Effect of carboxyl on wettability and anti-fingerprint capacity of transparent chitin nanofiber coatings modified using fluorosilane

IF 2.3 4区材料科学 Q2 CHEMISTRY, APPLIED

Journal of Coatings Technology and Research Pub Date : 2024-04-10 DOI:10.1007/s11998-024-00920-9

Peizhuang Wang, Li Zhang, Zhiqing Hu, Jiaqi Shang, Jiang Zhou

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Abstract

Chitin nanofibers (ChNFs) with different numbers of carboxyls (i.e., with different degree of substitute, DS) were prepared by adjusting the amount of maleic anhydride used in the acylation treatment prior to mechanical nanofibrillation with ultrasound. Transparent coatings were fabricated by using the obtained ChNFs through casting method and modified via vapor deposition by using 1H, 1H, 2H, 2H-perfluorodecyltrichlorosilane (PFDTS). Hydro-oleophobicity and anti-fingerprint capacity of the ChNF coatings were studied. It was found that the ChNF coatings with more carboxyls possessed stronger hydro-oleophobicity as well as anti-fingerprint capacity after the modification of PFDTS deposition. Analysis of X-ray photoelectron spectroscopy suggested that more PFDTS molecules were grafted onto the ChNF coating surface when the ChNFs had more carboxyls (with higher DS). It is the number of carboxyls rather than hydroxyls on ChNF coating surface that determines hydro-oleophobicity and anti-fingerprint capacity of the ChNF coating surface after the modification of the PFDTS deposition.

Graphical abstract

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羧基对使用氟硅烷改性的透明甲壳素纳米纤维涂层的润湿性和抗指纹能力的影响

在用超声波进行机械纳米纤维化之前，通过调整酰化处理中马来酸酐的用量，制备了具有不同羧基数量（即不同替代度，DS）的甲壳素纳米纤维（ChNFs）。利用获得的 ChNFs 通过浇铸法制备透明涂层，并使用 1H、1H、2H、2H-全氟癸基三氯硅烷（PFDTS）通过气相沉积进行改性。研究了 ChNF 涂层的疏水性和抗指纹能力。结果发现，经 PFDTS 沉积改性后，羧基较多的 ChNF 涂层具有更强的疏水性和抗指纹能力。X 射线光电子能谱分析表明，当 ChNF 的羧基数越多（DS 越高），则接枝到 ChNF 涂层表面的 PFDTS 分子越多。决定 PFDTS 沉积改性后 ChNF 涂层表面疏水性和抗指纹能力的是 ChNF 涂层表面的羧基数量而不是羟基数量。

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来源期刊

Journal of Coatings Technology and Research 工程技术-材料科学：膜

CiteScore

4.30

自引率

8.70%

发文量

130

审稿时长

2.5 months

期刊介绍： Journal of Coatings Technology and Research (JCTR) is a forum for the exchange of research, experience, knowledge and ideas among those with a professional interest in the science, technology and manufacture of functional, protective and decorative coatings including paints, inks and related coatings and their raw materials, and similar topics.