利用聚多巴胺/叶酸制备超疏水棉织物

Preparation of Super-Hydrophobic Cotton Fabric Using Polydopamine/Folic Acid

通过聚多巴胺(PDA)包裹叶酸(FA)自聚合形成微纳米结构,利用十六烷基三甲氧基硅烷(HDTMS)修饰粗糙表面,达到降低织物表面张力的目的,从而赋予棉织物超疏水性能,此时棉织物表面的接触角达到151.9°,滚动角达到8°。FA可以通过π-π相互作用和氢键共同诱导多巴胺(DA)的聚合。HDTMS与棉织物表面的羟基发生缩合反应以提高其疏水性。改性棉织物表面经过1000次摩擦后,接触角仍保持在130°以上,其物理力学性能仅略微下降。在满足棉织物基础应用的同时大幅度扩展了棉织物的应用范围。

Folic acid(FA)was encapsulated with polydopamine(PDA)to form micro-nano structure by self-polymerization,and hexadecyltrimethoxysilane(HDTMS)was used to modify the rough surface to reduce the surface tension of the fabric,thereby endowing cotton fabric with superhydrophobic performance.At this time,the contact angle on the surface of the cotton fabric reaches 151.9°,and the sliding angle reaches 8°.FA can induce the polymerization of DA throughπ-πinteraction and hydrogen bonding.HDTMS reacts with the hydroxyl groups on the surface of the cotton fabric to increase its hydrophobicity.After 1000 times of friction on the surface of the modified cotton fabric,the contact angle remains above 130°,and its physical and mechanical properties are only slightly reduced.While satisfying the basic applications of cotton fabrics,the application range of cotton fabrics can be greatly expanded.