通过静电纺丝、旋涂和电喷雾技术沉积的超疏水和防腐聚四氟乙烯及聚丙烯酸 + β - 环糊精复合涂层的新颖设计

Novel Design of Superhydrophobic and Anticorrosive PTFE and PAA + β - CD Composite Coating Deposited by Electrospinning, Spin Coating and Electrospraying Techniques.

作者信息

Vicente Adrián, Rivero Pedro J, Urdiroz Unai, García Paloma, Mora Julio, Palacio José F, Palomares F Javier, Rodríguez Rafael

机构信息

Engineering Department, Campus de Arrosadía S/N, Public University of Navarre, 31006 Pamplona, Spain.

Institute for Advanced Materials and Mathematics (INAMAT2), Campus de Arrosadía S/N, Public University of Navarre, 31006 Pamplona, Spain.

出版信息

Polymers (Basel). 2022 Oct 16;14(20):4356. doi: 10.3390/polym14204356.

Abstract

A superhydrophobic composite coating consisting of polytetrafluoroethylene (PTFE) and poly(acrylic acid)+ β-cyclodextrin (PAA + β-CD) was prepared on an aluminum alloy AA 6061T6 substrate by a three-step process of electrospinnig, spin coating, and electrospraying. The electrospinning technique is used for the fabrication of a polymeric binder layer synthesized from PAA + β-CD. The superhydrophilic characteristic of the electrospun PAA + β-CD layer makes it suitable for the absorption of an aqueous suspension with PTFE particles in a spin-coating process, obtaining a hydrophobic behavior. Then, the electrospraying of a modified PTFE dispersion forms a layer of distributed PTFE particles, in which a strong bonding of the particles with each other and with the PTFE particles fixed in the PAA + β-CD fiber matrix results in a remarkable improvement of the particles adhesion to the substrate by different heat treatments. The experimental results corroborate the important role of obtaining hierarchical micro/nano multilevel structures for the optimization of superhydrophobic surfaces, leading to water contact angles above 170°, very low contact angle of hysteresis (CAH = 2°) and roll-off angle (αroll−off < 5°). In addition, a superior corrosion resistance is obtained, generating a barrier to retain the electrolyte infiltration. This study may provide useful insights for a wide range of applications.

摘要

通过静电纺丝、旋涂和电喷雾三步工艺,在铝合金AA 6061T6基底上制备了一种由聚四氟乙烯(PTFE)和聚丙烯酸+β-环糊精(PAA +β-CD)组成的超疏水复合涂层。静电纺丝技术用于制备由PAA +β-CD合成的聚合物粘结剂层。静电纺丝的PAA +β-CD层的超亲水性使其适用于在旋涂过程中吸收含有PTFE颗粒的水悬浮液,从而获得疏水性能。然后,对改性PTFE分散液进行电喷雾形成一层分布的PTFE颗粒,其中颗粒彼此之间以及与固定在PAA +β-CD纤维基质中的PTFE颗粒之间的强键合通过不同的热处理显著提高了颗粒与基底的附着力。实验结果证实了获得分级微/纳多级结构对于优化超疏水表面的重要作用,导致水接触角大于170°,接触角滞后(CAH = 2°)和滚落角(αroll-off < 5°)非常低。此外,还获得了优异的耐腐蚀性,形成了阻止电解质渗透的屏障。该研究可为广泛的应用提供有用的见解。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a7e5/9612328/bfbc2bee67c6/polymers-14-04356-g001.jpg

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