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用微注射压缩成型(μ-ICM)方法,分别借助双级和三级复合微结构模板,以单步模板法制备表面呈微结构的大尺寸聚丙烯(PP)样品.研究发现,采用双级结构模板,在较低模具压缩力下制备的表面呈单级结构(封闭式微棱),可一定程度地提高表面疏水性,使静态接触角(CA)从PP的本征值(85.0°)增大至134.2°;较高的模具压缩力可保证微棱及其上层的微锥体得以完整复制,形成双级复合结构,使表面呈现荷叶效应(CA大于150°,滚动角(RA)小于5°).在均匀分布、直径250μm的微柱上表面构建上述的双级结构,形成三级复合结构,可赋予样品表面更高的CA(达到164.5°),此外,水滴在微柱上表面的边缘周围形成局部的非复合润湿状态,使表面的RA超过90°,表现出花瓣效应.
Micro-injection compression molding (μ-ICM) method was used to prepare large-scale polypropylene (PP) samples with microstructures on the surface by single-step template method with two-stage and three-stage composite microstructure templates respectively. The results showed that the surface morphology of the template was a single-stage structure (closed micro-edge) prepared under lower mold compressive force, which could increase the hydrophobicity of the surface to a certain extent and increase the static contact angle (CA) from the eigenvalue (85.0 °) of PP Up to 134.2 °. The higher mold compressive force can ensure micro-pyramidal micro-pyramids and their upper layer to be completely copied, forming a two-stage composite structure, so that the surface presents the lotus leaf effect (CA greater than 150 °, roll angle (RA) 5 °) .The above-mentioned two-stage structure was constructed on the upper surface of microcolumn with a diameter of 250μm and uniformly distributed to form a three-level composite structure, which could give a higher CA (up to 164.5 °) on the sample surface. In addition, The edge of the edge of the formation of a partial non-composite wetting state, so that the surface of RA over 90 °, showing the petal effect.