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Bubble nucleation in polymeric liquids.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Bubble nucleation in polymeric liquids./
Author:	Han, James Hso-Pan.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 1988,
Description:	337 p.
Notes:	Source: Dissertations Abstracts International, Volume: 50-07, Section: B.
Contained By:	Dissertations Abstracts International50-07B.
Subject:	Polymers. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8818577
ISBN:	9798206855890

Bubble nucleation in polymeric liquids.
Han, James Hso-Pan.

Bubble nucleation in polymeric liquids. - Ann Arbor : ProQuest Dissertations & Theses, 1988 - 337 p.

Source: Dissertations Abstracts International, Volume: 50-07, Section: B.

Thesis (Ph.D.)--Polytechnic University, 1988.

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

The fundamental aspects of the mechanism of bubble nucleation in polymeric liquids were investigated both experimentally and theoretically. Laser light scattering techniques were developed for the experiments under static and dynamic conditions. In the static experiment, two mixtures, polystyrene/toluene and polystyrene/trichlorofluoromethane, were used. A mixture was placed in a high-pressure optical cell and then heated to a predetermined temperature under pressure. Helium gas was used to pressurize the system and a He-Ne laser was used as the light source. Upon releasing the pressure in the optical cell, both scattered and transmitted light fluxes were measured with two photomultipliers. An automated light scattering system was developed for the experiments. Simulation of Mie's scattering theory was performed for different experimental conditions and the corresponding theoretical scattering curves were constructed. The scattering geometry of the optical arrangement and the size distribution of bubbles were included in the theoretical scattering curves. The experimental scattering curves showed both maxima and minima in agreement with the theoretical scattering curves. Critical bubble size, bubble growth, size distribution, and bubble population density were determined. The effects of mixture concentration, temperature, and initial system pressure on the bubble nucleation process were discussed. In the dynamic experiment, a computer-controlled light scattering system was developed to detect the bubble nucleation site in a slit flow channel. A transparent slit die was constructed to study bubble nucleation during polymer melt flow. Mixtures of polystyrene and trichlorofluoromethane were used. A foam extrusion line was used to introduce the mixture into the transparent slit die. By varying the position of the optical control volume within the flow channel, and with the aid of a storage oscilloscope, the position at which bubble nucleated was determined. Based on the classical nucleation theory, a theory for bubble nucleation in polymer solutions was developed. A semi-empirical equation was also developed for the bubble nucleation rate determination. Computer simulations of the bubble nucleation in polymer solutions were performed.

ISBN: 9798206855890Subjects--Topical Terms:

535398
Polymers.

Bubble nucleation in polymeric liquids.
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020 $a 9798206855890
035 $a (MiAaPQ)AAI8818577
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040 $a MiAaPQ $c MiAaPQ
100 1 $a Han, James Hso-Pan. $3 3687483
245 1 0 $a Bubble nucleation in polymeric liquids.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1988
300 $a 337 p.
500 $a Source: Dissertations Abstracts International, Volume: 50-07, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Han, Chang Dae.
502 $a Thesis (Ph.D.)--Polytechnic University, 1988.
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 fundamental aspects of the mechanism of bubble nucleation in polymeric liquids were investigated both experimentally and theoretically. Laser light scattering techniques were developed for the experiments under static and dynamic conditions. In the static experiment, two mixtures, polystyrene/toluene and polystyrene/trichlorofluoromethane, were used. A mixture was placed in a high-pressure optical cell and then heated to a predetermined temperature under pressure. Helium gas was used to pressurize the system and a He-Ne laser was used as the light source. Upon releasing the pressure in the optical cell, both scattered and transmitted light fluxes were measured with two photomultipliers. An automated light scattering system was developed for the experiments. Simulation of Mie's scattering theory was performed for different experimental conditions and the corresponding theoretical scattering curves were constructed. The scattering geometry of the optical arrangement and the size distribution of bubbles were included in the theoretical scattering curves. The experimental scattering curves showed both maxima and minima in agreement with the theoretical scattering curves. Critical bubble size, bubble growth, size distribution, and bubble population density were determined. The effects of mixture concentration, temperature, and initial system pressure on the bubble nucleation process were discussed. In the dynamic experiment, a computer-controlled light scattering system was developed to detect the bubble nucleation site in a slit flow channel. A transparent slit die was constructed to study bubble nucleation during polymer melt flow. Mixtures of polystyrene and trichlorofluoromethane were used. A foam extrusion line was used to introduce the mixture into the transparent slit die. By varying the position of the optical control volume within the flow channel, and with the aid of a storage oscilloscope, the position at which bubble nucleated was determined. Based on the classical nucleation theory, a theory for bubble nucleation in polymer solutions was developed. A semi-empirical equation was also developed for the bubble nucleation rate determination. Computer simulations of the bubble nucleation in polymer solutions were performed.
590 $a School code: 0179.
650 4 $a Polymers. $3 535398
690 $a 0495
710 2 $a Polytechnic University. $3 1249856
773 0 $t Dissertations Abstracts International $g 50-07B.
790 $a 0179
791 $a Ph.D.
792 $a 1988
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8818577