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Hydrogen-bonded side chain liquid cr...

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Hydrogen-bonded side chain liquid crystalline block copolymer: Molecular design, synthesis, characterization and applications.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Hydrogen-bonded side chain liquid crystalline block copolymer: Molecular design, synthesis, characterization and applications./
Author:	Chao, Chi-Yang.
Description:	214 p.
Notes:	Adviser: Christopher K. Ober.
Contained By:	Dissertation Abstracts International64-09B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3104548
ISBN:	9780496521159

Hydrogen-bonded side chain liquid crystalline block copolymer: Molecular design, synthesis, characterization and applications.
Chao, Chi-Yang.

Hydrogen-bonded side chain liquid crystalline block copolymer: Molecular design, synthesis, characterization and applications. - 214 p.

Adviser: Christopher K. Ober.

Thesis (Ph.D.)--Cornell University, 2003.

Block copolymers can self-assemble into highly regular, microphase-separated morphologies with dimensions at nanometer length scales. Potential applications such as optical wavelength photonic crystals, templates for nanolithographic patterning, or nanochannels for biomacromolecular separation take advantage of the well-ordered, controlled size microdomains of block copolymers. Side-chain liquid crystalline block copolymers (SCLCBCPs) are drawing increasing attention since the incorporation of liquid crystallinity turns their well-organized microstructures into dynamic functional materials. As a special type of block copolymer, hydrogen-bonded SCLCBCPs are unique, compositionally tunable materials with multiple dynamic functionalities that can readily respond to thermal, electrical and mechanical fields.

ISBN: 9780496521159Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Hydrogen-bonded side chain liquid crystalline block copolymer: Molecular design, synthesis, characterization and applications.
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020 $a 9780496521159
035 $a (UMI)AAI3104548
035 $a AAI3104548
040 $a UMI $c UMI
100 1 $a Chao, Chi-Yang. $3 1025133
245 1 0 $a Hydrogen-bonded side chain liquid crystalline block copolymer: Molecular design, synthesis, characterization and applications.
300 $a 214 p.
500 $a Adviser: Christopher K. Ober.
500 $a Source: Dissertation Abstracts International, Volume: 64-09, Section: B, page: 4560.
502 $a Thesis (Ph.D.)--Cornell University, 2003.
520 $a Block copolymers can self-assemble into highly regular, microphase-separated morphologies with dimensions at nanometer length scales. Potential applications such as optical wavelength photonic crystals, templates for nanolithographic patterning, or nanochannels for biomacromolecular separation take advantage of the well-ordered, controlled size microdomains of block copolymers. Side-chain liquid crystalline block copolymers (SCLCBCPs) are drawing increasing attention since the incorporation of liquid crystallinity turns their well-organized microstructures into dynamic functional materials. As a special type of block copolymer, hydrogen-bonded SCLCBCPs are unique, compositionally tunable materials with multiple dynamic functionalities that can readily respond to thermal, electrical and mechanical fields.
520 $a Hydrogen-bonded SCLCBCPs were synthesized and assembled from host poly(styrene- b-acrylic acid) diblock copolymers with narrow molecular weight distributions as proton donors and guest imidazole functionalized mesogenic moieties as proton acceptors. In these studies non-covalent hydrogen bonding is employed to connect mesogenic side groups to a block copolymer backbone, both for its dynamic character as well as for facile materials preparation. The homogeneity and configuration of the hydrogen-bonded complexes were determined by both the molecular architecture of imidazolyl side groups and the process conditions.
520 $a A one-dimensional photonic crystal composed of high molecular weight hydrogen-bonded SCLCBCP, with temperature dependent optical wavelength stop bands was successfully produced. The microstructures of hydrogen-bonded complexes could be rapidly aligned in an AC electric field at temperatures below the order-disorder transition but above their glass transitions. Remarkable dipolar properties of the mesogenic groups and thermal dissociation of hydrogen bonds are key elements to fast orientation switching. Studies of a wide range of mesogen and polymer combinations were carried out to investigate the interplay between morphology, mesophase behavior and blend composition (molar ratios of proton acceptors to proton donors). A critical composition for mesophase formation was identified and the characteristics of the H-bonded complexes below the critical blend ratios were very different than those above.
520 $a Hydrogen bonding was also used to direct microphase separation of miscible poly(hydroxystyrene-b-methyl methacrylate) diblock copolymer by adopting imidazolyl additives able to hydrogen bond with poly(hydroxystyrene). The miscibility between PHS and PMMA segments was diminished significantly by introducing small quantities of H-binding additives. The critical blend ratio for microphase separation was determined more by the molecular structure of the additives than the number of hydrogen bonds formed between PHS and additives.
590 $a School code: 0058.
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0495
690 $a 0794
710 2 $a Cornell University. $3 530586
773 0 $t Dissertation Abstracts International $g 64-09B.
790 $a 0058
790 1 0 $a Ober, Christopher K., $e advisor
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3104548