| 项目编号: | 1512221
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| 项目名称: | UNS: Organization and Interfacial Interactions of Surface-tethered Layers of Semiflexible Polymer Chains |
| 作者: | S. Michael Kilbey
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| 承担单位: | University of Tennessee Knoxville
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| 批准年: | 2014
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| 开始日期: | 2015-06-15
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| 结束日期: | 2018-05-31
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| 资助金额: | USD281502
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| 资助来源: | US-NSF
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| 项目类别: | Standard Grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Engineering - Chemical, Bioengineering, Environmental, and Transport Systems
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| 英文关键词: | chain stiffness
; polymer
; chain microstructure
; interfacial behavior
; orientation interaction
; s. michaelpolymers
; biological polymer
; chain rigidity
; polymer chain
; constituent polymer
; novel end-functional polymer
; semi flexible polymer
; pbf chain
; interface
; thermodynamic interaction
; interfacial layer
; semiflexible polymer
; polymer synthesis
; interfacial structure
; pbf
; polymer-modified interface
; property
; flexible chain
|
| 英文摘要: | 1512221 - Kilbey, S. Michael
Polymers are widely encountered in daily life, and the structure and properties of their interfaces dictate their use and functioning in many applications. In most situations, the constituent polymers are considered to be coiled, flexible chains that adopt a variety of configurations of equal energy. However, when polymer chains are made of repeat units that give rise to chain stiffness, restrictions in configuration and resistance to bending lead to drastically different structures and behaviors. The proposed research project aims to investigate how those fundamental differences in chain stiffness impact interfacial structure and properties. To accomplish this research, a new type of polymer that enables chain microstructure, and therefore chain stiffness, to be tuned through synthetic chemistry will be synthesized, tethered to interfaces, and the resultant structure and properties will be measured using a variety of techniques capable of probing structure at the nanoscale. Results from this research will catalyze new thinking into how to rationally design polymer-modified interfaces that are useful in applications ranging from structural nanocomposite materials to advanced energy systems.
A comprehensive research program encompassing polymer synthesis, interface modification and surface structure and property characterization is planned. Novel end-functional polymers based on poly (benzofulvene) (PBF), which enables chain microstructure to be tuned through synthetic chemistry, thereby setting chain stiffness and mobility, will be synthesized and characterized. Interfacial layers of PBFs will be made by reactive modification of activated surfaces, and the organization, structural response to solvents of different quality, and surface energy of those PBF "brushes" on flat surfaces will be investigated as a function of molecular weight, microstructure, and areal density of chains. The wetting behavior of PBF brushes coated with thin films of PBF chains will be examined to reveal how packing, arrangement, and microstructure dictate thermodynamic interactions across interfaces. The structure-property relationships resulting from sets of systematic studies will provide new foundational knowledge of the interfacial behaviors of semi flexible polymers, which is transformative not only because it addresses a research area that is largely vacant of experimental insights, but also because it establishes a basis for developing advanced nanocomposites that expand the boundaries of materials-property space.
Semiflexible polymers are an important but under-studied class of materials that are relevant to biological polymers, conjugated polymers used in energy conversion, and mechanically robust synthetic filaments. A clear understanding of how chain stiffness and orientation interactions affect thermodynamic behaviors and interfacial structure is essential to support continue technological advances in those areas, as well as to develop new nanocomposites that make use of toughness and improved dispersion provided by chain rigidity. In addition to training graduate and undergraduate students, researchers engaged in this program will participate in outreach and education initiatives aimed at middle school students. These activities have goals of fostering personal and professional growth in young learners through mentoring and hands-on experimentation, inspiring curiosity and interest in careers in engineering and science, and promoting diversity. These will be augmented by engagement of a high school teacher in an authentic research experience, and results from all activities will be shared through publications and presentations at local and national conferences. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/94401
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| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
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| Recommended Citation: | |
S. Michael Kilbey. UNS: Organization and Interfacial Interactions of Surface-tethered Layers of Semiflexible Polymer Chains. 2014-01-01.
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