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Crystalline Alkyl Side Chain Enhanced Hydrophobicity–Oleophobicity for Transparent and Durable Low-Surface-Energy Coatings Based on Short Fluorinated Copolymers
Macromolecules ( IF 5.1 ) Pub Date : 2024-05-23 , DOI: 10.1021/acs.macromol.4c00277
Yi Tan 1, 2 , Fang Wang 1, 2 , Ren-Yi Sun 1 , Meng Wang 1 , Fei Song 1 , Yu-Zhong Wang 1
Affiliation  

Liquid-repellent surfaces anchored with long perfluorinated polymers can attain the desired stable hydrophobicity–oleophobicity but are phased out due to safety and health concerns. Short perfluorinated polymers with low toxicity are ideal substitutes for repellent coatings but are limited by the easily rearranged short fluoroalkyl pendent groups. Here, long hydrocarbons with different side chain lengths are introduced, and a satisfactory low-surface-tension short fluorinated terpolymer with hydrophobicity–oleophobicity (water contact angle of 110°, oil contact angle of 94°) and low contact angle hysteresis (Δθ 22°) is synthesized, which is comparable to the liquid repellency of long perfluorinated substances. The enhanced antiwetting performance is attributed to the smectic B packing structure formed by the long hydrocarbon side chains of the copolymer, which inhibits the surface reconstruction of short fluoroalkyl pendent groups. Furthermore, this short fluorinated copolymer is suitable for preparing transparent and durable hydrophobic coatings that can render various substrates with good liquid repellency. The coated fabric displays strong resistance to cyclic washing, abrasion, tape peeling, chemical corrosion, high-temperature treatment, and UV irradiation while maintaining its antiwetting property, presenting good mechanical robustness and high weather resistance. This work provides a feasible and sustainable design strategy for developing an eco-friendly robust liquid-repellent material.

中文翻译:


基于短氟化共聚物的透明耐用低表面能涂层的结晶烷基侧链增强疏水性-疏油性



用长全氟化聚合物锚定的防液表面可以获得所需的稳定疏水性-疏油性,但由于安全和健康问题而被逐步淘汰。低毒性的短全氟化聚合物是防水涂料的理想替代品,但受到容易重排的短氟烷基侧基的限制。在这里,引入了具有不同侧链长度的长烃,并获得了令人满意的低表面张力短氟化三元共聚物,该三元共聚物具有疏水疏油性(水接触角为110°,油接触角为94°)和低接触角滞后(Δθ∼ 22°)被合成,其拒液性可与长全氟物质相媲美。抗润湿性能的增强归因于共聚物的长烃侧链形成的近晶B堆积结构,抑制了短氟烷基侧基的表面重构。此外,这种短的氟化共聚物适合制备透明且耐用的疏水涂层,可以使各种基材具有良好的拒液性。涂层织物具有很强的耐循环洗涤、耐磨、胶带剥离、化学腐蚀、高温处理和紫外线照射能力,同时保持其抗湿性能,具有良好的机械强度和高耐候性。这项工作为开发环保的坚固防水材料提供了可行且可持续的设计策略。
更新日期:2024-05-23
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