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Spatio-orientationally organized pol...

Kang, Shin-Woong.

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Spatio-orientationally organized polymer microstructures obtained on self-assembled pattern-forming states of liquid crystals: Morphology, phase separation, and potential applications.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Spatio-orientationally organized polymer microstructures obtained on self-assembled pattern-forming states of liquid crystals: Morphology, phase separation, and potential applications./
Author:	Kang, Shin-Woong.
Description:	273 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-07, Section: B, page: 3297.
Contained By:	Dissertation Abstracts International64-07B.
Subject:	Chemistry, Physical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3097194
ISBN:	0496448080

Spatio-orientationally organized polymer microstructures obtained on self-assembled pattern-forming states of liquid crystals: Morphology, phase separation, and potential applications.
Kang, Shin-Woong.

Spatio-orientationally organized polymer microstructures obtained on self-assembled pattern-forming states of liquid crystals: Morphology, phase separation, and potential applications. - 273 p.

Source: Dissertation Abstracts International, Volume: 64-07, Section: B, page: 3297.

Thesis (Ph.D.)--Kent State University, 2003.

The main objective of the dissertation is to develop and exploit a novel technique for imparting multidimensional spatial and orientational order into polymer networks. This approach is based on the use of pattern-forming states of liquid crystals as templates for the network formation. To demonstrate the feasibility and flexibility of this concept, we describe various pattern-forming states observed from ordinary cholesteric and nematic/cholesteric dual-frequency liquid crystals. We present a variety of polymer microstuctures templated on those pattern-forming states. This clearly demonstrates the feasibility and flexibility of templating both orientational and positional order of host pattern-forming states into polymer network.

ISBN: 0496448080Subjects--Topical Terms:

560527
Chemistry, Physical.

Spatio-orientationally organized polymer microstructures obtained on self-assembled pattern-forming states of liquid crystals: Morphology, phase separation, and potential applications.
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035 $a (UnM)AAI3097194
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100 1 $a Kang, Shin-Woong. $3 1935698
245 1 0 $a Spatio-orientationally organized polymer microstructures obtained on self-assembled pattern-forming states of liquid crystals: Morphology, phase separation, and potential applications.
300 $a 273 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-07, Section: B, page: 3297.
500 $a Director: Liang-Chy Chien.
502 $a Thesis (Ph.D.)--Kent State University, 2003.
520 $a The main objective of the dissertation is to develop and exploit a novel technique for imparting multidimensional spatial and orientational order into polymer networks. This approach is based on the use of pattern-forming states of liquid crystals as templates for the network formation. To demonstrate the feasibility and flexibility of this concept, we describe various pattern-forming states observed from ordinary cholesteric and nematic/cholesteric dual-frequency liquid crystals. We present a variety of polymer microstuctures templated on those pattern-forming states. This clearly demonstrates the feasibility and flexibility of templating both orientational and positional order of host pattern-forming states into polymer network.
520 $a We investigated possible driving forces behind this templating effect of LC pattern-forming states. These include effects of both spatial variations of UV intensity and gradients in elastic distortion caused by the spatial modulation of director field. The effects of the two mechanisms are separated through a series of experiments, including polarization-selective photopolymerization, FTIR imaging of the monomer distribution prior to UV-exposure and initiation of the photoreaction, the effect of temperature on the templated morphology, and the use of a thermal reactive monomer to remove the effect of possible optical inhomogeneities. The model derives from the concept of director gradient templating, whereby monomer phase separation is driven by a competition between reduction in elastic energy when monomer replaces liquid crystal in more (or less) distorted regions of the molecular director, and a consequent decrease in the entropy of mixing of the two species.
520 $a Another emphasis of this dissertation is to study the control over the network morphology in the "third" dimension---perpendicular to UV wavefront---by relatively simple means of selecting the wavelength of UV light used in photopolymerization to be inside or outside a carefully characterized absorption band. The spatial variation in polymerization rate with consequent diffusion of monomer results in surface-localized networks.
520 $a The final objective is to demonstrate potential applications of LC pattern-forming states and their templating effect, including switchable phase gratings, orientational/positional pattern formation of functional materials (e.g., conducting polymers), and potentiality of this novel interaction for future research.
590 $a School code: 0101.
650 4 $a Chemistry, Physical. $3 560527
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0494
690 $a 0495
690 $a 0794
710 2 0 $a Kent State University. $3 1017419
773 0 $t Dissertation Abstracts International $g 64-07B.
790 1 0 $a Chien, Liang-Chy, $e advisor
790 $a 0101
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3097194