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Toward a template for nanometer scale technology from block copolymers

Record Type:	Electronic resources : Monograph/item
Title/Author:	Toward a template for nanometer scale technology from block copolymers
Author:	Hahn, Hyeok.
Description:	149 p.
Notes:	Chair: Nitash P. Balsara.
Notes:	Source: Dissertation Abstracts International, Volume: 65-02, Section: B, page: 0882.
Contained By:	Dissertation Abstracts International65-02B.
Subject:	Engineering, Chemical.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3121510
ISBN:	0496688618

Toward a template for nanometer scale technology from block copolymers
Hahn, Hyeok.

Toward a template for nanometer scale technology from block copolymers [electronic resource] - 149 p.

Chair: Nitash P. Balsara.

Thesis (Ph.D.)--University of California, Berkeley, 2003.

In this study we seek a detailed understanding of the micro-structure and material-property relationships involved in the creation of templates made of block copolymers. The first topic deals with the effect of shear flow on the microstructure of block copolymers and the anisotropy in the physical properties of the resulting aligned (monodomain) microstructures. For this study, we used a polystyrene-polyisoprene (SI) block copolymer with lamellae morphology. The shear aligned lamellae exhibited a liquid-like rheological behavior (G' &sim; o2, G ″ &sim; o1 in the o → 0 limit) along the direction of lamellar layers. During the alignment procedure, we were able to observe that the organization of block copolymer chains into aligned lamellae leads to a reduction in both zero shear viscosity and recoverable compliance along the direction of the lamellar layers. In our system, the spontaneous formation of defects under quiescent conditions severely limited our characterization of the ordered state. Identifying block copolymer systems with stable defect-free states deserves further attention.

ISBN: 0496688618Subjects--Topical Terms:

226989
Engineering, Chemical.

Toward a template for nanometer scale technology from block copolymers
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245 1 0 $a Toward a template for nanometer scale technology from block copolymers $h [electronic resource]
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500 $a Source: Dissertation Abstracts International, Volume: 65-02, Section: B, page: 0882.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 2003.
520 # $a In this study we seek a detailed understanding of the micro-structure and material-property relationships involved in the creation of templates made of block copolymers. The first topic deals with the effect of shear flow on the microstructure of block copolymers and the anisotropy in the physical properties of the resulting aligned (monodomain) microstructures. For this study, we used a polystyrene-polyisoprene (SI) block copolymer with lamellae morphology. The shear aligned lamellae exhibited a liquid-like rheological behavior (G' &sim; o2, G ″ &sim; o1 in the o → 0 limit) along the direction of lamellar layers. During the alignment procedure, we were able to observe that the organization of block copolymer chains into aligned lamellae leads to a reduction in both zero shear viscosity and recoverable compliance along the direction of the lamellar layers. In our system, the spontaneous formation of defects under quiescent conditions severely limited our characterization of the ordered state. Identifying block copolymer systems with stable defect-free states deserves further attention.
520 # $a The second topic deals with the effect of cross-linking on the phase behavior and physical properties of the polystyrene-polyisoprene block copolymer. For this study, we used a polystyrene-polyisoprene block copolymer with a hexagonally-packed cylindrical morphology. To produce a model system which could easily be compared further to a theoretical framework, the cross-links were formed by randomly cross-linking the polyisoprene chains of a disordered polystyrene-polyisoprene block copolymer. A detailed analysis of the rheological behavior of a cross-linked polystyrene-polyisoprene block copolymer revealed an extra slow relaxation mode due to polystyrene (PS) chains which was observable above the glass transition temperature of the polystyrene microphase (T > 81°C). Also, at relatively low cross-link densities, the cross-linked SI block copolymer exhibited unusual softness. The origin of such an unusual softness lies in the dangling PS chains that were built into the PI-network due to the PI-selective nature of the cross-linking reaction of DCP. (Abstract shortened by UMI.)
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