The Influence of Titanium Dioxide Nanosheet on Water Permeability of Silicone Rubber after Nitrogen Dioxide Aging Treatment

IF 3.2 3区材料科学 Q3 CHEMISTRY, PHYSICAL

Materials Pub Date : 2023-11-12 DOI:10.3390/ma16227138

Xiangyang Peng, Jinshuai Zhang, Jiapeng Fang, Zheng Wang, Zhen Huang, Shilong Kuang, Chunqing He

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Abstract

In this study, the aging process of a surface-functional titanium dioxide nanosheet (f-TNS) composited room-temperature-vulcanized silicone rubber (RTV) composite coating was simulated in a NO2 generation device, and then the electrochemical impedance spectroscopy (EIS) of the aged composite coating was tested in a 3.5% NaCl solution. The water permeation process was analyzed by the changes in the impedance modulus, porosity, and breakpoint frequency of the composite coating. The experimental results show that the water permeability of aged RTV decreases first and then increases with the increase in the composite proportion of f-TNS. When the composite proportion of TNS was 0.3 wt.%, the composite sample had the minimum water permeability and the best resistance to NO2 corrosion. The effect of TNS on the NO2 aging resistance of RTV composites and its mechanism were studied by SEM, FT-IR, and XPS. The impedance modulus and porosity of the aged 0.3% f-TNS/RTV, respectively, were 1.82 × 107 Ω cm2 and 0.91 × 10−4%, which increased by 2.23 times and decreased by 0.37 times, respectively, compared with the values of aged pure RTV sample. In addition, the breakpoint frequency of the aged 0.3% f-TNS/RTV also significantly reduced to 11.3 Hz, whereas it was 35 Hz in aged pure RTV.

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二氧化钛纳米片对二氧化氮老化后硅橡胶透水性的影响

本研究在NO2生成装置中模拟了表面功能二氧化钛纳米片(f-TNS)复合室温硫化硅橡胶(RTV)复合涂层的老化过程，并在3.5% NaCl溶液中测试了老化复合涂层的电化学阻抗谱(EIS)。通过分析复合涂层的阻抗模量、孔隙率和断点频率的变化，分析了水渗透过程。实验结果表明，随着f-TNS复合比例的增加，老化RTV的透水性先降低后增加。当TNS的复合比例为0.3 wt.%时，复合试样的透水性最小，抗NO2腐蚀性能最佳。采用SEM、FT-IR、XPS等手段研究了TNS对RTV复合材料耐NO2老化性能的影响及其机理。老化后0.3% f-TNS/RTV的阻抗模量和孔隙率分别为1.82 × 107 Ω cm2和0.91 × 10−4%，分别比老化后的纯RTV样品增加了2.23倍和减少了0.37倍。此外，老化的0.3% f-TNS/RTV的断点频率也显著降低到11.3 Hz，而老化的纯RTV为35 Hz。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

5.80

自引率

14.70%

发文量

7753

审稿时长

1.2 months

期刊介绍： Materials (ISSN 1996-1944) is an open access journal of related scientific research and technology development. It publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Materials provides a forum for publishing papers which advance the in-depth understanding of the relationship between the structure, the properties or the functions of all kinds of materials. Chemical syntheses, chemical structures and mechanical, chemical, electronic, magnetic and optical properties and various applications will be considered.