Elucidating Grain Boundary Complexion Transitions and their Role on Grain Growth in Granular Block Copolymer Microstructures

阐明晶界复杂转变及其对颗粒嵌段共聚物微结构中晶粒生长的作用

基本信息

批准号：
1709344
负责人：
Michael Bockstaller
金额：
$ 23万
依托单位：
Carnegie-Mellon University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-07-01 至 2020-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1709344&HistoricalAwards=false
关键词：
Elucidating Grain Boundary Complexion Transitions

项目摘要

NON-TECHNICAL SUMMARYBlock copolymers are materials that are capable of self-organizing into functional nanostructures that are of technological relevance in applications ranging from membranes for water purification to next-generation lithium ion batteries to high-performance polymer photovoltaics. The realization of these technologies is hindered by defects in block copolymer nanostructures that form during the self-organization process and that reduce the properties of materials. The goal of this project is to establish a transformative new process to control and reduce the number of defects in block copolymer nanostructures. This will promote the development of scalable and economic fabrication processes for materials with improved properties. The program will support the teaching of a new laboratory course on polymer materials and provide training for one graduate student and several undergraduate student researchers. Ongoing collaborations with educators at minority serving institutions will be leveraged to support the participation of minority students. Finally, the potential of novel educational technologies based on 'haptic human-computer interactions' as a means to engage and attract middle and high school students to the study of science and engineering will be established. TECHNICAL SUMMARYThe fabrication of large-grained microstructures with reduced defect densities presents a prerequisite to the application of block copolymer (BCP) materials across a wide range of innovative material technologies. Understanding of the mechanism of grain growth and the evolution of defect structures during the annealing process is therefore a subject that is of fundamental relevance to both the science and engineering of BCP-based materials. The objective of this project is to elucidate the role of filler-matrix interactions on grain coarsening in miscible BCP/homopolymer blends and to test the hypothesis that grain boundary complexion transitions -- i.e. transitions within the phase of filler that is segregated to grain boundary interfaces -- increase the driving pressure for grain growth and hence the rate of grain coarsening. In a first part, the program will be focused on establishing the miscibility range and (equilibrium) microdomain formation in BCP/homopolymer blends systems in which the homopolymer forms a LCST blend with the host copolymer domain. In a second part, the project will focus on establishing the effect of filler/matrix interactions on the energy of grain boundary interfaces in quiescent organized films. If successful, this project will provide a basis for the development of novel processing strategies towards low defect-density BCP materials that harness the 'catalytic' effect of designed filler additives on grain coarsening to efficiently organize BCPs into desired large-grained microstructures. The program will enhance the teaching of a new class on "Soft Material Microstructure and Properties" and provide training for one graduate and several undergraduate researchers in the critical area of polymer and nanoscale materials. Finally, the benefits of kinesthetic experiments to the teaching of polymer and material science will be evaluated.

非技术摘要共聚物是能够自组织成能够自组织的功能性纳米结构的材料，这些纳米结构在从含水净化到下一代锂离子电池到高性能聚合物光伏的应用中具有技术相关性。这些技术的实现受到在自组织过程中形成的块共聚物纳米结构中的缺陷和降低材料特性的缺陷。该项目的目的是建立一个变革性的新过程，以控制和减少块共聚物纳米结构中的缺陷数量。这将促进具有改进性能的材料的可扩展和经济制造过程的开发。该计划将支持有关聚合物材料的新实验室课程的教学，并为一名研究生和几位本科生研究人员提供培训。将利用与少数民族服务机构的教育工作者进行的持续合作，以支持少数民族学生的参与。最后，将建立基于“触觉人类计算机互动”的新型教育技术的潜力，以此作为吸引和吸引中学生进行科学和工程学研究的一种手段。技术总结具有减少缺陷密度的大粒度微结构的制造是在广泛的各种创新材料技术中应用块共聚物（BCP）材料的先决条件。因此，了解谷物生长的机制和退火过程中缺陷结构的演变是与基于BCP的材料的科学和工程基本相关的主题。该项目的目的是阐明填充物矩阵相互作用在混乱的BCP/均聚合物混合物中的谷物变质上的作用，并测试谷物边界肤色过渡的假设 - 即在填充阶段的过渡，这些过渡阶段是在晶粒边界界面划分为谷物边界界面的粒子驱动压力 - 增加了谷物生长的压力。在第一部分中，该程序将集中于在BCP/均聚物混合系统中建立不知能力范围和（平衡）微域形成系统，其中均聚物与宿主共聚物结构域形成LCST混合物。在第二部分中，该项目将集中于建立填充/基质相互作用对静态有组织膜中晶界界面能量的影响。如果成功的话，该项目将为低缺陷密度的BCP材料开发新的加工策略，从而利用设计的填充剂添加剂对谷物的“催化”效应，以有效地将BCP组织到所需的大粒度显微结构中。该计划将增强有关“软材料微观结构和特性”的新课程的教学，并为聚合物和纳米级材料关键领域的一名研究生和几位本科研究人员提供培训。最后，将评估动力学实验对聚合物和材料科学教学的好处。

项目成果

期刊论文数量（10）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Solution processable liquid metal nanodroplets by surface-initiated atom transfer radical polymerization

DOI：
10.1038/s41565-019-0454-6
发表时间：
2019-05
期刊：
Nature Nanotechnology
影响因子：
38.3
作者：
Jiajun Yan;M. Malakooti;Zhao Lu;Zongyu Wang;Navid Kazem;C. Pan;M. Bockstaller;C. Majidi;K. Matyj
通讯作者：
Jiajun Yan;M. Malakooti;Zhao Lu;Zongyu Wang;Navid Kazem;C. Pan;M. Bockstaller;C. Majidi;K. Matyj

Tunable Assembly of Block Copolymer Tethered Particle Brushes by Surface-Initiated Atom Transfer Radical Polymerization

通过表面引发原子转移自由基聚合嵌段共聚物系留粒子刷的可调组装

DOI：
10.1021/acsmacrolett.0c00158
发表时间：
2020
期刊：
ACS Macro Letters
影响因子：
7.015
作者：
Wang, Zongyu;Lee, Jaejun;Wang, Zhenhua;Zhao, Yuqi;Yan, Jiajun;Lin, Yu;Li, Sipei;Liu, Tong;Olszewski, Mateusz;Pietrasik, Joanna
通讯作者：
Pietrasik, Joanna

Work in Progress: Kinesthetic Learning of Network Mechanics using Force Feedback Technology

正在进行的工作：使用力反馈技术进行网络力学的动觉学习