基于氢键调控的高强韧聚氨酯复合材料及其可循环使用性（英文）
作者单位：西南交通大学化学学院材料先进技术教育部重点实验室
会议名称：《2024第五届全国功能高分子材料学术研讨会》
会议日期：2024年
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
摘 要：With the expansion of elastomer material applications,the quantities of elastomer materials are increasing year by year,and the resulting elastomer waste is also gradually ***,most commercial elastomers,especially those with high toughness,are cross-linked with irreversible covalent bonds and are difficult to recycle through room-temperature self-healing,hot-press recovery,or solvent ***,the waste elastomers can only be scrapped or incinerated,which results in serious environmental pollution and waste of *** solve this problem once and for all,Utilizing the principle that solid-liquid phase transition can significantly change the reaction kinetics and thermodynamics of material preparation,we designed an ice-constrained interfacial cross-linking strategy to prepare TA/PU elastomer composites with high hydrogen-bonded cross-linking densities via ice/water phase transition induced by ice *** elastomer composites prepared by this method can achieve self-healing at temperature(room-temperature) below the glass transition temperature(38.3 °C),and the self-healing efficiency of toughness,strength,and elongation at break are 74%,84%,and 88%,***,the elastomeric composites exhibit wonderful comprehensive properties,such as incredible tensile strength of 26.3 MPa,elongation at break of 2583%,toughness of 284 MJ m-3,strong physical damage and chemical corrosion tolerance,wide temperature and broad frequency damping properties,shape memory function,hot-press recyclability and solvent *** study provides some reference for the preparation of recyclable composites with high hydrogen bonding density from polyhydroxy small molecules,as well as opens a new era for new materials with high performance and sustainable development concepts.