聚二甲基硅氧烷处理自修复疏水壳聚糖

表面疏水性通常由较低表面能的材料产生。然而，这是可以预见的。同时，利用亲水材料构建自修复表面疏水性是罕见的，这是一个新兴且重要的方面。在此，我们首次利用壳聚糖和单宁酸（标记为Cot@PTA@PTA-CS）在棉织物表面制备了不可预测的表面疏水性，其中壳聚糖起决定性作用。有趣的是，Cot@PTA@PTA-CS的表面疏水性可以在热处理下恢复。值得注意的是，使用亲水材料实现了具有自修复特性的不可预测的表面疏水性，与无氟疏水或氟化材料产生的传统可预测表面疏水性相比，这是一项先进的工作。然后，将Cot@PTA@PTA-CS用聚二甲基硅氧烷处理以获得表面超疏水性，视为Cot@PTA@PTA-CS@PDMS。Cot@PTA@PTA-CS@PDMS和Cot@PTA@PTA-CS在机械磨损后均表现出良好的疏水性。此外，Cot@PTA@PTA-CS@PDMS对95℃水、二碘甲烷、乙二醇和二甲亚砜表现出良好的排斥性。因此，计算了改性棉织物的表面自由能。此外，改性棉织物还具有优异的抗紫外线、抗氧化活性、光热效应和自洁性。最后，采用Cot@PTA@PTA-CS@PDMS进行高效油水分离。简要地，

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Surface hydrophobicity is generally created by lower surface energy materials. However, it is predictable. Simultaneously, it is rare to construct a self-healing surface hydrophobicity using hydrophilic materials, which is an emerging and significant aspect. Herein, we for the first time fabricated the unpredictable surface hydrophobicity on the cotton fabric surface by utilizing chitosan and tannic acid (labelled as Cot@PTA@PTA-CS), in which chitosan played the decisive role. Interestingly, the surface hydrophobicity of Cot@PTA@PTA-CS could be recovered under the heating treatment. Notable, using the hydrophilic materials realizes the unpredictable surface hydrophobicity with self-healing characteristics, which is an advanced work in contrast to the conventional predictable surface hydrophobicity created by fluorine-free hydrophobic or fluorinated materials. Then, Cot@PTA@PTA-CS was treated with polydimethylsiloxane to obtain surface superhydrophobicity, regarded as Cot@PTA@PTA-CS@PDMS. Cot@PTA@PTA-CS@PDMS and Cot@PTA@PTA-CS all exhibited good hydrophobicity after mechanical abrasion. Moreover, Cot@PTA@PTA-CS@PDMS exhibited good repellency to 95 °C water, diiodomethane, ethylene glycol, and dimethyl sulfoxide. So, the surface free energies of the modified cotton fabrics were calculated. Besides, the modified cotton fabrics also possessed excellent UV resistance, anti-oxidation activity, photothermal effect, and self-cleaning. Finally, Cot@PTA@PTA-CS@PDMS was used for the high-efficient oil/water separation. Briefly, this work provides a novel and feasible strategy for creating unpredictable surface hydrophobicity with self-healing performance by chitosan and tannic acid, inspiring more scholars to fabricate hydrophobic surface by hydrophilic materials.