Green Synthesis of Mechanical Robust Superhydrophobic CNT@PU Coatings with High Flexibility for Exte

• 作 者: Zhengwei Wu Yizhou Shen Jie Tao Zhenfeng Jia Haifeng Chen Jiawei Jiang Zhen Wang
• 机 构: College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanji
• 出 处: 仿生工程学报（英文版）
• 发表日期: 2021年1期
• 关键词: bio-based PU superhydrophobic coatings high flexibility mechanical durability

Superhydrophobic coatings with high flexibility and mechanical durability can well address many practical application problems.To this end,we proposed and fabricated a kind of bio-based superhydrophobic (multi-walled carbon nanotubes) CNT@PU (polyurethane) coatings.It was demonstrated that the CNT@PU coatings with 64％sof t segment content possessed the preferable bonding strength (5B) with metal substrates.The multi-walled carbon nanotubes,as additive materials,were used to construct the microscopic structures of the coating surfaces,which made polyurethane surface superhydrophobic (water contact angle being 156.9°,and water sliding angle being 4.3°) .Furthermore,the high bonding strength between CNT and coating matrix led to robust mechanical durability of superhydrophobic CNT@PU coatings,and the coatings remained superhydrophobicity after 10 cycles of abrasion under 100 g load pressure.Also,the superhydrophobic coatings could well resist 5 cycles of tape-peeling action,and presented outstanding flexibility.The superhydrophobic CNT@PU coatings with high flexibility and mechanical durability could be applied to various substrates suggesting their big potential in future real-world application.