Facile preparation and strong adhesive strength of honeycomb polyurethane films with small pore diameter,Journal of Applied Polymer Science

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Facile preparation and strong adhesive strength of honeycomb polyurethane films with small pore diameter
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-07-14 , DOI: 10.1002/app.49657
Zhen Hong ₁ , Mingshan Xue ₁ , Yidan Luo ₁ , Zuozhu Yin ₁ , Chan Xie ₁ , Junfei Ou ₁ , Fajun Wang ₁

Affiliation

With the continuous development of bionics, such as, geckos and virginia creeper with both superhydrophobic and super‐adhesive, the surface wetting and super‐adhesive properties of various porous materials have attracted extensive attention of the scientific and medical communities. Here, the honeycomb polyurethane (PU) porous films with strong adhesion were successfully prepared by microphase separation method and the effects of growth parameters on their microstructure and adhesive strength to ice were investigated. It was found that a high relative humidity (e.g., 100%) and a low solution concentration (e.g., 2%) facilitated the formation of ordered honeycomb PU porous films, and as‐prepared PU pores with average pore diameter as small as 5 μm are better ordered and more uniform than these in related documents. Although the contact angle of water droplets on the surface of PU porous films increased from the premodification value of 85–130° to more than 160° after surface modification with polydopamine (PDA), the corresponding rolling angle remained approximately constant (180°), indicating that the surface of PU porous films has strong adhesion similar to geckos and virginia creeper. Furthermore, at lower temperature, the PU porous films exhibited the high adhesive strength of 142.13 kPa on ice, which was strongly dependent on the porous microstructures and surface compositions. The improved adhesive behavior to ice of honeycomb PU porous films modified with PDA provides new strategies for surface modification of materials and potential applications in medical domain.

中文翻译：

孔径小的蜂窝状聚氨酯薄膜的制备简便，附着力强

随着仿生学的不断发展，例如壁虎和弗吉尼亚爬山虎同时具有超疏水性和超强粘合性，各种多孔材料的表面润湿性和超强粘合性吸引了科学和医学界的广泛关注。在这里，通过微相分离法成功地制备了具有强粘附力的蜂窝状聚氨酯（PU）多孔膜，并研究了生长参数对其微观结构和对冰的粘附强度的影响。结果发现，较高的相对湿度（例如100％）和较低的溶液浓度（例如2％）有助于形成有序蜂窝状PU多孔膜，以及制备的平均孔径小至5μm的PU孔比相关文件中的命令更好，更统一。尽管在用聚多巴胺（PDA）进行表面改性后，PU多孔膜表面上水滴的接触角从85-130°的预改性值增加到160°以上，但相应的滚动角仍保持近似恒定（180°），表明PU多孔膜的表面具有与壁虎和爬山虎相似的强粘附力。此外，在较低温度下，PU多孔膜在冰上表现出142.13 kPa的高粘合强度，这在很大程度上取决于多孔微结构和表面组成。用PDA改性的蜂窝状PU多孔膜对冰的改善的粘合性能为材料的表面改性和在医学领域的潜在应用提供了新的策略。

更新日期：2020-07-14

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