GOALI: Connecting the Dots: Using Radical-formation Control to Achieve Desired EB-initiated Polymer Properties

目标：连接点：使用自由基形成控制来实现所需的 EB 引发聚合物性能

• 批准号: 2054775
• 负责人: Julie Jessop
• 金额: $ 31.99万
• 依托单位: Mississippi State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-01-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2054775&HistoricalAwards=false
• 关键词: GOALI; Connecting; Dots; Using; Radical

A joint academic-industrial partnership between the University of Iowa and ebeam Technologies (eT) is proposed to study fundamental science of electron beam curing of polymers. The work could eliminate the need for free-radical initiators in polymerization, help understand the mechanism of the initiation step by ebeam, and could lead to more uniform curing profiles. Electron-beam (EB) curing offers a faster, lower-power, and solvent-free means of polymerizing inks, films, coatings, and adhesives when compared to thermal drying and curing processes. The goal of this research project is to advance EB-curing technologies by developing structure-processing property relationships that incorporate the fundamental knowledge of how chemical structure influences radical formation and reactivity. This understanding will also enable the extension of EB-curing technologies to a wider range of applications, including high-performance materials for the automotive and aerospace industries and low-migration materials for the food and medical product industries.The following research topics will be pursued: (1) correlation of the radiation yield with monomer structure, (2) comparison of property development in EB- and UV-cured systems having equal radical concentration, (3) control of crosslink density through monomer structure and composition, and (4) minimization of migration through monomer structure and composition. Kinetic rates and radical concentrations will be measured using spectroscopic techniques to obtain monomer initiation efficiencies. Molecular weight distributions (for linear polymers), crosslink density (for polymer networks), and mechanical properties will be measured using gel permeation chromatography and dynamic mechanical analysis to demonstrate the impact of initiation mechanism, monomer structures, and process parameters on polymer physical properties. Gas chromatography/mass spectrometry will be used to identify and quantify leachable materials and their diffusion coefficients for ultra-low-migration systems. Development of advanced relationships between EB kinetics and the resulting polymer properties may provide a level of understanding of EB-cured systems significantly beyond what is now available. In addition to training graduate students in an industrially-relevant area of study, outreach activities to K-12 and undergraduate students in STEM are planned based on polymer demonstrations incorporating project results. Special emphasis will be placed on recruiting underrepresented female and minority students to participate in this research project.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

爱荷华州大学和电子束技术（eT）之间的联合学术-工业伙伴关系，提出了研究聚合物的电子束固化的基础科学。这项工作可以消除聚合中对自由基引发剂的需要，有助于理解电子束引发步骤的机理，并可能导致更均匀的固化曲线。与热干燥和固化工艺相比，电子束（EB）固化提供了一种更快、更低功率和无溶剂的聚合油墨、薄膜、涂料和粘合剂的方法。 该研究项目的目标是通过开发结构-加工性能关系来推进电子束固化技术，该关系包含化学结构如何影响自由基形成和反应性的基本知识。 这一认识也将使电子束固化技术扩展到更广泛的应用领域，包括汽车和航空航天工业的高性能材料以及食品和医疗产品工业的低迁移材料。（1）辐射产率与单体结构的相关性，（2）在具有相等自由基浓度的EB-和UV-固化体系中性能发展的比较，（3）通过单体结构和组成控制交联密度，和（4）通过单体结构和组成使迁移最小化。将使用光谱技术测量动力学速率和自由基浓度，以获得单体引发效率。将使用凝胶渗透色谱法和动态力学分析测量分子量分布（对于线性聚合物）、交联密度（对于聚合物网络）和力学性能，以证明引发机制、单体结构和工艺参数对聚合物物理性能的影响。将使用气相色谱/质谱法识别和定量超低迁移系统的可沥滤材料及其扩散系数。EB动力学和所得聚合物性能之间的高级关系的发展可以提供一个EB固化系统的理解水平显着超出现在可用的。除了在工业相关的研究领域培训研究生外，还计划根据结合项目结果的聚合物演示，为K-12和STEM本科生开展外联活动。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。