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Hybrid macrocycles for supramolecula...

Watson, Walter Philip.

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Hybrid macrocycles for supramolecular assemblies.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Hybrid macrocycles for supramolecular assemblies./
作者:	Watson, Walter Philip.
面頁冊數:	145 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1495.
Contained By:	Dissertation Abstracts International66-03B.
標題:	Chemistry, Polymer. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3170120
ISBN:	0542063158

Hybrid macrocycles for supramolecular assemblies.
Watson, Walter Philip.

Hybrid macrocycles for supramolecular assemblies. - 145 p.

Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1495.

Thesis (Ph.D.)--Georgia Institute of Technology, 2005.

Hybrid macrocycles, which chimerically integrate multiple chemical compositions and architectures, provide an effective way to impart new properties to polymers that are not found in their linear or homocyclic analogues. This dissertation addresses the incorporation of hydrophilic blocks into hydrophobic polymer, as either a poly(dimethyl siloxane)-block-poly(oxyethylene) (PDMS-POE) tadpole with a hydrophobic "head" and a hydrophilic "tail" or as a diblock poly(styrene)-block-diethylene glycol (PS-DEG) hydrophobic-hydrophilic macrocycle. The supramolecular association properties of both kinds of cycles were studied: the PDMS-POE tadpoles in forming micelles, and the PS-DEG macrocycles in threading with linear polymer to form polyrotaxanes.

ISBN: 0542063158Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Hybrid macrocycles for supramolecular assemblies.
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500 $a Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1495.
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502 $a Thesis (Ph.D.)--Georgia Institute of Technology, 2005.
520 $a Hybrid macrocycles, which chimerically integrate multiple chemical compositions and architectures, provide an effective way to impart new properties to polymers that are not found in their linear or homocyclic analogues. This dissertation addresses the incorporation of hydrophilic blocks into hydrophobic polymer, as either a poly(dimethyl siloxane)-block-poly(oxyethylene) (PDMS-POE) tadpole with a hydrophobic "head" and a hydrophilic "tail" or as a diblock poly(styrene)-block-diethylene glycol (PS-DEG) hydrophobic-hydrophilic macrocycle. The supramolecular association properties of both kinds of cycles were studied: the PDMS-POE tadpoles in forming micelles, and the PS-DEG macrocycles in threading with linear polymer to form polyrotaxanes.
520 $a For the PDMS-POE macrocycle, linear alpha,omega-dihydroxy PDMS was cyclized under dilute conditions with dichloromethylhydrosilane as a linking group to produce hydrosilane-functionalized cyclic PDMS. This was joined to alpha-methoxy,omega-allyl POE via a free radical hydrosilylation reaction to produce the hybrid tadpole macrocycle, which was analyzed by GPC, DSC, and 1H, 13C, and 29Si NMM spectroscopy. Supramolecular aggregation consisting of the formation of micelles under both polar and nonpolar conditions was studied by surface tensiometry and quasielastic light scattering. For the PS-DEG macrocycle, linear alpha,omega-dihydroxy PS was prepared by ATRP polymerization of styrene, followed by reaction with KOH to give hydroxyl endgroups. The linear PS was then cyclized under dilute conditions with diethylene glycol ditosylate, and the product was analyzed by GPC, MALDI-TOF MS, DSC, and 1H, 13C and DOSY NMR spectroscopy. The macrocycle was then statistically threaded with linear PS to give the supramolecular structure poly(styrene)-rotaxa-cyclo[poly(styrene)-blockdiethylene glycol]. Characterization was performed with DOSY NMR to verify that the product was threaded, and 1H NMR was collected to determine that the product was 13% macrocycle by weight. DSC showed only one Tg, indicating that the linear and cyclic species were present in the same phase.
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