This project belongs to the field of materials and chemical industry. Fine processing of low surface energy materials and surface structures is the key to realizing the extremely wetted surface construction and the transition of functional surfaces to extreme wetted states. Currently, there are many problems in the surface construction of such materials, such as 1) The contradiction between the surface resistance of low surface energy materials and its high adhesion needs to the substrate limits its widespread application; traditional surface structure preparation technology is difficult to achieve precise control and large-scale processing of surface micro and nano structures; Problems such as poor stability such as functional surfaces or coatings with micro-nano structures. Therefore, this project proposes a multi-scale structure construction method for extremely wetted surfaces based on polybenzoxazine materials, reveals the influence mechanism of surface structure on surface properties and wetting state, and expands its research and application fields in superhydrophobic self-cleaning, controllable wetting, oil-water separation, corrosion prevention and other research and application fields, and has achieved original results in surface science, bionics and multi-field disciplines. (1)The contradiction between the surface anti-adhesion of low surface energy materials and the need for high adhesion to the substrate was solved. A new nano-imprint anti-adhesion material was designed, a new theory of surface energy regulation in which group effects and hydrogen bonds were synergized was proposed, and the traditional hydrogen bonds theory was corrected. A series of new polybenzoxazine materials with extremely low surface energy (about 15 mJ/m2, which is significantly lower than the 22 mJ/m2 of commercial Teflon) were successfully prepared. (2)A method for constructing the fine structure of polybenzoxazine functional surfaces was discovered, and a mechanism for regulating the extreme wetting state of the surface and the state transition (hydrophilic and hydrophobic, high and low adhesion) was first proposed. Ultra-wetting functional surfaces such as ultra-hydrophobic self-cleaning, high flux and high separation efficiency were creatively prepared. (3)It has opened up a new field of research on hydrophobic and anti-corrosion functional surfaces of polybenzoxazine, and proposed universal strategies for screening nanomaterials and regulating surface structure. Based on this theoretical prediction, a new nanocomposite anticorrosive coating with controllable filler dispersion and two-phase interaction was created, and the influence of its structure on macro superhydrophobic, anticorrosive and self-healing properties was clarified. The research results of this project are reported in Nanoscale, J. Hazard. Mater.、Corros. Published in well-known academic journals at home and abroad such as Sci., 8 representative papers were cited 337 times, of which he cited 317 times in SCI, and 46 related SCI papers were published. During the implementation of the project, the first person to complete the project was successively awarded the titles of Outstanding Academic Leader in Shanghai City and Leading Talent in Shanghai City. Apply for 9 related patents, including 6 authorizations. This project's work on the controllable transformation of extreme wetting states on the surface has received funding from major projects of the Scientific Research and Innovation Plan of the Shanghai City Education Commission (funding intensity is 3 million yuan). The extremely wetted surface construction method and structural control mechanism proposed in this project have been applied by domestic and foreign teams in the United States, Germany, Belgium and other countries and published in the international authoritative journal Adv. Mater., J. Mater. Chem. A.、Macromolecules.、Polym. Chem. and other outstanding evaluations and citations. The research results of this project have played an important role in promoting the development of theory and application research on the construction of extremely wetted surfaces.