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Deformation and fracture of cross-li...

Lin, Wei-Chun.

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Deformation and fracture of cross-linked polymer gels.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Deformation and fracture of cross-linked polymer gels./
Author:	Lin, Wei-Chun.
Description:	196 p.
Notes:	Adviser: Kenneth R. Shull.
Contained By:	Dissertation Abstracts International68-09B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3278055
ISBN:	9780549220060

Deformation and fracture of cross-linked polymer gels.
Lin, Wei-Chun.

Deformation and fracture of cross-linked polymer gels. - 196 p.

Adviser: Kenneth R. Shull.

Thesis (Ph.D.)--Northwestern University, 2007.

Because soft materials, particularly polymer gels, are playing a greater role in industrial and biotechnological applications today, the exploration of their mechanical behavior over a range of deformations is becoming more relevant in our daily lives. Understanding these properties is therefore necessary as a means to predict their response for specific applications. To address these concerns, this dissertation presents a set of analytic tools based on flat punch probe indentation tests to predict the response of polymer gels from a mechanical perspective over a large range of stresses and at failure.

ISBN: 9780549220060Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Deformation and fracture of cross-linked polymer gels.
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020 $a 9780549220060
035 $a (UMI)AAI3278055
035 $a AAI3278055
040 $a UMI $c UMI
100 1 $a Lin, Wei-Chun. $3 1280739
245 1 0 $a Deformation and fracture of cross-linked polymer gels.
300 $a 196 p.
500 $a Adviser: Kenneth R. Shull.
500 $a Source: Dissertation Abstracts International, Volume: 68-09, Section: B, page: 6233.
502 $a Thesis (Ph.D.)--Northwestern University, 2007.
520 $a Because soft materials, particularly polymer gels, are playing a greater role in industrial and biotechnological applications today, the exploration of their mechanical behavior over a range of deformations is becoming more relevant in our daily lives. Understanding these properties is therefore necessary as a means to predict their response for specific applications. To address these concerns, this dissertation presents a set of analytic tools based on flat punch probe indentation tests to predict the response of polymer gels from a mechanical perspective over a large range of stresses and at failure.
520 $a At small strains, a novel technique is developed to determine the transport properties of gels based on their measured mechanical behavior. Assuming that a polymer gel behaves in a similar manner as a porous structure, the differentiation of solvent flow from viscoelasticity of a gel network is shown to be possible utilizing a flat, circular punch and a flat, rectangular punch under oscillatory conditions. Use of the technique is demonstrated with a poly(N-isopropyl acrylamide) (pNIPAM) hydrogel. Our results indicate that solvent flow is inhibited at temperatures above the critical solution temperature of 35°C.
520 $a At high stresses and fracture, the flat probe punch indentation geometry is used to understand how the structure and geometry of silicone based gels affect their mechanical properties. A delayed failure response of the gels is observed and the modes of failure are found to be dependent on the geometry of the system. The addition of a sol fraction in these gels was found to toughen the network and play an important role at these large deformations. Potential mechanisms of fracture resistance are discussed, as is the effect of geometric confinement as it relates to large scale deformation and fracture. These results lay the groundwork for understanding the mechanical response of other highly, deformable material systems utilizing this particular geometry.
590 $a School code: 0163.
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0495
690 $a 0794
710 2 $a Northwestern University. $b Materials Science and Engineering. $3 1058406
773 0 $t Dissertation Abstracts International $g 68-09B.
790 $a 0163
790 1 0 $a Burghardt, Wesley R. $e committee member
790 1 0 $a Faber, Katherine T. $e committee member
790 1 0 $a Olvera, Monica $e committee member
790 1 0 $a Shull, Kenneth R., $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3278055