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Temperature-responsive polymers with...

Zhuk, Aliaksandr.

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Temperature-responsive polymers within layer-by-layer assemblies.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Temperature-responsive polymers within layer-by-layer assemblies./
作者:	Zhuk, Aliaksandr.
面頁冊數:	158 p.
附註:	Source: Dissertation Abstracts International, Volume: 74-11(E), Section: B.
Contained By:	Dissertation Abstracts International74-11B(E).
標題:	Chemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3568513
ISBN:	9781303230530

Temperature-responsive polymers within layer-by-layer assemblies.
Zhuk, Aliaksandr.

Temperature-responsive polymers within layer-by-layer assemblies. - 158 p.

Source: Dissertation Abstracts International, Volume: 74-11(E), Section: B.

Thesis (Ph.D.)--Stevens Institute of Technology, 2013.

The layer-by-layer (LbL) technique is one of the core areas of growth in the development of nanostructured films for surface functionalization or their use as free-standing membranes. Due to numerous advantages of LbL assemblies such as highly tunable architectures and properties, there has been growing interest in using LbL assemblies for a variety of applications, including, but not limited to, drug delivery, sensing and separation, tissue engineering and fuel cells.

ISBN: 9781303230530Subjects--Topical Terms:

516420
Chemistry.

Temperature-responsive polymers within layer-by-layer assemblies.
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100 1 $a Zhuk, Aliaksandr. $3 3180150
245 1 0 $a Temperature-responsive polymers within layer-by-layer assemblies.
300 $a 158 p.
500 $a Source: Dissertation Abstracts International, Volume: 74-11(E), Section: B.
500 $a Adviser: Svetlana A. Sukhishvili.
502 $a Thesis (Ph.D.)--Stevens Institute of Technology, 2013.
520 $a The layer-by-layer (LbL) technique is one of the core areas of growth in the development of nanostructured films for surface functionalization or their use as free-standing membranes. Due to numerous advantages of LbL assemblies such as highly tunable architectures and properties, there has been growing interest in using LbL assemblies for a variety of applications, including, but not limited to, drug delivery, sensing and separation, tissue engineering and fuel cells.
520 $a This dissertation examines fundamental aspects of temperature effects on structure and water uptake of the hydrogen-bonded LbL assemblies of temperature-responsive neutral polymers, such as poly(N-isopropylacrylamide) (PNIPAM), poly(N-vinylcaprolactam) (PVCL), poly(vinyl methyl ether) (PVME), or poly(acrylamide) (PAAm), with a polycarboxylic acid such as poly(acrylic acid) (PAA), poly(methacrylic acid) (PMAA), or poly(ethacrylic acid) (PEAA). Specifically, we have shown that the temperature has a significant effect on film properties. The proximity of the self-assembly or post-self-assembly temperature to the critical temperature of phase separation of a neutral polymer from solution resulted in higher pH stability for multilayers.
520 $a Secondly, the work was extended to electrostatically assembled micelle-containing LbL films of poly(2-(dimethylamino)ethyl methacrylate)-block-poly(N-isopropylacryl-amide) (PNIPAM-b-PDMA) block copolymer micelles (BCMs) alternately assembled with poly(4-styrene sulfonate) (PSS). By applying neutron reflectometry (NR), we investigated the degree of layer interpenetration and quantified water distribution within LbL assemblies of variable architecture.
520 $a Finally, we fabricated LbL films responsive to multiple stimuli. Temperature- and salt-responsive films were constructed using PNIPAM and montmorillonite clay nanosheets. An additional pH response was achieved by depositing and cross-linking hybrid, dual-network PNIPAM/clay/PNIPAM/PMAA multilayers. Both types of films remained stable in a wide pH range and were highly swollen. PNIPAM/clay films swelled up to 14.5 times their dry film thickness in low-salt solutions at 25 °C, as shown by laser scanning confocal microscopy. At temperatures higher than PNIPAM's lower critical solution temperature (LCST) of 32 °C both PNIPAM/clay and PNIPAM/clay/PNIPAM/PMAA films reversibly deswelled as a result of collapse of PNIPAM chains. Films of both types showed a decrease in permeability to fluorescein-tagged dextrans of various molecular weights. Importantly, film permeability to dextrans was decreased at temperatures above PNIPAM's LCST, and the effect could be reversed by lowering the temperature.
590 $a School code: 0733.
650 4 $a Chemistry. $3 516420
650 4 $a Polymer chemistry. $3 3173488
690 $a 0485
690 $a 0495
710 2 $a Stevens Institute of Technology. $b Schaefer School of Engineering and Science. $3 3180151
773 0 $t Dissertation Abstracts International $g 74-11B(E).
790 $a 0733
791 $a Ph.D.
792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3568513