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Viscosity reduction of polymeric liquids by dissolved gases.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Viscosity reduction of polymeric liquids by dissolved gases./
Author:	Bae, Young Chan.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 1989,
Description:	174 p.
Notes:	Source: Dissertations Abstracts International, Volume: 52-02, Section: B.
Contained By:	Dissertations Abstracts International52-02B.
Subject:	Chemical engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9022371
ISBN:	9798207345772

Viscosity reduction of polymeric liquids by dissolved gases.
Bae, Young Chan.

Viscosity reduction of polymeric liquids by dissolved gases. - Ann Arbor : ProQuest Dissertations & Theses, 1989 - 174 p.

Source: Dissertations Abstracts International, Volume: 52-02, Section: B.

Thesis (Ph.D.)--Wayne State University, 1989.

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

The low-shear-rate viscosities of Polyethylene Glycol(PEG)-CO$\\sb2$ and Polydimethylsiloxane(PDMS)-CO$\\sb2$ solutions were measured over a range of pressures (1-8 MPa) and temperature (30-60$\\sp\\circ$C). The results of PEG-CO$\\sb2$ solutions showed the interesting observations as follows: In the high range of volume fraction of polymer, $\\phi\\sb{\\rm p}$, or at low pressures, the plasticization effect is stronger than that of the pressure, the solution viscosity decreases as more CO$\\sb2$ dissolves in the polymer. At higher pressures, the viscosity reduction reverses and the viscosity of PEG-CO$\\sb2$ solutions increases. For PEG-CO$\\sb2$ solutions, photon correlation spectroscopy (PCS) was used to determine the viscosities based on measuring diffusivities of suspended colloidal particles. Assuming spherical particles and knowing the size of particles, the Stokes-Einstein relation was employed to find the medium viscosity. For PDMS-CO$\\sb2$ solutions, the viscosities were measured by using a specially designed falling ball viscometer (FBV). The Stokes equation was used to determine the viscosities. The Kelley-Bueche (K-B) free volume treatment of the viscosities of polymeric solutions was modified to account for gas solvents and applied to interpret our data on PEG-CO$\\sb2$ and PDMS-CO$\\sb2$ solutions. It was shown that the theoretical equation, based on the assumption of the additivity of free volumes of the components, was capable of predicting with excellent accuracy the concentration, temperature and pressure dependence of the viscosities of the investigated polymeric solutions. The reversal of viscosity reduction observed in the experimental data is predicted by the modified K-B theory. For PEG-CO$\\sb2$ solution, in the low range of $\\phi\\sb{\\rm p}$ (or at high pressures), however, there is a notable deviation between the theory and experimental data. It is suspected that aggregation of particles plays an important role and systematically affects these viscosities determined from PCS measurement.

ISBN: 9798207345772Subjects--Topical Terms:

560457
Chemical engineering.
Subjects--Index Terms:

gases

Viscosity reduction of polymeric liquids by dissolved gases.
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020 $a 9798207345772
035 $a (MiAaPQ)AAI9022371
035 $a AAI9022371
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100 1 $a Bae, Young Chan. $3 3687486
245 1 0 $a Viscosity reduction of polymeric liquids by dissolved gases.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1989
300 $a 174 p.
500 $a Source: Dissertations Abstracts International, Volume: 52-02, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Gulari, E.
502 $a Thesis (Ph.D.)--Wayne State University, 1989.
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 $a The low-shear-rate viscosities of Polyethylene Glycol(PEG)-CO$\\sb2$ and Polydimethylsiloxane(PDMS)-CO$\\sb2$ solutions were measured over a range of pressures (1-8 MPa) and temperature (30-60$\\sp\\circ$C). The results of PEG-CO$\\sb2$ solutions showed the interesting observations as follows: In the high range of volume fraction of polymer, $\\phi\\sb{\\rm p}$, or at low pressures, the plasticization effect is stronger than that of the pressure, the solution viscosity decreases as more CO$\\sb2$ dissolves in the polymer. At higher pressures, the viscosity reduction reverses and the viscosity of PEG-CO$\\sb2$ solutions increases. For PEG-CO$\\sb2$ solutions, photon correlation spectroscopy (PCS) was used to determine the viscosities based on measuring diffusivities of suspended colloidal particles. Assuming spherical particles and knowing the size of particles, the Stokes-Einstein relation was employed to find the medium viscosity. For PDMS-CO$\\sb2$ solutions, the viscosities were measured by using a specially designed falling ball viscometer (FBV). The Stokes equation was used to determine the viscosities. The Kelley-Bueche (K-B) free volume treatment of the viscosities of polymeric solutions was modified to account for gas solvents and applied to interpret our data on PEG-CO$\\sb2$ and PDMS-CO$\\sb2$ solutions. It was shown that the theoretical equation, based on the assumption of the additivity of free volumes of the components, was capable of predicting with excellent accuracy the concentration, temperature and pressure dependence of the viscosities of the investigated polymeric solutions. The reversal of viscosity reduction observed in the experimental data is predicted by the modified K-B theory. For PEG-CO$\\sb2$ solution, in the low range of $\\phi\\sb{\\rm p}$ (or at high pressures), however, there is a notable deviation between the theory and experimental data. It is suspected that aggregation of particles plays an important role and systematically affects these viscosities determined from PCS measurement.
590 $a School code: 0254.
650 4 $a Chemical engineering. $3 560457
650 4 $a Polymers. $3 535398
653 $a gases
690 $a 0542
690 $a 0495
710 2 $a Wayne State University. $3 975058
773 0 $t Dissertations Abstracts International $g 52-02B.
790 $a 0254
791 $a Ph.D.
792 $a 1989
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9022371