外磁场下PDMS基复合材料表面微结构成型及防冰性能

Fabrication and Anti⁃icing Properties of Polydimethylsiloxane⁃matrix Composite with Microstructured Surfaces under Magnetic Field

通过化学交联反应制备了聚磷腈包裹四氧化三铁纳米粒子(Fe_(3)O_(4)@PZS),将其负载于碳纳米管(CNTs)上,并与聚二甲基硅氧烷(PDMS)溶于氯仿溶液中,形成一种具有类“神经网络结构”的磁性高分子复合材料(PDMS/CNTs/Fe_(3)O_(4)@PZS)。以具有微尺度的经纬丝编织而成的金属筛网作为微型腔模板,在外磁场下,采用热压印法成型PDMS/CNTs/Fe_(3)O_(4)@PZS复合材料表面阵列微结构。研究表明,在外磁场作用下,PDMS填充微型腔的程度得到大幅提升。PDMS/CNTs/Fe_(3)O_(4)@PZS复合材料的微结构表面呈现大于150°的接触角和小于12 kPa的冰黏附强度,并且,在远红外光照射10 s后,该复合材料表面温度升温至200℃,这表明,该复合材料具有优异的防冰特性和光热除冰性能。

Polyphosphazenes capped Fe_(3)O_(4)nanoparticles(Fe_(3)O_(4)@PZS)were prepared by chemical crosslinking method,which were loaded on surfaces of carbon nanotubes(CNTs).Then,the polydimethylsiloxane(PDMS)mixed with CNTs/Fe_(3)O_(4)@PZS were dissolved in chloroformic solution.Finally,a kind of magnetic polymer composite,named PDMS/CNTs/Fe_(3)O_(4)@PZS,with an analogous“neural network structure”formed.The woven wire mesh was used as a template of the micro cavity,and the microstructure on PDMS/CNTs/Fe_(3)O_(4)@PZS surfaces was molded by hot embossing under the external magnetic field.The results showed that a better matching between replica and woven mesh was confirmed by magnetic forces.For PDMS/CNTs/Fe_(3)O_(4)@PZS microstructured surfaces,the contact angle of was greater than 150°,and the ice adhesion strength was less than 12 kPa.After 10 s of far-infrared light irradiation,the surface temperature of the composite rose to 200℃,indicating that the composite had excellent anti-icing properties and photothermal deicing performance.