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Interfacial structure and dynamics of polymeric materials. I. Perfluoropolyether lubricant on solid substrate. II. Two-dimensional self-assembly of linear-nanoparticle block copolymers

Record Type:	Electronic resources : Monograph/item
Title/Author:	Interfacial structure and dynamics of polymeric materials. I. Perfluoropolyether lubricant on solid substrate. II. Two-dimensional self-assembly of linear-nanoparticle block copolymers
Author:	Kim, Yoojin.
Description:	188 p.
Notes:	Advisers: Curtis W. Frank; Christopher A. Klug.
Notes:	Source: Dissertation Abstracts International, Volume: 65-04, Section: B, page: 1887.
Contained By:	Dissertation Abstracts International65-04B.
Subject:	Chemistry, Polymer.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3128662
ISBN:	0496759248

Interfacial structure and dynamics of polymeric materials. I. Perfluoropolyether lubricant on solid substrate. II. Two-dimensional self-assembly of linear-nanoparticle block copolymers
Kim, Yoojin.

Interfacial structure and dynamics of polymeric materials. I. Perfluoropolyether lubricant on solid substrate. II. Two-dimensional self-assembly of linear-nanoparticle block copolymers [electronic resource] - 188 p.

Advisers: Curtis W. Frank; Christopher A. Klug.

Thesis (Ph.D.)--Stanford University, 2004.

Carbon-13 and fluorine-19 solid-state NMR techniques have been used to compare the various backbone dynamics of Zdol in the bulk and in ultra-thin films. On a silica surface, the conformational transition of one segment is found to slow down indicating that the interaction of Zdol with the surface hinders such motion. However, the amplitude of the C-F bond libration is slightly increased on the surface due to the elimination of the cohesive interaction with the neighboring molecules. The longer-range motions involving more than one segment in a cooperative fashion are detected by the 19F spin-spin relaxation time (T2) that decreases by two orders of magnitude in thin films. The 19F line width increase and the downfield shift suggest that backbone interacts with the active binding sites of the amorphous carbon surface via electron donation from the ether oxygen lone pairs.

ISBN: 0496759248Subjects--Topical Terms:

227045
Chemistry, Polymer.

Interfacial structure and dynamics of polymeric materials. I. Perfluoropolyether lubricant on solid substrate. II. Two-dimensional self-assembly of linear-nanoparticle block copolymers
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245 1 0 $a Interfacial structure and dynamics of polymeric materials. I. Perfluoropolyether lubricant on solid substrate. II. Two-dimensional self-assembly of linear-nanoparticle block copolymers $h [electronic resource]
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500 $a Source: Dissertation Abstracts International, Volume: 65-04, Section: B, page: 1887.
502 $a Thesis (Ph.D.)--Stanford University, 2004.
520 # $a Carbon-13 and fluorine-19 solid-state NMR techniques have been used to compare the various backbone dynamics of Zdol in the bulk and in ultra-thin films. On a silica surface, the conformational transition of one segment is found to slow down indicating that the interaction of Zdol with the surface hinders such motion. However, the amplitude of the C-F bond libration is slightly increased on the surface due to the elimination of the cohesive interaction with the neighboring molecules. The longer-range motions involving more than one segment in a cooperative fashion are detected by the 19F spin-spin relaxation time (T2) that decreases by two orders of magnitude in thin films. The 19F line width increase and the downfield shift suggest that backbone interacts with the active binding sites of the amorphous carbon surface via electron donation from the ether oxygen lone pairs.
520 # $a We have studied two systems of thin polymer films on solid surfaces. The first study has examined the effects of surface confinement in the backbone dynamics of a hard disk drive lubricant, Zdol, on silica and amorphous carbon surfaces. The second study has allowed us to investigate the effect of architecture on the block copolymer self-assembly at the air-water interface and on a solid surface in a straightforward fashion.
520 # $a We have synthesized a series of poly(ethylene glycol)-b-(styrene- r-benzocyclobutene) block copolymers with different architectures. The linear block copolymer precursor and the linear-nanoparticle block copolymer resulting from selective intramolecular crosslinking of the benzocyclobutene units have exactly the same molecular weight and chemical composition, but different architectures. At the air-water interface, the block copolymers self-assemble into remarkably different surface aggregates. While the linear block copolymer forms disk-like surface assemblies, the linear-nanoparticle block copolymer exhibits long (>10 mum) worm-like aggregates whose length increases as a function of increasing crosslinking density. The driving forces for the morphological difference are discussed in terms of the different molecular geometry and the limited degree of stretching of the nanoparticle block. The surface pressure - area isotherm of the block copolymers at the air-water interface is interpreted in terms of the surface aggregates.
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