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Wrinkling of solidifying polymeric c...

Basu, Soumendra Kumar.

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Wrinkling of solidifying polymeric coatings.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Wrinkling of solidifying polymeric coatings./
Author:	Basu, Soumendra Kumar.
Description:	214 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1581.
Contained By:	Dissertation Abstracts International66-03B.
Subject:	Engineering, Chemical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3167666
ISBN:	9780542035500

Wrinkling of solidifying polymeric coatings.
Basu, Soumendra Kumar.

Wrinkling of solidifying polymeric coatings. - 214 p.

Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1581.

Thesis (Ph.D.)--University of Minnesota, 2005.

In coatings, wrinkles are viewed as defects or as desired features for low gloss, and texture. In either case, discovering the origin of wrinkles and the conditions that lead to their formation is important. This research examines what wrinkling requires and proposes a mechanism to explain the observations.

ISBN: 9780542035500Subjects--Topical Terms:

1018531
Engineering, Chemical.

Wrinkling of solidifying polymeric coatings.
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100 1 $a Basu, Soumendra Kumar. $3 1908987
245 1 0 $a Wrinkling of solidifying polymeric coatings.
300 $a 214 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1581.
500 $a Advisers: L. E. Scriven; Lorraine F. Francis; Alon Victor McCormick.
502 $a Thesis (Ph.D.)--University of Minnesota, 2005.
520 $a In coatings, wrinkles are viewed as defects or as desired features for low gloss, and texture. In either case, discovering the origin of wrinkles and the conditions that lead to their formation is important. This research examines what wrinkling requires and proposes a mechanism to explain the observations.
520 $a All curing wrinkling coatings contain multi-functional reactants. Upon curing, all develop a depth-wise gradient in solidification that result in a cross-linked elastic skin atop a viscous bottom layer. It is hypothesized that compressive stress develops in the skin when liquid below diffuses up into the skin. High enough compressive stress buckles the skin to produce wrinkles. The hypothesis is substantiated by experimental and theoretical evidences.
520 $a Effects of various application and compositional parameters on wrinkle size in a liquid-applied acrylic coating and a powder-applied epoxy coating were examined. All three components, namely resin, cross-linker and catalyst blocked with at least equimolar volatile blocker, proved to be required for wrinkling. The wrinkling phenomenon was modeled with a theory that accounts for gradient generation, cross-linking reaction and skinning; predictions compared well with observations.
520 $a Two-layer non-curing coatings that have a stiff elastic layer atop a complaint elastic bottom layer wrinkled when the top layer is compressed. The top layer was compressed by either moisture absorption or differential thermal expansion. Experimental observations compared well with predictions from a theory based on force balance in multilayer systems subjected to differential contraction or expansion.
520 $a A model based on the Flory-Rehner free energy of a constrained cross-linked gel was constructed that predicts the compressive stress generated in a coating when it absorbs solvent. Linear stability analysis predicts that when a compressed elastic layer is attached atop a viscous layer, it is always unstable to buckles whose wavelength exceeds a critical value; more cross-linking and poor solvent produce higher wavelength, lower amplitude wrinkles. When a compressed elastic layer is attached atop an elastic layer and subjected to more than a critical compressive stress, it is unstable to intermediate wavelengths of buckling; better solvent, higher ratio of bottom-to-top layer thickness, and lower bottom layer modulus produce higher wavelength, higher amplitude wrinkles.
590 $a School code: 0130.
650 4 $a Engineering, Chemical. $3 1018531
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Applied Mechanics. $3 1018410
690 $a 0542
690 $a 0794
690 $a 0346
710 2 0 $a University of Minnesota. $3 676231
773 0 $t Dissertation Abstracts International $g 66-03B.
790 1 0 $a Scriven, L. E., $e advisor
790 1 0 $a Francis, Lorraine F., $e advisor
790 1 0 $a McCormick, Alon Victor, $e advisor
790 $a 0130
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3167666