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Controlled assembly of triblock copo...

Chen, Zhiyun.

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Controlled assembly of triblock copolymers into nano-objects with varied shapes.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Controlled assembly of triblock copolymers into nano-objects with varied shapes./
作者:	Chen, Zhiyun.
面頁冊數:	162 p.
附註:	Adviser: Karen L. Wooley.
Contained By:	Dissertation Abstracts International68-06B.
標題:	Chemistry, Polymer. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3268017
ISBN:	9780549070511

Controlled assembly of triblock copolymers into nano-objects with varied shapes.
Chen, Zhiyun.

Controlled assembly of triblock copolymers into nano-objects with varied shapes. - 162 p.

Adviser: Karen L. Wooley.

Thesis (Ph.D.)--Washington University in St. Louis, 2007.

The fundamental rules that govern the self assembly behaviors of amphiphilic triblock copolymers were probed in this dissertation research with a purpose to control the structures of the resulting polymeric nano-objects as a rich arsenal of building blocks for "bottom-up" nano-fabrication strategies.

ISBN: 9780549070511Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Controlled assembly of triblock copolymers into nano-objects with varied shapes.
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245 1 0 $a Controlled assembly of triblock copolymers into nano-objects with varied shapes.
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520 $a The fundamental rules that govern the self assembly behaviors of amphiphilic triblock copolymers were probed in this dissertation research with a purpose to control the structures of the resulting polymeric nano-objects as a rich arsenal of building blocks for "bottom-up" nano-fabrication strategies.
520 $a The solution-state self assembly behaviors of triblock copolymers poly(acrylic acid)-block-poly(methyl acrylate)-block-polystyrene (PAA-b-PMA-b-PS) in the presence of 2,2'-(ethylenedioxy)diethylamine were studied by systematic variation of solvent composition and polystyrene block length. A partial phase diagram was constructed with various assemblies being identified and located. These assembled morphologies showed both traditional structures (reverse micelles, bulk-like aggregates, cylindrical micelles, and spherical micelles) and novel structures (toroidal micelles and disc-like micelles, etc). The triblock copolymer composition and sequence have been demonstrated to be critical for the formation of unique toroidal supramolecular nanostructures. Polyelectrolyte effects from the deprotonation of PAA by diamine, together with non-ionic interactions, were found to exert great influence under different solvent compositions to produce these rich morphologies. The mechanisms for formation of these morphologies are believed to be due, in large part, to a balancing of the interfacial curvature between the various domains within these assemblies. The understanding that has been gained can provide guidelines for the design and control of self-assembled and well-defined nanostructures. This solution-state amphiphilic polyelectrolyte triblock copolymer system, combining the long-range Coulombic interacting nature of polyelectrolytes and the short-range van der Waals order-forming ability of amphiphilic neutral block copolymers to produce size-controllable nano-objects having charged shells and ordered internal domains, might also provide a simple super- and supra-molecular model for the studies of synthetic mimics of complex biological systems.
520 $a The solid-state self assembly behaviors of these asymmetric ABC triblock copolymers were studied in a reduced dimension as thin films. Various long-range ordered structures were observed from a cylinder-forming ABC triblock copolymer, when cast as thin films upon different substrates. The first polymeric bottom layer adsorbed on the substrates was believed to be critical for the directionality of subsequent deposition of polymeric cylinders. Parallel orientations of hexagonally-packed polymeric cylinder arrays were found to be stable on a hydrophobic bottom layer. Release of conformational stress from the surface defects led to a perpendicular orientation of these cylinders being thermodynamically more favorable.
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790 $a 0252
790 1 0 $a Wooley, Karen L., $e advisor
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