注压成型仿生纳米结构聚丙烯表面的冷凝微水滴动态行为  

Condensate Microdrop Dynamic Behavior on Injection-compression Molded Bionic Polypropylene Nanosurfaces

作　　者：安越 黄汉雄[1] AN Yue;HUANG Hanxiong(Lab for Micro/Nano Molding&Polymer Rheology,Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学,广东省高分子先进制造技术及装备重点实验室,微/纳成型与流变学研究室,广州510640

出　　处：《高等学校化学学报》2020年第8期1888-1895,共8页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:51533003);广东省自然科学基金(批准号:2016A030308018)资助。

摘　　要：选择2种锥形纳米孔结构参数不同的阳极氧化铝(AAO)作为模板,利用注射压缩成型(ICM)技术将AAO模板中的纳米孔结构复制到聚丙烯(PP)表面上,在复制的PP表面上形成了致密且规则排列的锥形纳米柱阵列结构.该结构是一种仿生蝉翼纳米结构.在纳米柱结构的润湿状态能量比和顶部直径与中心间距之比(分别约为0.46和0.26)均明显较小的PP复制物表面,冷凝微水滴呈明亮的球状;在没有外力作用下,冷凝微水滴可通过频繁地合并、跳跃从该表面上移除,表面不断更新,即该表面具有明显的冷凝微水滴自移除(CMDSR)功能,使表面上覆盖的冷凝微水滴维持明显较低的量,而且冷凝微水滴维持较小的直径(不超过40μm).该CMDSR功能是在未经低表面能修饰的情况下获得的.研究结果表明,利用ICM技术可快速、批量制备具有CMDSR功能的超疏水高分子材料.Achieving condensate microdrop self-removal(CMDSR)function on polymer surfaces is very significant.However,this is difficult because of very low thermal conductivity of polymer,and so the reports on polymer surfaces with CMDSR function are very sparse.Based on preliminary analyses,two kinds of anodic aluminum oxide(AAO)templates with different geometric parameters of tapered nanopores were chosen as the mold templates in injection-compression molding(ICM)in this work.It was demonstrated that the tapered nanostructure on the AAO templates was more accurately replicated onto the polypropylene(PP)surfaces via the ICM.The closely and more orderly aligned tapered nanopillars,which are similar to those on cicada wing,were formed on the PP replica surfaces.For the PP replica surface with the nanopillars exhibiting obviously smaller values of both wetting-state energy ratio(0.46)and tip diameter/center interspace ratio(0.26),the condensate microdrops remained bright and spherical on the surface.Interestingly,when adjacent microdrops grew large enough to coalesce,frequent out-of-plane jumping occurred and the merged microdrops could depart from the replica surface without any external forces,thus constantly renewing the surface.That is,the PP replica surface exhibited an obvious CMDSR function,which maintained significantly lower coverage of the condensate microdrops and smaller values of their sizes(<40 μm)on the surface.It should be noted that this function was created on the replica surfaces without any low surface energy chemistry modification.The results demonstrate that it is feasible to rapidly and massively fabricate superhydrophobic polymer surfaces with CMDSR function.

关 键 词：仿生纳米结构表面 冷凝微水滴动态行为 自移除 超疏水 注射压缩成型 聚丙烯 

分 类 号：O631[理学—高分子化学]