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Synthesis of polyisoprene and polyis...

Germack, David Sam.

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Synthesis of polyisoprene and polyisoprene-containing amphiphilic block copolymers via RAFT for the preparation of nanoparticles with regioselective functional domains.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Synthesis of polyisoprene and polyisoprene-containing amphiphilic block copolymers via RAFT for the preparation of nanoparticles with regioselective functional domains./
作者:	Germack, David Sam.
面頁冊數:	145 p.
附註:	Adviser: Karen L. Wooley.
Contained By:	Dissertation Abstracts International68-09B.
標題:	Chemistry, Polymer. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3282406
ISBN:	9780549245544

Synthesis of polyisoprene and polyisoprene-containing amphiphilic block copolymers via RAFT for the preparation of nanoparticles with regioselective functional domains.
Germack, David Sam.

Synthesis of polyisoprene and polyisoprene-containing amphiphilic block copolymers via RAFT for the preparation of nanoparticles with regioselective functional domains. - 145 p.

Adviser: Karen L. Wooley.

Thesis (Ph.D.)--Washington University in St. Louis, 2007.

This dissertation describes homo-, di-, and triblock copolymers prepared via reversible addition-fragmentation chain-transfer (RAFT) controlled radical polymerization and their use as building blocks, programmed for self assembly and regioselective crosslinking chemistries. Conditions were developed for these polymerizations to include polyisoprene segments as unique reactive components. The preparation of discrete nanoscale particles, based upon the self assembly of these block copolymers in selective solvents and their covalent stabilization via regioselective chemistries, is also described.

ISBN: 9780549245544Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Synthesis of polyisoprene and polyisoprene-containing amphiphilic block copolymers via RAFT for the preparation of nanoparticles with regioselective functional domains.
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245 1 0 $a Synthesis of polyisoprene and polyisoprene-containing amphiphilic block copolymers via RAFT for the preparation of nanoparticles with regioselective functional domains.
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500 $a Adviser: Karen L. Wooley.
500 $a Source: Dissertation Abstracts International, Volume: 68-09, Section: B, page: 5986.
502 $a Thesis (Ph.D.)--Washington University in St. Louis, 2007.
520 $a This dissertation describes homo-, di-, and triblock copolymers prepared via reversible addition-fragmentation chain-transfer (RAFT) controlled radical polymerization and their use as building blocks, programmed for self assembly and regioselective crosslinking chemistries. Conditions were developed for these polymerizations to include polyisoprene segments as unique reactive components. The preparation of discrete nanoscale particles, based upon the self assembly of these block copolymers in selective solvents and their covalent stabilization via regioselective chemistries, is also described.
520 $a The effect of the solution-state nanoscale structure on the assembly of micropatterns by solvent evaporation using the novel amphiphilic diblock copolymer, poly(styrene-alt-maleic anhydride)-b-polyisoprene, as a building block for inverse micelles was studied. The inverse micelles were covalently stabilized in the core, creating core crosslinked nanoparticles (CCNPs), and in the shell, resulting in large crosslinked aggregates (LCAs). Micropatterned films were prepared by deposition and evaporation of a solution containing the diblock copolymer or the nanoscale structures (inverse micelle, LCA, and CCNP). The formation of regular micropatterns and the nanoscale surface topography was controlled by pre-establishment of the block copolymer phase segregation into well-defined core-shell nanoassemblies in solution.
520 $a The polymerization of isoprene via RAFT was examined in detail by preparation of polyisoprene in the presence of the trithiocarbonate transfer agent S-1-dodecyl-S'-(r,r'-dimethylr"-acetic acid)trithiocarbonate and t-butyl peroxide as the radical initiator. Kinetic studies of this polymerization under optimized conditions were performed in triplicate. These studies demonstrated the living nature of the polymerization and chain-extension with styrene demonstrated retention of the living chain-end functionality.
520 $a Studies of linear ABC and ACB triblock copolymers prepared from tert-butyl acrylate, isoprene and styrene, were also conducted. Poly( tert-butyl acrylate) was prepared and used as a macromolecular RAFT agent for both topological isomers, poly(tert-butyl acrylate)- b-polyisoprene-b-polystyrene (ABC) and poly( tert-butyl acrylate)-b-polystyrene-b-polyisoprene (ACB).
520 $a The atom-efficient preparation of poly(acrylic acid)-b-polyisoprene via RAFT by sequential polymerization of acrylic acid and isoprene and subsequent self assembly of this amphiphilic block copolymer into discrete nanoscale micelles was also performed. This most recent work is significant in its approach to overcome the need for acrylic acid protecting groups during polymerization. Highly efficient preparation of amphiphilic block copolymers was, thereby, realized.
520 $a Overall, the studies of this dissertation research have demonstrated the ability to prepare functional block copolymers with control over polymer topology and composition. Additionally, polyisoprene-containing block copolymers were prepared directly, with a high degree of control and presentation of functionality, via the versatile RAFT method.
590 $a School code: 0252.
650 4 $a Chemistry, Polymer. $3 1018428
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710 2 $a Washington University in St. Louis. $3 1017519
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790 1 0 $a Wooley, Karen L., $e advisor
791 $a Ph.D.
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