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Application of Immobilized Amphiphil...

Hall, Desirae Loren.

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Application of Immobilized Amphiphilic (Hybrid) Molecular Brushes for Surface Control and Dynamic Response.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Application of Immobilized Amphiphilic (Hybrid) Molecular Brushes for Surface Control and Dynamic Response./
Author:	Hall, Desirae Loren.
Description:	178 p.
Notes:	Source: Dissertation Abstracts International, Volume: 75-11(E), Section: B.
Contained By:	Dissertation Abstracts International75-11B(E).
Subject:	Polymer chemistry. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3583469
ISBN:	9781321169850

Application of Immobilized Amphiphilic (Hybrid) Molecular Brushes for Surface Control and Dynamic Response.
Hall, Desirae Loren.

Application of Immobilized Amphiphilic (Hybrid) Molecular Brushes for Surface Control and Dynamic Response. - 178 p.

Source: Dissertation Abstracts International, Volume: 75-11(E), Section: B.

Thesis (Ph.D.)--University of the Sciences in Philadelphia, 2014.

There is a significant demand for novel materials that have medicinal and life science applications. Such novel materials can be realized by the use of molecular brushes. A molecular brush comprises a backbone polymer with side-chain polymers grafted to the backbone. The synthesis of molecular brushes allows for alteration of the properties of the polymers that compose the overall molecular brush or, in some cases, the introduction of new properties to either the backbone or side-chain polymers. Molecular brushes are expected to possess a complex of properties which, in turn, make them particularly suitable for many biomedical and cosmetic applications. More specifically, the modification of the biodegradable polymer chitosan (CHI) with non-biodegradable polyacrylamide (PAAm), via radical polymerization results in a polar molecular brush. In parallel, we have also developed a synthetic strategy to introduce polystyrene (PS) onto the main chain of chitosan which results in a non-polar molecular brush. After the respective modification of CHI with PAAm and PS, the concurrent modification of chitosan, using emulsion polymerization, with PAAm and PS, gives rise to an amphiphilic (hybrid) molecular brush. This hybrid molecular brush can be immobilized onto different types of surfaces and its surface properties can be investigated. Immobilized hybrid molecular brushes could demonstrate dynamic switching of polar and non-polar properties upon exposure to selective solvents; this is a good basis for environmentally responsive materials. Our study is focused on the in situ grafting of PAAm and PS onto the CHI backbone. Furthermore, we have performed series of experiments involving the synthesis of the hybrid molecular brush CHI-graft- PAAM- graft-PS; FTIR, NMR, SLS, GPC, AFM, null-ellipsometry and contact angle measurements will be used to characterize the products of these series. We demonstrate that our hybrid molecular brushes may be applied to cosmetics and hair surface studies.

ISBN: 9781321169850Subjects--Topical Terms:

3173488
Polymer chemistry.

Application of Immobilized Amphiphilic (Hybrid) Molecular Brushes for Surface Control and Dynamic Response.
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245 1 0 $a Application of Immobilized Amphiphilic (Hybrid) Molecular Brushes for Surface Control and Dynamic Response.
300 $a 178 p.
500 $a Source: Dissertation Abstracts International, Volume: 75-11(E), Section: B.
500 $a Advisers: Alexander Sidorenko; Preston B. Moore.
502 $a Thesis (Ph.D.)--University of the Sciences in Philadelphia, 2014.
520 $a There is a significant demand for novel materials that have medicinal and life science applications. Such novel materials can be realized by the use of molecular brushes. A molecular brush comprises a backbone polymer with side-chain polymers grafted to the backbone. The synthesis of molecular brushes allows for alteration of the properties of the polymers that compose the overall molecular brush or, in some cases, the introduction of new properties to either the backbone or side-chain polymers. Molecular brushes are expected to possess a complex of properties which, in turn, make them particularly suitable for many biomedical and cosmetic applications. More specifically, the modification of the biodegradable polymer chitosan (CHI) with non-biodegradable polyacrylamide (PAAm), via radical polymerization results in a polar molecular brush. In parallel, we have also developed a synthetic strategy to introduce polystyrene (PS) onto the main chain of chitosan which results in a non-polar molecular brush. After the respective modification of CHI with PAAm and PS, the concurrent modification of chitosan, using emulsion polymerization, with PAAm and PS, gives rise to an amphiphilic (hybrid) molecular brush. This hybrid molecular brush can be immobilized onto different types of surfaces and its surface properties can be investigated. Immobilized hybrid molecular brushes could demonstrate dynamic switching of polar and non-polar properties upon exposure to selective solvents; this is a good basis for environmentally responsive materials. Our study is focused on the in situ grafting of PAAm and PS onto the CHI backbone. Furthermore, we have performed series of experiments involving the synthesis of the hybrid molecular brush CHI-graft- PAAM- graft-PS; FTIR, NMR, SLS, GPC, AFM, null-ellipsometry and contact angle measurements will be used to characterize the products of these series. We demonstrate that our hybrid molecular brushes may be applied to cosmetics and hair surface studies.
590 $a School code: 1379.
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650 4 $a Materials science. $3 543314
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