Thermodynamics And Phase Behavior Of Miscible Polymer Blends In The Presence Of Supercritical Carbon Dioxide

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Thermodynamics And Phase Behavior Of Miscible Polymer Blends In The Presence Of Supercritical Carbon Dioxide

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Author : Nicholas Philip Young
language : en
Publisher:
Release Date : 2014

Thermodynamics And Phase Behavior Of Miscible Polymer Blends In The Presence Of Supercritical Carbon Dioxide written by Nicholas Philip Young and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.

Modification Of Polymer Blend Phase Behavior With High Pressure Carbon Dioxide

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Author :
language : en
Publisher:
Release Date : 2003

Modification Of Polymer Blend Phase Behavior With High Pressure Carbon Dioxide written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.

While much progress has been made since the time of Flory and Huggins in the understanding of polymer blend thermodynamics, and ongoing research continues to elucidate how polymer blend phase behavior is affected by the presence of small-molecule solvents or exposure to elevated pressures, very little work has been reported on the combined effects of a pressurized small-molecule solvent on polymer blend phase behavior. The focus of this research is to improve the current state of fundamental understanding regarding how and why the phase behavior of polymer blends changes as pressurized carbon dioxide (CO2) is added. The first part of this work provides a broad overview of previous efforts that explore various thermodynamic and kinetic processes involving the use of CO2 in conjunction with multicomponent polymer systems. The following chapters discuss details of research performed primarily on three blend systems: polystyrene (PS)/polyisoprene (PI), poly(vinylidene fluoride) (PVDF)/ poly(methyl methacrylate) (PMMA), and polydimethylsiloxane (PDMS)/poly(ethylmethylsiloxane) (PEMS). The competing roles of hydrostatic pressure and CO2 dissolution on the phase behavior of both the PS/PI and the PDMS/PEMS blends, which exhibit upper critical solution temperature (UCST) behavior, are systematically established. Additionally, a complete pseudo-binary temperature-composition phase diagram of the PDMS/PEMS blend is generated as a function of CO2 pressure. To compare the predictive abilities of the Flory-Huggins and Sanchez-Lacombe equations of state, interaction parameters of the PDMS/PEMS blend are predicted as functions of temperature and CO2 pressure. The phase behavior of, as well as intermolecular interactions in, PMMA/PVDF blends have been probed in the presence of CO2 by small-angle neutron and x-ray scattering (SANS and SAXS, respectively). These PMMA/PVDF blends, which display both UCST and lower critical solution temperature (LCST.

Phase Behavior Of Polymer Blends

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Author : Karl Freed
language : en
Publisher: Springer Science & Business Media
Release Date : 2005-09-01

Phase Behavior Of Polymer Blends written by Karl Freed and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-09-01 with Technology & Engineering categories.

Thermodynamics And Phase Behavior Or Polymer Blends And Solutions

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Author : Dmitry Gromov
language : en
Publisher:
Release Date : 1997

Thermodynamics And Phase Behavior Or Polymer Blends And Solutions written by Dmitry Gromov and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.

Phase Behavior Of Polymer Blends

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Author : Karl Freed
language : en
Publisher: Springer
Release Date : 2009-09-02

Phase Behavior Of Polymer Blends written by Karl Freed and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-09-02 with Technology & Engineering categories.

Theoretical And Experimental Investigation Of Phase Behavior Of Polymeric Systems In Supercritical Carbon Dioxide And Their Modeling Using Saft

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Author :
language : en
Publisher:
Release Date : 2005

Theoretical And Experimental Investigation Of Phase Behavior Of Polymeric Systems In Supercritical Carbon Dioxide And Their Modeling Using Saft written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.

Addition of high-pressure CO2 to polymer systems can have a profound impact on their thermodynamic properties and phase behavior, since the number of interacting species increases due to the high-pressures, so that the compressibility also increases, as well as the plasticity effects. Even then, polymers are only sparingly soluble in CO2 unless one uses an entrainer or surfactant. An addition of a liquid monomer co-solvent results in greatly enhanced polymer solubility in the supercritical fluid at rather mild conditions of lower temperatures and reduced pressures. The focus of this research is to measure, evaluate and model the phase behavior of the methyl methacrylate-CO2 and the poly (methyl methacrylate)-CO2-methyl methacrylatesystem, where methyl methacrylate plays role of a co-solvent.

