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Cocontinuous Polymer Blends: Control...

Hedegaard, Aaron Thomas.

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Cocontinuous Polymer Blends: Controlling Morphology via Interfacial Modification and Rheology.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Cocontinuous Polymer Blends: Controlling Morphology via Interfacial Modification and Rheology./
Author:	Hedegaard, Aaron Thomas.
Description:	259 p.
Notes:	Source: Dissertation Abstracts International, Volume: 76-03(E), Section: B.
Contained By:	Dissertation Abstracts International76-03B(E).
Subject:	Polymer chemistry. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3645331
ISBN:	9781321342376

Cocontinuous Polymer Blends: Controlling Morphology via Interfacial Modification and Rheology.
Hedegaard, Aaron Thomas.

Cocontinuous Polymer Blends: Controlling Morphology via Interfacial Modification and Rheology. - 259 p.

Source: Dissertation Abstracts International, Volume: 76-03(E), Section: B.

Thesis (Ph.D.)--University of Minnesota, 2014.

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

Cocontinuous polymer blends are formed by melt blending two or more immiscible polymers to form multiple continuous interpenetrated networks. These are non-equilibrium structures where the morphology is determined by a combination of processing conditions, interfacial properties, and rheology. Thermodynamic instability causes the morphology to coarsen during annealing. Furthermore, a thorough understanding of the conditions and mechanism of cocontinuity formation has not been developed, and predictive models are empirical and frequently contradictory. This thesis seeks to advance the field of immiscible polymer blends by providing insight to two critical questions. First, can a better understanding of the role of interfacial stabilization on cocontinuity be developed? Second, can morphological predictions based on rheology be improved?

ISBN: 9781321342376Subjects--Topical Terms:

3173488
Polymer chemistry.

Cocontinuous Polymer Blends: Controlling Morphology via Interfacial Modification and Rheology.
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020 $a 9781321342376
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100 1 $a Hedegaard, Aaron Thomas. $3 3173613
245 1 0 $a Cocontinuous Polymer Blends: Controlling Morphology via Interfacial Modification and Rheology.
300 $a 259 p.
500 $a Source: Dissertation Abstracts International, Volume: 76-03(E), Section: B.
500 $a Adviser: Christopher W. Macosko.
502 $a Thesis (Ph.D.)--University of Minnesota, 2014.
506 $a This item must not be sold to any third party vendors.
520 $a Cocontinuous polymer blends are formed by melt blending two or more immiscible polymers to form multiple continuous interpenetrated networks. These are non-equilibrium structures where the morphology is determined by a combination of processing conditions, interfacial properties, and rheology. Thermodynamic instability causes the morphology to coarsen during annealing. Furthermore, a thorough understanding of the conditions and mechanism of cocontinuity formation has not been developed, and predictive models are empirical and frequently contradictory. This thesis seeks to advance the field of immiscible polymer blends by providing insight to two critical questions. First, can a better understanding of the role of interfacial stabilization on cocontinuity be developed? Second, can morphological predictions based on rheology be improved?
520 $a Concerning interfacial stabilization, this thesis approaches the problem via reactive blending and interfacially localized clay nanoparticles. The effectiveness of reactive blending was found to be heavily dependent on the molecular weight of the reactive polymers. Also, the formation of a copolymer brush at the interface was able to prevent coarsening due to a compression of that brush when interfacial area decreased. Nanoclays, when interfacially localized, were found to also prevent coarsening by jamming at the interface, and the combined compatibilization mechanism of reaction and clay was found to achieve the smallest phase sizes. As an application, these compatibilized blends were also tested as gas separation membranes.
520 $a Concerning the predictions of cocontinuity, various models from the literature were tested against experimental data to determine the center of the compositions that resulted in cocontinuity. It was found that models based on droplet packing worked best, though they gave no information concerning the range of cocontinuous compositions. Various mechanisms and rules of thumb were developed from the present work to provide much-needed insight for predicting the relative size of these ranges. This study also investigated the role of extensional viscosity on cocontinuity by blending with long-chain branched polymers, where it was found that strain hardening branched polymers significantly broadened the range of cocontinuity. This demonstrated a shortcoming in the existing predictive models, which have only considered shear rheology when predicting cocontinuity.
590 $a School code: 0130.
650 4 $a Polymer chemistry. $3 3173488
650 4 $a Chemical engineering. $3 560457
690 $a 0495
690 $a 0542
710 2 $a University of Minnesota. $b Chemical Engineering. $3 1021870
773 0 $t Dissertation Abstracts International $g 76-03B(E).
790 $a 0130
791 $a Ph.D.
792 $a 2014
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3645331