报告人：南方科技大学 洪伟教授
报告时间：2023年3月21日（周二）上午 9:00
报告地点：屏峰校区机械楼D530
报告摘要：
Composed mostly of solvent molecules and a loosely crosslinked polymer network, a polymeric gel appears and feels like a liquid. Questions naturally arise: Are the mechanical properties fully determined by its chemical composition, just like a liquid solution, or would the synthesis condition or process affect its network structure and further the macroscopic properties? Through carefully planned experiments, we systematically studied the mechanical properties of a set of polymeric gels with identical chemical compositions but prepared through different processes. Strong dependences of the mechanical properties on the synthesis conditions were identified, and the results were found to follow a set of scaling laws. From basic theories and fundamental yet intuitive hypotheses characterizing the network topology and structural evolution, we derive the scaling laws which successfully capture the experimental observations. We further studied the fracture of these chemically identical gels and found some intriguing relations between fracture energy and synthesis processes. These findings provide insights to the mechanisms in the formation of network structures and topologies at synthesis, and their profound effects on macroscopic properties. The theory established may influence the design and synthesis of polymeric materials with extraordinary performances.
个人简历：
洪伟博士现任南方科技大学力学与航空航天工程系教授、副系主任，深圳市软体力学与智造重点实验室副主任，美国机械工程师学会会士(ASME Fellow)。洪伟本科与硕士毕业于清华大学，博士毕业于哈佛大学。2008年起任教于美国爱荷华州立大学航空航天工程系，历任助理教授、副教授、教授。2015年起双聘于日本北海道大学国际软物质中心，历任副教授、教授。2018年全职加入南方科技大学。洪伟的研究涉及固体力学、断裂力学、微结构演化、多物理场建模等领域，他的近期研究兴趣主要集中在高分子物理、软物质力学、界面粘接、介电击穿、柔性电子、表面失稳等方面。
