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A rheological investigation of polydimethylsiloxane swollen with supercritical carbon dioxide.

Record Type:	Electronic resources : Monograph/item
Title/Author:	A rheological investigation of polydimethylsiloxane swollen with supercritical carbon dioxide./
Author:	Gerhardt, Linda Johanna.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 1994,
Description:	222 p.
Notes:	Source: Dissertations Abstracts International, Volume: 56-12, Section: B.
Contained By:	Dissertations Abstracts International56-12B.
Subject:	Chemical engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9519894
ISBN:	9798208798331

A rheological investigation of polydimethylsiloxane swollen with supercritical carbon dioxide.
Gerhardt, Linda Johanna.

A rheological investigation of polydimethylsiloxane swollen with supercritical carbon dioxide. - Ann Arbor : ProQuest Dissertations & Theses, 1994 - 222 p.

Source: Dissertations Abstracts International, Volume: 56-12, Section: B.

Thesis (Ph.D.)--Wayne State University, 1994.

This item must not be sold to any third party vendors.

The behavior of molten thermoplastic polymers containing dissolved supercritical gases are pertinent to such processing operations as the manufacture of thermoplastic composites and polymer foams. Knowledge of supercritical gas solubility in polymer melts and the effects of these dissolved gases on the physical properties of the melt are of importance in the optimization of these processes. Experimental and theoretical investigations of both the solubility of supercritical gases in molten polymers and the rheology of these fluids are presented. Solubility measurements were conducted at temperatures far above the glass transition temperature for a system composed of supercritical carbon dioxide dissolved in a highly entangled polydimethylsiloxane (PDMS), a liquid polymer under ambient conditions. Non-Newtonian rheological measurements of these systems on a high-pressure modified capillary extrusion rheometer showed substantial viscosity reduction due to the dissolved gas, along with corresponding shifts in the shear rate dependence of the viscosity curves. Master curves were constructed from these rheological data through the application of a composition-dependent analog to the WLF temperature-dependent shift factor. In the theoretical modeling of the experimental data, a combination of two lattice-based equations of state (EOS) and a free volume rheological model was employed. The thermodynamic behavior of the systems was modeled through the application of both the Sanchez-Lacombe and the Panayiotou-Vera equations of state, where a regression fit of the experimental data was applied in the prediction of gas solubility. Mixture densities obtained from the EOS models were used in the calculation of the fractional free volume present in the polymer-gas systems, and these calculated free volumes were then used to correlate the composition-dependent Newtonian viscosity reductions through the application of the free volume rheological model.

ISBN: 9798208798331Subjects--Topical Terms:

560457
Chemical engineering.

A rheological investigation of polydimethylsiloxane swollen with supercritical carbon dioxide.
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020 $a 9798208798331
035 $a (MiAaPQ)AAI9519894
035 $a AAI9519894
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100 1 $a Gerhardt, Linda Johanna. $3 3687489
245 1 0 $a A rheological investigation of polydimethylsiloxane swollen with supercritical carbon dioxide.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1994
300 $a 222 p.
500 $a Source: Dissertations Abstracts International, Volume: 56-12, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Gulari, Esin;Manke, Charles W.
502 $a Thesis (Ph.D.)--Wayne State University, 1994.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a The behavior of molten thermoplastic polymers containing dissolved supercritical gases are pertinent to such processing operations as the manufacture of thermoplastic composites and polymer foams. Knowledge of supercritical gas solubility in polymer melts and the effects of these dissolved gases on the physical properties of the melt are of importance in the optimization of these processes. Experimental and theoretical investigations of both the solubility of supercritical gases in molten polymers and the rheology of these fluids are presented. Solubility measurements were conducted at temperatures far above the glass transition temperature for a system composed of supercritical carbon dioxide dissolved in a highly entangled polydimethylsiloxane (PDMS), a liquid polymer under ambient conditions. Non-Newtonian rheological measurements of these systems on a high-pressure modified capillary extrusion rheometer showed substantial viscosity reduction due to the dissolved gas, along with corresponding shifts in the shear rate dependence of the viscosity curves. Master curves were constructed from these rheological data through the application of a composition-dependent analog to the WLF temperature-dependent shift factor. In the theoretical modeling of the experimental data, a combination of two lattice-based equations of state (EOS) and a free volume rheological model was employed. The thermodynamic behavior of the systems was modeled through the application of both the Sanchez-Lacombe and the Panayiotou-Vera equations of state, where a regression fit of the experimental data was applied in the prediction of gas solubility. Mixture densities obtained from the EOS models were used in the calculation of the fractional free volume present in the polymer-gas systems, and these calculated free volumes were then used to correlate the composition-dependent Newtonian viscosity reductions through the application of the free volume rheological model.
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 56-12B.
790 $a 0254
791 $a Ph.D.
792 $a 1994
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9519894