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Phase behavior of model ABC triblock...
~
Chatterjee, Joon.
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Phase behavior of model ABC triblock copolymers.
紀錄類型:
書目-語言資料,印刷品 : Monograph/item
正題名/作者:
Phase behavior of model ABC triblock copolymers./
作者:
Chatterjee, Joon.
面頁冊數:
272 p.
附註:
Adviser: Frank S. Bates.
Contained By:
Dissertation Abstracts International68-09B.
標題:
Chemistry, Polymer. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3278306
ISBN:
9780549229544
Phase behavior of model ABC triblock copolymers.
Chatterjee, Joon.
Phase behavior of model ABC triblock copolymers.
- 272 p.
Adviser: Frank S. Bates.
Thesis (Ph.D.)--University of Minnesota, 2007.
The phase behavior of poly(isoprene-b-styrene- b-ethylene oxide) (ISO), a model ABC triblock copolymer has been studied. This class of materials exhibit self-assembly, forming a large array of ordered morphologies at length scales of 5-100 nm. The formation of stable three-dimensionally continuous network morphologies is of special interest in this study. Since these nanostructures considerably impact the material properties, fundamental knowledge for designing ABC systems have high technological importance for realizing applications in the areas of nanofabrication, nanoporous media, separation membranes, drug delivery and high surface area catalysts.
ISBN: 9780549229544Subjects--Topical Terms:
1018428
Chemistry, Polymer.
Phase behavior of model ABC triblock copolymers.
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Source: Dissertation Abstracts International, Volume: 68-09, Section: B, page: 6128.
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Thesis (Ph.D.)--University of Minnesota, 2007.
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The phase behavior of poly(isoprene-b-styrene- b-ethylene oxide) (ISO), a model ABC triblock copolymer has been studied. This class of materials exhibit self-assembly, forming a large array of ordered morphologies at length scales of 5-100 nm. The formation of stable three-dimensionally continuous network morphologies is of special interest in this study. Since these nanostructures considerably impact the material properties, fundamental knowledge for designing ABC systems have high technological importance for realizing applications in the areas of nanofabrication, nanoporous media, separation membranes, drug delivery and high surface area catalysts.
520
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A comprehensive framework was developed to describe the phase behavior of the ISO triblock copolymers at weak to intermediate segregation strengths spanning a wide range of composition. Phases were characterized through a combination of characterization techniques, including small angle x-ray scattering, dynamic mechanical spectroscopy, transmission electron microscopy, and birefringence measurements. Combined with previous investigations on ISO, six different stable ordered state symmetries have been identified: lamellae (LAM), Fddd orthorhombic network (O70), double gyroid (Q230), alternating gyroid (Q214), hexagonal (HEX), and body-centered cubic (BCC). The phase map was found to be somewhat asymmetric around the fI = fO isopleth. This work provides a guide for theoretical studies and gives insight into the intricate effects of various parameters on the self-assembly of ABC triblock copolymers. Experimental SAXS data evaluated with a simple scattering intensity model show that local mixing varies continuously across the phase map between states of two- and three-domain segregation.
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Strategies of blending homopolymers with ISO triblock copolymer were employed for studying the swelling properties of a lamellar state. Results demonstrate that lamellar domains swell or shrink depending upon the type of homopolymer that was mixed. The results provide insight into the chain conformation of ABC triblock copolymers, where the B blocks are completely bridged across the adjacent A and C domains. In the final part of the thesis, the swelling properties were used to study the directed assembly of ABC triblock copolymers on chemically nanopatterned surfaces.
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http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3278306
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