基于石墨烯修饰寡聚黄烷-3-醇构建的酚醛树脂快固与增韧机制

酚醛树脂胶接人造板的耐水胶接性与耐候性优异，可用作结构及室外建材，符合人造板高质量发展需求。项目针对酚醛树脂固化温度高、固化速度慢、固化胶层脆性大等问题，拟以石墨和马占相思单宁为原料，通过固体酸辅助的干法球磨构筑石墨烯修饰寡聚黄烷-3-醇，通过调节球磨机械能和撕裂石墨烯的亲核性调控石墨烯修饰寡聚黄烷-3-醇的结构与性能，将其用于快固与增韧酚醛树脂构建。研究石墨烯修饰寡聚黄烷-3-醇的分子结构、尺寸形貌、界面特性等对酚醛树脂固化速度、固化温度、适用期及胶层韧性等的影响，探讨石墨烯修饰寡聚黄烷-3-醇和酚醛树脂相互作用关系；解析石墨烯修饰寡聚黄烷-3-醇对酚醛树脂相态结构、固化行为、胶接界面结构与性能及耐水胶接性影响规律，最终解明石墨烯修饰寡聚黄烷-3-醇对酚醛树脂的快固与增韧机制，为高性能酚醛树脂研究开发，解决酚醛树脂固化速度慢、固化胶层脆性大等问题及促进人造板高质量发展提供理论与技术支持。

Wood-based panels bonded with phenol-formaldehyde (PF) resin possess great water-resistant adhesion and weather resistance properties, which can be used as structural and outdoor building materials, meeting the demand for high-quality development of wood-based panels. This project aims to solve the problems of high curing temperature, low curing rate, and high brittleness of cured adhesive layer of PF resin. It is proposed to use graphite and Acacia mangium tannin as raw materials to construct graphene-modified oligomeric flavan-3-ol via a solid acid-assisted dry ball milling strategy. Structures and properties of the graphene-modified oligomeric flavan-3-ol will be regulated by adjusting the mechanical energy of ball milling and the nucleophilicity of unzipped graphene. Graphene-modified oligomeric flavan-3-ol will be used in the construction of fast curing and toughening PF resin. The effects of molecular structures, dimensions and morphology, and interfacial characteristics of graphene-modified oligomeric flavan-3-ol on the curing rate, curing temperature, pot life, and toughness of adhesive layer of PF resin will be studied. The interaction between graphene-modified oligomeric flavan-3-ol and PF resin will be investigated. The effects of graphene-modified oligomeric flavan-3-ol on the phase morphology, curing behaviors, structures and properties of bonding interface, and water-resistant adhesion property of PF resin will be analyzed. Finally, the fast curing and toughening mechanism of graphene-modified oligomeric flavan-3-ol on PF resin will be clarified, which will provide theoretical and technical support for researching and developing high-performance PF resin, solving the problems of low curing rate and high adhesive layer brittleness of PF resin, and promoting high-quality development of wood-based panels.