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Continuous production of microcellul...

Han, Xiangmin.

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Continuous production of microcellular foams.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Continuous production of microcellular foams./
Author:	Han, Xiangmin.
Description:	356 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0323.
Contained By:	Dissertation Abstracts International65-01B.
Subject:	Engineering, Chemical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3119462

Continuous production of microcellular foams.
Han, Xiangmin.

Continuous production of microcellular foams. - 356 p.

Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0323.

Thesis (Ph.D.)--The Ohio State University, 2003.

Continuous production of microcellular foams, characterized by cell size smaller than 10 mum and cell density larger than 109 cells/cm 3, was studied using supercritical carbon dioxide (CO2) as the foaming agent. Microcellular foams of polystyrene and polystyrene nanocomposites were successfully produced on a two-stage single screw extruder.Subjects--Topical Terms:

1018531
Engineering, Chemical.

Continuous production of microcellular foams.
LDR:03321nmm 2200325 4500 001 1865387
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035 $a (UnM)AAI3119462
035 $a AAI3119462
040 $a UnM $c UnM
100 1 $a Han, Xiangmin. $3 1952836
245 1 0 $a Continuous production of microcellular foams.
300 $a 356 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0323.
500 $a Adviser: Kurt W. Koelling.
502 $a Thesis (Ph.D.)--The Ohio State University, 2003.
520 $a Continuous production of microcellular foams, characterized by cell size smaller than 10 mum and cell density larger than 109 cells/cm 3, was studied using supercritical carbon dioxide (CO2) as the foaming agent. Microcellular foams of polystyrene and polystyrene nanocomposites were successfully produced on a two-stage single screw extruder.
520 $a The contraction flow in the extrusion die was simulated with the FLUENT fluid dynamics computational code to predict profiles of pressure, temperature, viscosity, and velocity. The nucleation onset was determined based on the pressure profile and equilibrium solubility. It was shown that a high CO 2 concentration or a high foaming temperature induces an earlier nucleation near the die entrance. The pressure profile and the position of nucleation onset were correlated to cell nucleation and growth, which helps understand the effects of operating conditions on cell structure.
520 $a To perform the simulation, viscosity and solubility of the CO2/polystyrene system were characterized. Sanchez-Lacombe equation of state was applied to represent the phase equilibrium. Effects of temperature, pressure, and CO 2 content on the shear viscosity were explained using the free volume theory.
520 $a Systematic experiments were performed to verify effects of three key operating conditions: CO2 content, pressure drop or pressure drop rate, and foaming temperature, on the foam cell structure. Experimental results were compared with simulations to gain insight into the foaming process. Studies exhibit that a higher pressure drop or pressure drop rate results in smaller cells and greater cell density. Below the CO2 solubility, cell size decreases and cell density increases with an increase of CO2 concentration. A high CO2 concentration favors producing open cell foams. Die temperature affects both cell size and cell structure (open or closed).
520 $a Combining nano-clay compounding with supercritical CO2 foaming provides a new technique for the design and control of foam structure and property. The addition of a small amount of intercalated nano-clay greatly reduces cell size and increases cell density. Once exfoliated, the nanocomposite exhibits the highest cell density and smallest cell size at the same particle concentration. Nanocomposite foams provide superior performance and synergetic effects of nano-clay and CO2 on the polymer melt rheology were discussed.
590 $a School code: 0168.
650 4 $a Engineering, Chemical. $3 1018531
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0542
690 $a 0495
690 $a 0794
710 2 0 $a The Ohio State University. $3 718944
773 0 $t Dissertation Abstracts International $g 65-01B.
790 1 0 $a Koelling, Kurt W., $e advisor
790 $a 0168
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3119462