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.

非技术概要嵌段共聚物是能够自组织成功能性纳米结构的材料，其在从水净化膜到下一代锂离子电池再到高性能聚合物光伏等应用中具有技术相关性。这些技术的实现受到自组织过程中形成的嵌段共聚物纳米结构缺陷的阻碍，这些缺陷降低了材料的性能。该项目的目标是建立一种变革性的新工艺来控制和减少嵌段共聚物纳米结构中的缺陷数量。这将促进可扩展且经济的制造工艺的开发，以提高性能的材料。该项目将支持高分子材料新实验室课程的教学，并为一名研究生和几名本科生研究人员提供培训。将利用与少数族裔服务机构教育工作者的持续合作来支持少数族裔学生的参与。最后，基于“触觉人机交互”的新型教育技术作为吸引中学生和高中生学习科学和工程的手段的潜力将得到证实。技术摘要制造具有降低缺陷密度的大晶粒微结构是嵌段共聚物（BCP）材料在各种创新材料技术中应用的先决条件。因此，了解退火过程中晶粒生长的机制和缺陷结构的演变是与 BCP 材料的科学和工程具有根本相关性的课题。该项目的目的是阐明填料-基体相互作用对可混溶的 BCP/均聚物共混物中晶粒粗化的作用，并测试晶界相变的假设 - 即隔离到晶界界面的填料相内的转变——增加晶粒长大的驱动压力，从而提高晶粒粗化的速度。在第一部分中，该计划将重点关注 BCP/均聚物共混体系中的混溶性范围和（平衡）微域形成，其中均聚物与主体共聚物域形成 LCST 共混物。在第二部分中，该项目将重点研究填料/基体相互作用对静态组织薄膜中晶界界面能量的影响。如果成功，该项目将为开发低缺陷密度 BCP 材料的新型加工策略奠定基础，该策略利用设计的填料添加剂对晶粒粗化的“催化”作用，有效地将 BCP 组织成所需的大晶粒微观结构。该项目将加强“软材料微观结构与性能”新课程的教学，并为一名研究生和几名本科生研究人员提供聚合物和纳米材料关键领域的培训。最后，将评估动觉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