoretical results with the simulation data and find good qualitative agreement.
Journal of Photopolymer Science and Technology, 2013
Alternative Lithographic Technologies V, 2013
ABSTRACT Directed self-assembly (DSA) of block copolymers (BCPs) is a promising technology for ad... more ABSTRACT Directed self-assembly (DSA) of block copolymers (BCPs) is a promising technology for advanced patterning at future technology nodes, but significant hurdles remain for commercial implementation. The most widely studied material for DSA is poly(styrene-block-methyl methacrylate) (PS-PMMA), but the relatively weak segregation strength of PSPMMA results in some limitations. This paper reports on these limitations for PS-PMMA and highlights a path to success through use of more strongly segregated "high-χ" block copolymers. In general, stronger segregation is predicted to lower defectivity at equilibrium, but unfortunately, kinetics of self assembly also becomes much slower as segregation strength increases. Recognizing diffusion is much faster for cylinder morphologies than lamellar ones, we have investigated new cylinder-forming BCPs that enable defect elimination with thermal annealing processes. In addition, a formulation strategy is presented that further improves the kinetics of the assembly process, enabling tremendous improvements in defectivity over simple BCP systems. Excitingly, successful chemoepitaxy DSA with a high-χ lamellar BCP is also demonstrated using a thermal annealing process and no top coat. These technologies hold promise to enable DSA with thermal annealing processing across pitches from 40 - 16 nm.
ABSTRACT We studied the phase dynamics of a binary fluid containing particles by computer simulat... more ABSTRACT We studied the phase dynamics of a binary fluid containing particles by computer simulation in two dimensions. A time-dependent Ginzburgh-Landau equation coupled with a Navier-Stokes equation to solve the hydrodynamic interactions is numerically integrated in the calculation. Into the fluid mixture, we introduce immobile particles that have coupling interactions with one component of the fluid. We found that hydrodynamic effects are only important in the intermediate stage of domain growth. At later stage, the domain growth slows down and finally is pinned at some finite size. The pinning size of the domains decreases with the increase of the number density of particles and the coupling strength between particles and fluid.