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Thermodynamics of polymer melts swollen with supercritical gases.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Thermodynamics of polymer melts swollen with supercritical gases./
Author:	Garg, Ashok.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 1993,
Description:	159 p.
Notes:	Source: Dissertations Abstracts International, Volume: 55-12, Section: B.
Contained By:	Dissertations Abstracts International55-12B.
Subject:	Chemical engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9418162
ISBN:	9798208126745

Thermodynamics of polymer melts swollen with supercritical gases.
Garg, Ashok.

Thermodynamics of polymer melts swollen with supercritical gases. - Ann Arbor : ProQuest Dissertations & Theses, 1993 - 159 p.

Source: Dissertations Abstracts International, Volume: 55-12, Section: B.

Thesis (Ph.D.)--Wayne State University, 1993.

This item must not be added to any third party search indexes.

The data for dissolution of supercritical gases in polymer melts are scarce. Most polymer processing operations employ conventional organic solvents and plasticizers which are not as effective as supercritical gases. The solubility data of supercritical gases in thermoplastic melts have been measured and correlated using the lattice theory based thermodynamic equations of state for predicting thermodynamic properties and viscosity reductions. The equilibrium solubilities of carbon dioxide in polydimethylsiloxane (PDMS) and, difluoroethane, an environmentally benign foaming agent, in polystyrene have been measured at temperatures which are both, above the glass transition temperatures of polymers, as well as above the critical temperatures of the gases. High solubilities of up to 40% for CO$\\sb{2}$ in PDMS and up to 30% for difluoroethane in polystyrene are observed when the experimental temperatures are closely matched to the critical temperatures of respective gases. The solubility data are fitted to the lattice model based thermodynamic equations of states requiring a single adjustable binary interaction parameter. Sanchez-Lacombe and Panayiotou-Vera equations of states are considered in this work, and the binary interaction parameters are found to monotonically increase with temperature. Both equations fail to reproduce the characteristic 'S' shaped experimental isotherms but Panayiotou-Vera equation of state provides a better fit of the experimental data. The importance of accurate estimation of pure components parameters and the binary interaction parameters for the equations of state are also discussed. Several other thermodynamic properties like swollen volume, isothermal compressibility and thermal expansion coefficient for the mixture are also predicted. An attempt is made to predict the viscosity reduction of polymer melts on account of dissolved supercritical gases by combining the thermodynamic equations of state with the free volume theory.

ISBN: 9798208126745Subjects--Topical Terms:

560457
Chemical engineering.

Thermodynamics of polymer melts swollen with supercritical gases.
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020 $a 9798208126745
035 $a (MiAaPQ)AAI9418162
035 $a AAI9418162
040 $a MiAaPQ $c MiAaPQ
100 1 $a Garg, Ashok. $3 3687488
245 1 0 $a Thermodynamics of polymer melts swollen with supercritical gases.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1993
300 $a 159 p.
500 $a Source: Dissertations Abstracts International, Volume: 55-12, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Gulari, Esin;Manke, Charles W.
502 $a Thesis (Ph.D.)--Wayne State University, 1993.
506 $a This item must not be added to any third party search indexes.
506 $a This item must not be sold to any third party vendors.
520 $a The data for dissolution of supercritical gases in polymer melts are scarce. Most polymer processing operations employ conventional organic solvents and plasticizers which are not as effective as supercritical gases. The solubility data of supercritical gases in thermoplastic melts have been measured and correlated using the lattice theory based thermodynamic equations of state for predicting thermodynamic properties and viscosity reductions. The equilibrium solubilities of carbon dioxide in polydimethylsiloxane (PDMS) and, difluoroethane, an environmentally benign foaming agent, in polystyrene have been measured at temperatures which are both, above the glass transition temperatures of polymers, as well as above the critical temperatures of the gases. High solubilities of up to 40% for CO$\\sb{2}$ in PDMS and up to 30% for difluoroethane in polystyrene are observed when the experimental temperatures are closely matched to the critical temperatures of respective gases. The solubility data are fitted to the lattice model based thermodynamic equations of states requiring a single adjustable binary interaction parameter. Sanchez-Lacombe and Panayiotou-Vera equations of states are considered in this work, and the binary interaction parameters are found to monotonically increase with temperature. Both equations fail to reproduce the characteristic 'S' shaped experimental isotherms but Panayiotou-Vera equation of state provides a better fit of the experimental data. The importance of accurate estimation of pure components parameters and the binary interaction parameters for the equations of state are also discussed. Several other thermodynamic properties like swollen volume, isothermal compressibility and thermal expansion coefficient for the mixture are also predicted. An attempt is made to predict the viscosity reduction of polymer melts on account of dissolved supercritical gases by combining the thermodynamic equations of state with the free volume theory.
590 $a School code: 0254.
650 4 $a Chemical engineering. $3 560457
650 4 $a Plastics. $3 649803
690 $a 0542
690 $a 0795
710 2 $a Wayne State University. $3 975058
773 0 $t Dissertations Abstracts International $g 55-12B.
790 $a 0254
791 $a Ph.D.
792 $a 1993
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9418162