科研之友
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摘要
An anodic stainless steel template was prepared by two-step anodic oxidation. Using injection-compression molding with the template, replicas with the nanopillars on their surfaces were molded for flexible polypropylene/poly(ethylene-co-octene)(PP/POE) blend with a mass ratio of 3:1 and quasi-rigid PP. The dynamic behavior of the droplets impacting the replicas with -10 degrees C was investigated. It was demonstrated that the dense nanopillars endowed the replica surfaces with superhydrophobicity and extremely low adhesion. In a lower impact velocity range, the contact times of the droplets impacting on the blend replica surface were shorter than those on the PP replicas. This is attributed to the conversion of the elastic potential energy within the flexible nanopillars stored in the spreading stage to the kinetic energy of the droplets in the retraction stage. In a higher impact velocity range, the contact time of the droplets on the blend replica surface was further shortened when the elastic potential energy stored within both replica substrate and nanopillars was converted into the kinetic energy of the droplets. The results suggest that the flexibility and surface superhydrophobicity of the PP/POE replica endow it with excellent anti-freezing adhesive properties. Compared with the PP counterpart surface, the freezing time of the droplet(50 mu L) was extended by 2.71 times and the ice adhesion strength was reduced by 58% on the PP/POE blend replica surface. The results demonstrate that it is feasible to rapidly and massively mold flexible superhydrophobic polymer surfaces with anti-freezing adhesive/anti-icing function.
