Healing and Reprocessing of Epoxy with Dynamic Covalent Bonds and Composites

动态共价键环氧树脂和复合材料的修复和再加工

• 批准号: 1404627
• 负责人: Hang Qi
• 金额: $ 36.28万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2017-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1404627&HistoricalAwards=false
• 关键词: Healing; Reprocessing; Epoxy; Dynamic; Covalent

This grant provides funding for the study of the relationship between processing conditions and the healing and reprocessing of polymers and polymer composites containing dynamic covalent bonds. A significant feature of these polymers is that the backbone of the macromolecular chain can break and reconnect through bond exchange reactions. While such dynamic covalent reactions do not change the overall topology and properties of the polymer network, macroscopically they result in stress relaxation and material welding. The proposed work will examine the bond exchange reaction kinetics and welding kinetics and their dependence on processing conditions. Epoxy samples containing dynamic covalent bonds will be prepared in the lab and tested under different thermo-mechanical loading conditions to understand the effects of temperature on the bond exchange reaction kinetics. These samples will be broken then joined together under different thermo-mechanical loading conditions. Special dyes will be incorporated into polymer samples to facilitate monitoring the bond breaking and reforming process, as well as the migration of species due to bond exchange reactions. From these experiments, the relationships between bond exchange reaction kinetics, welding kinetics, and processing conditions will be established. The re-processibility of the dynamic covalent bond epoxy and its composites will also be investigated.If successful, the results from this work will lead to the development of new ?green? epoxy and composites that can be reshaped and recycled. The primary goal of this research is to establish fundamental principles for bond exchange reaction kinetics and welding kinetics. These principles may include how processing parameters, such as temperature, hold time, applied pressure, and surface roughness, can affect reshaping, welding, and re-processibility of the epoxy. Determining these processing parameters will enable robust processing and recycling of the epoxy, reduction in processing cost, and improvement on product quality. The established principles can also be used for polymers containing other types of dynamic covalent bonds.

该赠款为研究处理条件与含有动态价值键的聚合物和聚合物复合材料的愈合和后处理之间的关系提供了资金。这些聚合物的一个重要特征是大分子链的骨干可以通过键交换反应破裂和重新连接。尽管这种动态共价反应并没有改变聚合物网络的整体拓扑和特性，但宏观上会导致压力放松和材料焊接。拟议的工作将检查债券交换反应动力学和焊接动力学及其对加工条件的依赖。将在实验室中制备包含动态共价键的环氧样品，并在不同的热机械加载条件下进行测试，以了解温度对键交换反应动力学的影响。这些样品将被打破，然后在不同的热机械加载条件下连接在一起。特殊的染料将纳入聚合物样品中，以促进监测键断裂和改革过程，以及由于键交换反应而引起的物种的迁移。从这些实验中，将建立键交换反应动力学，焊接动力学和加工条件之间的关系。动态共价环氧树脂及其复合材料的重新处理也将得到研究。如果成功，这项工作的结果将导致新的？绿色的发展？可以重塑和回收的环氧树脂和复合材料。这项研究的主要目标是建立债券交换反应动力学和焊接动力学的基本原理。这些原则可能包括处理参数（例如温度，保持时间，施加的压力和表面粗糙度）如何影响环氧树脂的重塑，焊接和重新处理。确定这些处理参数将使环氧树脂的强大加工和回收利用，加工成本的降低以及产品质量的提高。已建立的原理也可以用于包含其他类型的动态共价键的聚合物。