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Nucleation mechanisms in microcellul...

Kweeder, James A.

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Nucleation mechanisms in microcellular polymer foams.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Nucleation mechanisms in microcellular polymer foams./
Author:	Kweeder, James A.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 1997,
Description:	94 p.
Notes:	Source: Dissertations Abstracts International, Volume: 59-02, Section: B.
Contained By:	Dissertations Abstracts International59-02B.
Subject:	Chemical engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9723494
ISBN:	9780591322965

Nucleation mechanisms in microcellular polymer foams.
Kweeder, James A.

Nucleation mechanisms in microcellular polymer foams. - Ann Arbor : ProQuest Dissertations & Theses, 1997 - 94 p.

Source: Dissertations Abstracts International, Volume: 59-02, Section: B.

Thesis (Ph.D.)--Clarkson University, 1997.

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

Existing models for microcellular foam nucleation fail to predict observed experimental results. Experimental results were compared to classical nucleation models and revealed irreconcilable differences. Based on the knowledge that microscopic defects exist in polymer systems, a new physical mechanism for foam cell formation is proposed which is consistent with experimental results. Rather than nucleating a new gas phase during foaming, one is instead trying to grow microscopic voids and cracks into the bubbles. From this concept, a thermodynamic model has been proposed for the activation of microvoids into viable foam cells. Study of the resulting model reaffirms the validity of the microvoid mechanism; but, it also demonstrates that foam cell nucleation can no longer be treated separately from the bubble growth phenomena.

ISBN: 9780591322965Subjects--Topical Terms:

560457
Chemical engineering.

Nucleation mechanisms in microcellular polymer foams.
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020 $a 9780591322965
035 $a (MiAaPQ)AAI9723494
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040 $a MiAaPQ $c MiAaPQ
100 1 $a Kweeder, James A. $3 3546437
245 1 0 $a Nucleation mechanisms in microcellular polymer foams.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1997
300 $a 94 p.
500 $a Source: Dissertations Abstracts International, Volume: 59-02, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Campbell, Gregory A.
502 $a Thesis (Ph.D.)--Clarkson University, 1997.
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 Existing models for microcellular foam nucleation fail to predict observed experimental results. Experimental results were compared to classical nucleation models and revealed irreconcilable differences. Based on the knowledge that microscopic defects exist in polymer systems, a new physical mechanism for foam cell formation is proposed which is consistent with experimental results. Rather than nucleating a new gas phase during foaming, one is instead trying to grow microscopic voids and cracks into the bubbles. From this concept, a thermodynamic model has been proposed for the activation of microvoids into viable foam cells. Study of the resulting model reaffirms the validity of the microvoid mechanism; but, it also demonstrates that foam cell nucleation can no longer be treated separately from the bubble growth phenomena.
590 $a School code: 0049.
650 4 $a Chemical engineering. $3 560457
650 4 $a Plastics. $3 649803
650 4 $a Materials science. $3 543314
690 $a 0542
690 $a 0795
690 $a 0794
710 2 $a Clarkson University. $3 1020943
773 0 $t Dissertations Abstracts International $g 59-02B.
790 $a 0049
791 $a Ph.D.
792 $a 1997
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9723494