Study On The Preparation And Properties Of High Efficiency Anti/De-Icing Materials Based On Polyphosphazene

Ice accretion on aircraft has an adverse impact on both safety and performance.As such,there have been great efforts devoted to the development of strategies for de-icing and anti-icing.Thus,it is of great significance to develop and design new anti/de-icing materials.It is found that the bionic surface has excellent performance in the field of anti/de-icing,representative surfaces include super-hydrophobic anti-icing surfaces and slippery liquid-infused porous surfaces.However,it is currently difficult to have an anti-icing surface capable of achieving both low ice adhesion strength and long ice protection life.Based on the two principles of high efficiency and long-term effect,in this paper,based on the excellent chemical structure designability of polyphosphazene（POPs）materials,the PHC/PDMS superhydrophobic anti-icing coating and phase conversion slippery liquid-infused porous surface（PCSLIPS）were constructed.In this paper,a kind of superhydrophobic coating with micro/nano composite structure of PHC and PDMS polymer crosslinking was designed and prepared by using fluorohydroxy compound as the second comonomer and phosphonitrile as the crosslinking polycondensation reaction.And PHC/PDMS superhydrophobic coating is used in the field of anti-icing.The surface of the prepared material was analyzed by SEM,FT-IR and the like.The fluorine-containing group（-CF₃）in the coating migrated to the surface of the coating,and accumulated on the surface of the coating to make the surface have low surface energy characteristics.The fluorine-containing group（-CF₃）in the coating migrated to the surface of the coating,and agglomerated on the surface of the coating which have low surface energy characteristics.With the increase of PHC content,the surface roughness increases gradually,and the composite with PDMS forms a micro/nano composite structure.The surface micro/nano scale roughness and the chemical composition of the fluorine-containing group（-CF₃）work together to form a superhydrophobic coating.The surface of PHC/PDMS coating exhibits high hydrophobicity（CA=164°,SA=3.7°）,which is facilitates the roll-off of droplets on the surface.The coating has an icing delay time of 1472 s,which can cope with nearly 100 ice deicing cycles.The coating shows good self-cleaning and anti-icing performance in wet and cold environment（-15℃,relative humidity=70%）.At the same time,due to the covalent cross-linking effect of PDMS and PHC,the surface exhibits excellent mechanical durability against various damages.Furthermore,the phase conversion slippery liquid-infused porous surface（PCSLIPS）was synthesized on the basis of PHC/PDMS superhydrophobic coating to achieve the purpose of super lubrication and de-icing.It is confirmed by SEM characterization that the composite coating has a micro-nano-scale structure.Due to the low-temperature phase transition of the phase conversion slippery liquid（hexadecane）,PCSLIPS has excellent long-term properties,and the surface has self-repairing properties when subjected to interface mechanical damage.Because PHC/PDMS has good affinity with alkanes,the phase-conversion lubricating layer of small molecules can be locked on the coating surface by intermolecular force and hydrogen bond.Tetradecane has a suitable freezing point,which can effectively reduce the crystallization temperature of the droplets on the surface,capture the latent heat released during the condensation process,and effectively reduce the ice adhesion on the surface（15k Pa）.The PCSLIPS has excellent anti/de-icing performance.