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CAREER: Understanding the Process-Structure-Property Relationships in Polymer Nanocomposites Reinforced with Gas-Phase-Synthesized Graphene

职业：了解气相合成石墨烯增强聚合物纳米复合材料的工艺-结构-性能关系

基本信息

批准号：
1943599
负责人：
Albert Dato
金额：
$ 50万
依托单位：
Harvey Mudd College
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-05-15 至 2025-04-30
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1943599&HistoricalAwards=false
关键词：
CAREER Understanding Process Structure Property

项目摘要

This Faculty Early Career Development (CAREER) grant supports fundamental research on the scalable manufacturing of graphene-reinforced nanocomposites. This class of nanocomposites are lightweight and high strength and they can enable a diverse range of new applications, such as safer vehicles with increased fuel efficiency, impact-resistant electronics with improved heat dissipation, and lightweight wind turbine blades capable of generating larger amounts of renewable energy. However, current manufacturing processes for graphene-based nanocomposites use graphene obtained through the exfoliation of graphite. Nanocomposites reinforced with exfoliated graphene exhibit three fundamental challenges that limit enhancements in properties: defects, dispersion and aggregation. Furthermore, producing exfoliated graphene requires hazardous acids and purified water and generates toxic byproducts. Incorporating gas-phase synthesized graphene into polymers can overcome these challenges. This project aims to discover the relationships between the processing, structure and properties of polymer-matrix nanocomposites reinforced with gas-phase synthesized graphene. The research promotes the progress of science by revealing new strengthening and thermal transport mechanisms, processing conditions, and graphene-polymer interactions that advance the fundamental understanding of composite materials. This multidisciplinary project integrates the fields of manufacturing, materials science, and chemistry, and broadens the participation of underrepresented groups through the inclusion of low income, potential first-generation college students in the federally-funded Upward Bound Program at Harvey Mudd College. The grant creates and freely disseminates a new nanocomposites course that employs novel techniques that enhance student learning, which improves education in STEM fields.The current understanding of graphene-based nanocomposites is largely based on polymers containing exfoliated graphene because the chemical vapor deposition of graphene on substrates is impractical for manufacturing nanocomposites. The specific goal of this project is to transform understanding of graphene-based nanocomposites by discovering the processing-structure-property relationships in polymers reinforced with gas-phase synthesized graphene (GSG). GSGs are produced through the decomposition of ethanol in atmospheric argon plasmas. The goal of this research is achieved by (1) dispersing graphene in thermosetting resins and fabricating nanocomposites by curing the dispersions in molds, (2) mixing graphene with thermoplastics using scalable compounding processes and forming nanocomposites by injection molding, (3) determining the strength and stiffness of nanocomposites through tensile testing, (4) measuring the thermal conductivity of nanocomposites using the transient plane source method, and (5) correlating property enhancements with nanocomposite microstructures using electron microscopy techniques. This project generates new knowledge that advances the fields of composites, materials science, and chemistry, and enables the environmentally friendly high-throughput manufacturing of graphene-based nanocomposites. It establishes the PI’s long-term career in the advanced manufacturing of nanocomposites that provide solutions to challenges in transportation, renewable energy, and the environment.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.

这项学院早期职业发展(Career)补助金支持可扩展的石墨烯增强纳米复合材料制造的基础研究。这类纳米复合材料重量轻、强度高，可以实现一系列新的应用，例如具有更高燃油效率的更安全的车辆、具有更好散热的抗冲击电子产品，以及能够产生更多可再生能源的轻型风力涡轮机叶片。然而，目前基于石墨烯的纳米复合材料的制造工艺使用的是通过剥离石墨获得的石墨烯。剥离石墨烯增强的纳米复合材料表现出三个限制性能提高的基本挑战：缺陷、分散和聚集。此外，生产剥离的石墨烯需要危险的酸和纯净水，并会产生有毒的副产品。将气相合成的石墨烯引入聚合物中可以克服这些挑战。本项目旨在发现气相合成石墨烯增强聚合物基纳米复合材料的工艺、结构和性能之间的关系。这项研究通过揭示新的强化和热传输机制、加工条件以及石墨烯-聚合物相互作用促进了对复合材料的基本理解，从而促进了科学的进步。这个多学科项目整合了制造、材料科学和化学领域，并通过将低收入、潜在的第一代大学生纳入哈维穆德学院联邦资助的向上跳跃计划，扩大了代表不足的群体的参与。这笔赠款创建并免费传播了一门新的纳米复合材料课程，该课程采用了增强学生学习的新技术，从而改善了STEM领域的教育。目前对基于石墨烯的纳米复合材料的理解主要基于含有剥离的石墨烯的聚合物，因为在衬底上化学气相沉积石墨烯对于制造纳米复合材料是不切实际的。该项目的具体目标是通过发现气相合成石墨烯(GSG)增强聚合物中的加工-结构-性能关系来改变对石墨烯纳米复合材料的理解。GSG是通过乙醇在大气Ar等离子体中的分解而产生的。本研究的目标是：(1)将石墨烯分散在热固性树脂中，并通过在模具中固化分散体来制备纳米复合材料；(2)通过可扩展的复合工艺将石墨烯与热塑性塑料混合并通过注射成型形成纳米复合材料；(3)通过拉伸测试来确定纳米复合材料的强度和刚度；(4)使用瞬变平面源法测量纳米复合材料的导热系数；(5)利用电子显微镜技术将性能增强与纳米复合材料的微观结构相关联。该项目产生了新的知识，推动了复合材料、材料科学和化学领域的发展，并使环境友好型高通量石墨烯基纳米复合材料的制造成为可能。它确立了PI在先进的纳米复合材料制造领域的长期职业生涯，为交通、可再生能源和环境方面的挑战提供解决方案。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。