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Microlayer morphology via polymer me...

Levitt, Leon.

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Microlayer morphology via polymer melt processing.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Microlayer morphology via polymer melt processing./
Author:	Levitt, Leon.
Description:	179 p.
Notes:	Source: Dissertation Abstracts International, Volume: 58-04, Section: B, page: 2010.
Contained By:	Dissertation Abstracts International58-04B.
Subject:	Engineering, Chemical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9728967
ISBN:	0591381044

Microlayer morphology via polymer melt processing.
Levitt, Leon.

Microlayer morphology via polymer melt processing. - 179 p.

Source: Dissertation Abstracts International, Volume: 58-04, Section: B, page: 2010.

Thesis (Ph.D.)--University of Minnesota, 1997.

Area generation is frequently observed in polymer melt blending and co-extrusion. In the first part of the work we considered the deformation of individual polymer drops, which is a part of morphology development during blending. Drops of varying viscosity and elasticity were sheared in a matrix of another polymer. The novel apparatus with two transparent, counter-rotating parallel disks provided simple shear flow. It was found that with high matrix elasticity drops of the minor phase stretched perpendicular to the flow direction. This is the first report of widening of drops in shear flow. An analytical relation was established between the second normal stress differences of the phases and degree of widening. The formation of sheets and the phenomena of widening results in a larger than affine area generation.

ISBN: 0591381044Subjects--Topical Terms:

1018531
Engineering, Chemical.

Microlayer morphology via polymer melt processing.
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100 1 $a Levitt, Leon. $3 1907576
245 1 0 $a Microlayer morphology via polymer melt processing.
300 $a 179 p.
500 $a Source: Dissertation Abstracts International, Volume: 58-04, Section: B, page: 2010.
502 $a Thesis (Ph.D.)--University of Minnesota, 1997.
520 $a Area generation is frequently observed in polymer melt blending and co-extrusion. In the first part of the work we considered the deformation of individual polymer drops, which is a part of morphology development during blending. Drops of varying viscosity and elasticity were sheared in a matrix of another polymer. The novel apparatus with two transparent, counter-rotating parallel disks provided simple shear flow. It was found that with high matrix elasticity drops of the minor phase stretched perpendicular to the flow direction. This is the first report of widening of drops in shear flow. An analytical relation was established between the second normal stress differences of the phases and degree of widening. The formation of sheets and the phenomena of widening results in a larger than affine area generation.
520 $a The influence of block copolymers (BCP) and interfacial reaction on polymer drop deformation inside a polymer matrix was also studied. The efficiency of stretching is measured in terms of the reduced area. It is shown that addition of BCP significantly increases the amount of area the deforming drop generates when subjected to simple shear flow field. Interfacial imidation reaction was shown to be very effective in improving the adhesion between the phases and thus creation of more area.
520 $a At certain processing conditions the drops can be stretched into continuous sheets. Then the structure can be treated as a sequence of alternating layers which also represents the case of coextruded multilayer film or sheet. When an alternating stack of molten polymer sheets is pulled in uniaxial tension parallel to the layers, interfacial area per unit volume increases, amplifying interfacial effects. Multilayers of several polymer pairs were prepared by lamination as well as coextrusion. Pairs with low and high interfacial tension, and pairs with functional groups which could react were selected. These were stretched at various constant extension rates in a rotating clamp extensional rheometer at temperatures well above melting. The contribution of the cross linked interface was shown to follow rubber elasticity theory. Shear properties of multilayered polymer melt samples were also investigated.
590 $a School code: 0130.
650 4 $a Engineering, Chemical. $3 1018531
650 4 $a Plastics Technology. $3 1023683
690 $a 0542
690 $a 0795
710 2 0 $a University of Minnesota. $3 676231
773 0 $t Dissertation Abstracts International $g 58-04B.
790 $a 0130
791 $a Ph.D.
792 $a 1997
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9728967