In-Plane Nanostructural Organization of Copolymer Molecules along Polymer/Polymer Interfaces
共聚物分子沿聚合物/聚合物界面的面内纳米结构组织
基本信息
- 批准号:0756711
- 负责人:
- 金额:$ 10.51万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2008
- 资助国家:美国
- 起止时间:2008-08-01 至 2010-07-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
CBET-0756711SpontakThe In-Plane Nanostructural Organization of Copolymer Molecules along Polymer / Polymer Interfaces is critical to the development of advanced coatings, in which case the molecular-scale conditions responsible for promoting film stabilization must be fully established and understood. Most studies of this nature consider the interfaces to be laterally homogeneous, especially at long times. The PIs have recently found, however, that addition of an incompatible block copolymer or a core-shell polymer nanoparticle to a thin-film laminate induces discrete heterogeneities along the polymer / polymer interface, thereby indicating that lateral interfacial structuring plays an important role in compatibilization / stabilization. Previous results (i) raise fundamental questions regarding the competition between copolymer self-organization or nanoparticle aggregation and interfacial structuring as functions, and (ii) open new avenues to thin-film polymer laminates for coating and templating technologies. The long range objectives are to: (1.) Understand the type and extent of lateral structuring of diblock copolymers at interfaces between two immiscible homopolymers and how lateral interfacial structuring develops. While most previous studies have concentrated on exploring copolymer structure normal to the interface between two immiscible homopolymers, their previous results demonstrate that such structuring can be highly heterogeneous. In a thin-film laminate, such interfacial heterogeneities may adversely affect thin-film stability. The in-plane structure variations of copolymer molecules along the interface provide experimental evidence of discrete lateral interfacial structuring and warrant in-depth examination. (2.) Utilize the observed phenomena as a controllable means of large-area assembly and patterning of polymer surfaces. The PIs have observed that CSP nanoparticles preferentially segregate to polymer / polymer interfaces, and the extent to which they protrude from the film depends sensitively on the Surface / interfacial energy. The ON/OFF position of these CSP nanoparticles, triggered by a change in surface energy, and the simultaneous capability of organized in-plane structure would make such system convenient candidates for active reflective surfaces and smart tags. An improved understanding of the material and environmental factors governing interfacial structuring is needed. (3.) Interrogate the spatiotemporal organization of block copolymers and CSP nanoparticles at interfaces between two immiscible polymers to acquire valuable guidance in designing efficient interfacial reinforcing and compatibilizing agents. While block copolymers are widely established as macromolecular surfactants, little is known about the early stages of the reinforcing mechanism, far from equilibrium. The PIs past experiments show that the organization of block copolymer molecules or CSP nanoparticles at interfaces cannot be perceived as a simple '1D" problem since discrete in-plane features exist. Understanding the spatiotemporal behavior of such structure is crucial in identifying optimal conditions for compatibilization in relevant polymer systems (blends and thin films). This project will result in a graduate student being trained to (i) use state-of-the-art analytical methods to investigate thin-film polymer laminates and (ii) develop design and problem-solving skills to generate and analyze, in reproducible, meaningful and insightful fashion, the multicomponent systems outlined in this proposal. As part of his/her graduate program, the student will be required to give two presentation Updates / semester to improve his/her communication and presentation skills in preparation for conference meetings. The PI is currently initiating an international undergraduate senior design program within the NC State College of Engineering and will involve international student teams with this project. The student involved in this project will work closely with students at the Centennial Middle School located on the NC State Centennial Campus for this purpose. Lastly, the PI and co-PI have both been selected, on the basis of a University-wide competition, as mentors for undergraduate Beckman Scholars, and so the research will be augmented with a fully supported, undergraduate research assistant. The scholarly results generated during the course of this project will be disseminated through traditional modes, such as oral/poster presentations at scientific meetings and publication in high-impact scientific journals. Results from this research will be included in two graduate-level courses on blends and interfaces.
