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Polymeric bicontinuous microemulsions.

Krishnan, Kasiraman.

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Polymeric bicontinuous microemulsions.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Polymeric bicontinuous microemulsions./
作者:	Krishnan, Kasiraman.
面頁冊數:	349 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-04, Section: B, page: 1823.
Contained By:	Dissertation Abstracts International64-04B.
標題:	Engineering, Chemical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3087766
ISBN:	0496355368

Polymeric bicontinuous microemulsions.
Krishnan, Kasiraman.

Polymeric bicontinuous microemulsions. - 349 p.

Source: Dissertation Abstracts International, Volume: 64-04, Section: B, page: 1823.

Thesis (Ph.D.)--University of Minnesota, 2003.

Rheology of complex fluids has been a topic of considerable interest recently. Bicontinuous microemulsions (BmuE), made by mixing appropriate amounts of oil, water and a surfactant, form a unique class of complex fluids. They possess a characteristic nanostructure consisting of undulating surfaces with vanishingly small interfacial curvature. BmuEs can also be generated in polymers by mixing appropriate amounts of two homopolymers and their corresponding diblock copolymer. The main objective of the present research is to study effects of shear on a model polymeric BmuE. Scattering is used as a predominant tool with in situ flow devices, along with optical microscopy and rheology. The model BmuE consists of a ternary blend of poly(ethyl ethylene) (PEE), poly(dimethyl siloxane) (PDMS) and a PEE-PDMS diblock copolymer.

ISBN: 0496355368Subjects--Topical Terms:

1018531
Engineering, Chemical.

Polymeric bicontinuous microemulsions.
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245 1 0 $a Polymeric bicontinuous microemulsions.
300 $a 349 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-04, Section: B, page: 1823.
500 $a Advisers: Frank S. Bates; Timothy P. Lodge.
502 $a Thesis (Ph.D.)--University of Minnesota, 2003.
520 $a Rheology of complex fluids has been a topic of considerable interest recently. Bicontinuous microemulsions (BmuE), made by mixing appropriate amounts of oil, water and a surfactant, form a unique class of complex fluids. They possess a characteristic nanostructure consisting of undulating surfaces with vanishingly small interfacial curvature. BmuEs can also be generated in polymers by mixing appropriate amounts of two homopolymers and their corresponding diblock copolymer. The main objective of the present research is to study effects of shear on a model polymeric BmuE. Scattering is used as a predominant tool with in situ flow devices, along with optical microscopy and rheology. The model BmuE consists of a ternary blend of poly(ethyl ethylene) (PEE), poly(dimethyl siloxane) (PDMS) and a PEE-PDMS diblock copolymer.
520 $a Steady shear experiments reveal four regimes as a function of shear rate. At low shear rates (regime I), Newtonian behavior is observed; there is onset of shear thinning at higher rates (regime II). In regime III, the stress is independent of shear rate, whereas it increases with shear rate once again in regime IV. Morphological characterization was carried out for each of these four regimes using scattering and microscopy, the key result being the evidence for flow-induced phase separation in regime III. Transient rheological measurements were conducted for startup and step changes in shear rate, and the BmuE exhibits features similar to worm-like micellar colloidal systems. Time-resolved light scattering and microscopy also reveal interesting characteristics. Dynamic mechanical spectroscopy indicates similarities with neat block copolymers near the order-disorder transition. The equilibrium rheological behavior is intriguing and detailed comparisons are made with Landau-Ginzburg theoretical models. Other areas of research as a part of this thesis include study of structural dynamics of BmuEs with dynamic light scattering, and the rheological properties of hyperswollen lamellar phases.
520 $a Polymer microemulsions occupy a narrow composition range intermediate between block copolymer lamellae, with organization at the nanometer-scale, and phase separated polymer blends, which typically exhibit micron-scale multiphase morphology. Shear flow of this microemulsion is found to result in very interesting flow-induced structural phenomena that bridge this gap between nanostructure and microstructure.
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710 2 0 $a University of Minnesota. $3 676231
773 0 $t Dissertation Abstracts International $g 64-04B.
790 1 0 $a Bates, Frank S., $e advisor
790 1 0 $a Lodge, Timothy P., $e advisor
790 $a 0130
791 $a Ph.D.
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