Modification Of Polymer Blend Phase Behavior With High Pressure Carbon Dioxide

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Author : Teri Anne Walker
language : en
Publisher:
Release Date : 2003

Modification Of Polymer Blend Phase Behavior With High Pressure Carbon Dioxide written by Teri Anne Walker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.

Keywords: specrophotometry, miscibility, cloud curve, macromolecule.

Observations And Thermodynamic Interpretations Of Polymer Blend Phase Behavior

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Author : Kris Wilcox Haggard
language : en
Publisher:
Release Date : 2005

Observations And Thermodynamic Interpretations Of Polymer Blend Phase Behavior written by Kris Wilcox Haggard and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Phase rule and equilibrium categories.

Polymer Solution Supercritical Fluid Behavior

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Author : A. K. McClellan
language : en
Publisher:
Release Date : 1985

Polymer Solution Supercritical Fluid Behavior written by A. K. McClellan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with categories.

Experimental pressure-temperature(P-T)data are presented for the polystyrene-toluene-carbon dioxide system and the polystyrene-toluene-ethane system. The P-T phase diagrams for these systems exhibit characteristics which are similar to the phase diagrams of simple binary solutions. The addition of supercritical carbon dioxide and supercritical ethane to the polystyrene-toluene solution shifts the lower critical solution temperature curve to lower temperatures. Polymer-organic solvent-supercritical fluid additive phase behavior is interpreted in terms of Patterns of Patterson's corresponding states model. Representative calculations using this model are shown for the poly(ethylene-co-propylene) - hexane-supercritical ethane system. Originator supplied keywords include: Thermodynamic; Polymers; Lower critical solution temperature; Supercritical fluid.

Thermodynamic Model For Associating Polymer Solutions

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Author : Ibrahim Ali Ozkan
language : en
Publisher:
Release Date : 2004

Thermodynamic Model For Associating Polymer Solutions written by Ibrahim Ali Ozkan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Chemical models categories.

Polymer solutions in which there are strong specific interactions between the polymer and the solvent are of interest in a number of biological applications. Of particular interest are polymer solutions in which supercritical carbon dioxide (CO2) is the solvent, because polymer processing with CO2 is an important application of green chemistry. Unfortunately, experimental data on the phase behavior of polymer - CO2 systems are relatively scarce, as are models that describe the phase behavior of such systems. The focus of this research is therefore on developing a thermodynamic model based on lattice theory for calculating phase behavior of high pressure polymer solutions with specific intermolecular interactions. A new model, termed the LELAC (Lattice-based Extended Liquid Activity Coefficient) model is proposed based on the gART-L model of Sukhadia and Variankaval. The new model incorporates the compressibility effect at high pressures. The parameters of the model are (1) the equilibrium constant for association between a polymer segment and a solvent, (2) the specific interaction energy between a polymer segment and a solvent, and (3) the dispersion interaction energy. The dispersion interaction energy is calculated using Regular Solution Theory and therefore depends on the pure component properties. One or both of the remaining parameters is obtained from independent measurements such as FT- IR spectra. Alternatively, the two parameters can be obtained by fitting data. Cloud point curves of polymer - CO2 systems have been successfully correlated (1.3 % error) with the new model. Also, using fitted parameters from cloud point data, the sorption behavior of CO2 in polymers has been predicted. The polymer investigated include PBMA, PVAc and Polyacrylates. Comparison of cloud points with those obtained using the SAFT model revealed that the new model performs better than the SAFT model (3.6% error) with two adjustable parameters. The use of FT-IR to investigate interactions between CO2 and a number of polymers has been studied. The results confirm that complexes are formed between CO2 and PMMA, PEMA, PBMA, PVMK, and PVAc. A complex of PVC and CO2 is reported and a new mechanism involving a carbon 6 oxygen triple bond is postulated for this system.