超耐用疏冰涂层的制备及性能研究

Ultra-robust icephobic coatings with high toughness,strong substrate adhesion and self-healing capability

被动疏冰涂层作为一种新形防除冰方法,拥有环境友好、耗能低、经济等优势,因此在过去十几年来被广泛研究.但是,目前的主动疏冰涂层仍存在疏冰性与耐久性难以兼容的问题.本文设计了一种兼具高韧性、强基底粘附力和自愈合能力的透明疏冰涂层.涂层具有疏水性、光滑表面及低模量,保障了涂层的低冰粘附强度.通过引入类海绵结构,冰粘附强度可降低至26.7±1.1 kPa.涂层高分子网络的多重氢键赋予其高韧性、强基底粘附力和自愈合能力.因此,涂层在35次结冰/除冰循环和600次机械磨损之后能避免涂层剥离并保持疏冰性,且能愈合机械磨损恢复其疏冰性.另外,涂层在海水及近北极气候暴露8个月后仍能保持良好的疏冰性.该工作为耐久性疏冰涂层的设计提供了一种新思路.

Enabling surfaces with passive anti-icing properties is an emerging,facile,economical,and energy-saving strategy to mitigate the harm caused by ice accretion.However,the combination of icephobicity and robustness remains a daunting challenge.Herein,we present an ultra-robust transparent icephobic coating with high toughness,strong substrate adhesion,and self-healing capability.Hydrophobicity,smoothness,and softness of the coating guarantee low ice adhesion strength.By incorporating a spongy structure,the ice adhesion strength of the coating is lowered further down to 26.7±1.1 kPa.Importantly,the coating exhibits high toughness,strong adhesion to the substrate,and self-healing capability due to the presence of multiple hydrogen bonding.Consequently,the coating maintains its icephobicity after 35 icing/deicing cycles and 600 abrasion cycles,is resilient to delamination,and is able to heal and recover its icephobicity from the mechanical damage introduced by both cuts and abrasions.Moreover,the coating sustains its icephobicity after eight months of immersion in saltwater,as well as exposure to the near-arctic weather in Trondheim(Norway).This work presents new insights into the design of robust icephobic coatings that can sustain severe mechanical loading for use in real complex environments.