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Synthesis and characterization of no...

Viswanathan, Kalpana.

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Synthesis and characterization of novel polymers for functional and stimuli responsive silicon surfaces.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Synthesis and characterization of novel polymers for functional and stimuli responsive silicon surfaces./
作者:	Viswanathan, Kalpana.
面頁冊數:	289 p.
附註:	Adviser: Thomas C. Ward.
Contained By:	Dissertation Abstracts International67-02B.
標題:	Chemistry, Polymer. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3207992
ISBN:	9780542557545

Synthesis and characterization of novel polymers for functional and stimuli responsive silicon surfaces.
Viswanathan, Kalpana.

Synthesis and characterization of novel polymers for functional and stimuli responsive silicon surfaces. - 289 p.

Adviser: Thomas C. Ward.

Thesis (Ph.D.)--Virginia Polytechnic Institute and State University, 2006.

The use of polymers as surface modifiers enables control over many variables such as film thickness, chemical composition and areal density of functional groups. The synthesis of a variety of novel functionalized polymers using living polymerization techniques to achieve functional and stimuli responsive coatings on silica surfaces are described. Since microscopic features on a surface influence the overall wetting properties of the surface, a systematic investigation of the influence of polymer architecture on the microscopic characteristics of the modified surfaces was studied using silane-functionalized linear and novel star-branched polystyrene (PS). Star-branched modifiers provide functional and relatively well-defined model systems for probing surface properties compared to ill-defined highly branched systems and synthetically challenging dendrimers. Using these simple star-shaped macromolecules it was shown that the topographies of the polymer-modified surfaces were influenced by the polymer architecture. A model explaining the observed surface features was proposed.

ISBN: 9780542557545Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Synthesis and characterization of novel polymers for functional and stimuli responsive silicon surfaces.
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100 1 $a Viswanathan, Kalpana. $3 1287263
245 1 0 $a Synthesis and characterization of novel polymers for functional and stimuli responsive silicon surfaces.
300 $a 289 p.
500 $a Adviser: Thomas C. Ward.
500 $a Source: Dissertation Abstracts International, Volume: 67-02, Section: B, page: 0919.
502 $a Thesis (Ph.D.)--Virginia Polytechnic Institute and State University, 2006.
520 $a The use of polymers as surface modifiers enables control over many variables such as film thickness, chemical composition and areal density of functional groups. The synthesis of a variety of novel functionalized polymers using living polymerization techniques to achieve functional and stimuli responsive coatings on silica surfaces are described. Since microscopic features on a surface influence the overall wetting properties of the surface, a systematic investigation of the influence of polymer architecture on the microscopic characteristics of the modified surfaces was studied using silane-functionalized linear and novel star-branched polystyrene (PS). Star-branched modifiers provide functional and relatively well-defined model systems for probing surface properties compared to ill-defined highly branched systems and synthetically challenging dendrimers. Using these simple star-shaped macromolecules it was shown that the topographies of the polymer-modified surfaces were influenced by the polymer architecture. A model explaining the observed surface features was proposed.
520 $a A living polymerization strategy was also used to synthesize centrally functionalized amphiphilic triblock copolymers, where the central functionalized block covalently anchored the copolymers to silica surfaces. The amphiphilic copolymers exhibited stimuli responsive changes in surface hydrophobicity. In spite of multiple solvent exposures, the copolymer films remained stable on the surface indicating that the observed changes in surface properties were due to selective solvent induced reversible rearrangement of the copolymer blocks. The chemical composition of the copolymers was tailored in order to tune the response time of the surface anchored polymer chains. Thus, the polymer coatings were used to reversibly change the surface polarities in an on-demand fashion and could find possible applications as smart adhesives, sensors and reusable membrane devices.
520 $a In contrast to the afore-mentioned covalent modification approach, which often leads to permanent modification of surfaces, renewable surfaces exhibiting "universal" adhesion properties were also obtained through non-covalent modification. By employing hydrogen bonding interactions between DNA bases, surfaces functionalized with adenine groups were found to reversibly associate with thymine-functionalized polymers. This study describing the solvato-reversible polymer coating was the first demonstration on silica surfaces. A systematic investigation of the influence of surface concentration of the multiple hydrogen bonding groups and their structure on the extent of polymer recognition by the modified surfaces is also presented.
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