CBET-0756711海绵聚合物分子沿聚合物/聚合物界面的平面纳米结构组织对先进涂料的开发至关重要,在这种情况下,必须充分建立和了解促进膜稳定的分子尺度条件。大多数这种性质的研究认为界面是横向均匀的,特别是在很长一段时间内。然而,PI最近发现,在薄膜叠层中加入不相容的嵌段共聚物或核-壳聚合物纳米颗粒会导致聚合物/聚合物界面上的离散非均质性,从而表明横向界面结构在增容/稳定中起着重要作用。以前的结果(I)提出了关于共聚自组织或纳米粒子聚集和界面结构之间作为功能的竞争的基本问题,以及(Ii)为涂层和模板技术的薄膜聚合物层压板开辟了新的途径。远景目标是:(1)了解两嵌段共聚物在两个不相容的均聚物之间界面的侧向结构的类型和程度,以及侧向界面结构如何发展。虽然以前的大多数研究都集中在探索垂直于两个不相容的均聚物之间界面的共聚物结构,但他们之前的结果表明,这种结构可以是高度非均相的。在薄膜层压板中,这种界面不均匀可能会对薄膜的稳定性产生不利影响。共聚分子沿界面的面内结构变化提供了离散的横向界面结构的实验证据,值得深入研究。(2)利用观察到的现象作为聚合物表面大面积组装和图案化的可控手段。PI已经观察到CSP纳米粒子优先分离到聚合物/聚合物界面,并且它们从膜中突出的程度敏感地取决于表面/界面能。这些由表面能量变化触发的CSP纳米粒子的开/关位置,以及有组织的平面内结构的同时能力,将使这种系统成为主动反射表面和智能标签的候选系统。需要对控制界面结构的材料和环境因素有更好的理解。(3)研究嵌段共聚物和CSP纳米粒子在两不相容聚合物界面上的时空结构,为设计有效的界面增强剂和增容剂提供有价值的指导。虽然嵌段共聚物被广泛地确定为大分子表面活性剂,但对其增强机理的早期阶段知之甚少,远未达到平衡。过去的PI实验表明,由于存在离散的面内特征,嵌段共聚分子或CSP纳米颗粒在界面上的组织不能被视为简单的1D问题。了解这种结构的时空行为对于确定相关聚合物体系(共混物和薄膜)相容的最佳条件至关重要。该项目将培训研究生(I)使用最先进的分析方法来研究薄膜聚合物层压板,以及(Ii)开发设计和解决问题的技能,以可重复、有意义和有洞察力的方式生成和分析本提案中概述的多组分系统。作为研究生课程的一部分,学生将被要求每学期更新两次演讲,以提高他/她的沟通和演讲技能,为会议做准备。PI目前正在北卡罗来纳州立工程学院内启动一个国际本科生高级设计课程,并将邀请国际学生团队参与这个项目。参与该项目的学生将与位于北卡罗来纳州百年校区的百年中学的学生密切合作,为此目的。最后,在大学范围内的竞争的基础上,PI和共同PI都被选为本科生Beckman学者的导师,因此这项研究将得到一名得到充分支持的本科生研究助理的支持。在该项目过程中产生的学术成果将通过传统方式传播,例如在科学会议上作口头/海报陈述,并在影响较大的科学期刊上发表文章。这项研究的结果将包括在关于混合物和界面的两门研究生水平课程中。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Richard Spontak其他文献
Richard Spontak的其他文献
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{{ truncateString('Richard Spontak', 18)}}的其他基金
Magnetically-Driven Orientation of Multiphase Polymer Systems: A Ligand-Functionalized, Magnetic Nanoparticle Approach
多相聚合物系统的磁驱动取向:配体功能化的磁性纳米粒子方法
- 批准号:
0967559 - 财政年份:2010
- 资助金额:
$ 10.51万 - 项目类别:
Continuing Grant
REG: Cryomicroscopical Studies of Polymer and Surfactant Association Structures
REG:聚合物和表面活性剂缔合结构的冷冻显微镜研究
- 批准号:
9412361 - 财政年份:1994
- 资助金额:
$ 10.51万 - 项目类别:
Standard Grant
SGER: Polarization Near-Field Scanning Optical Microscopy of Ordered Polymers
SGER:有序聚合物的偏振近场扫描光学显微镜
- 批准号:
9315676 - 财政年份:1993
- 资助金额:
$ 10.51万 - 项目类别:
Standard Grant
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