等离子体梯度工程聚硅氧烷涂层：交联增强的原子氧抗性和航天器应用的灵活性

IF 7.3 2区材料科学 Q1 CHEMISTRY, APPLIED

Progress in Organic Coatings Pub Date : 2025-09-06 DOI:10.1016/j.porgcoat.2025.109631

Yi Li, Zhonghua Li, Yanchun He, Shengzhu Cao, Dongfeng Ma, Gong Cheng, Hu Wang, Lin Li, Miao Yang, Lanxi Wang, Lu Yuan, Min Xu

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引用次数: 0

摘要

为了解决用于近地轨道航天器的柔性聚酰亚胺（PI）衬底中原子氧（AO）侵蚀引起的材料降解问题，本研究提出了一种基于氧掺杂聚硅氧烷的等离子体增强化学气相沉积（PECVD）保护涂层设计策略。通过调节六甲基二硅氧烷（HMDSO）与氧（O2）的流量比，制备了不同氧掺杂水平的聚硅氧烷涂层，并系统研究了氧含量对聚硅氧烷涂层化学结构演变、力学性能和抗AO性能的调控机制。实验结果表明，低氧（10% O2）涂层呈现出富甲基的线性硅氧烷结构，具有较高的柔韧性，但抗AO能力较弱。在高氧（50% O2）条件下，SiCH3基团完全氧化形成了三维SiO2网络（Q4结构>； 75%），获得了最佳的抗AO性，但过度的无组织导致脆性和界面分层风险。30% o2掺杂的涂层平衡了有机-无机杂化结构（Q3/Q4比率为58% / 21%），保持了适度的柔韧性（弹性模量：25.4 GPa），同时显著提高了抗AO性（侵蚀率：3.14 × 10−26 cm3/原子），比未涂覆的PI衬底低两个数量级。本研究阐明了等离子体活性氧介导的SiCH3定向氧化和SiOSi梯度交联机制，为极端空间环境下柔性材料功能防护涂层的设计提供了理论框架。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Plasma-gradient engineered polysiloxane coatings: Crosslinking-enhanced atomic oxygen resistance and flexibility for spacecraft applications

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Plasma-gradient engineered polysiloxane coatings: Crosslinking-enhanced atomic oxygen resistance and flexibility for spacecraft applications

To address the issue of atomic oxygen (AO) erosion-induced material degradation in flexible polyimide (PI) substrates used for low Earth orbit (LEO) spacecraft, this study proposes a protective coating design strategy based on oxygen-doped polysiloxane via plasma-enhanced chemical vapor deposition (PECVD). By adjusting the flow ratio of hexamethyldisiloxane (HMDSO) to oxygen (O₂), polysiloxane coatings with varying oxygen doping levels were prepared, and the regulatory mechanisms of oxygen content on the chemical structure evolution, mechanical properties, and AO resistance performance were systematically investigated. Experimental results revealed that low-oxygen (10 % O₂) coatings exhibited a methyl-rich linear siloxane structure, offering high flexibility but weak AO resistance. Under high-oxygen (50 % O₂) conditions, complete oxidation of SiCH₃ groups formed a three-dimensional SiO₂ network (Q⁴ structure >75 %), achieving optimal AO resistance, but excessive inorganicization led to brittleness and interfacial delamination risks. The 30 % O₂-doped coating balanced the organic-inorganic hybrid structure (Q^3/Q⁴ ratios of 58 %/21 %), maintaining moderate flexibility (elastic modulus: 25.4 GPa) while significantly enhancing AO resistance (erosion rate: 3.14 × 10⁻²⁶ cm³/atom), two orders of magnitude lower than uncoated PI substrates. This work elucidates the plasma-activated oxygen-mediated directional oxidation of SiCH₃ and gradient SiOSi crosslinking mechanisms, providing a theoretical framework for designing functional protective coatings for flexible materials in extreme space environments.

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来源期刊

Progress in Organic Coatings 工程技术-材料科学：膜

CiteScore

11.40

自引率

15.20%

发文量

577

审稿时长

48 days

期刊介绍： The aim of this international journal is to analyse and publicise the progress and current state of knowledge in the field of organic coatings and related materials. The Editors and the Editorial Board members will solicit both review and research papers from academic and industrial scientists who are actively engaged in research and development or, in the case of review papers, have extensive experience in the subject to be reviewed. Unsolicited manuscripts will be accepted if they meet the journal''s requirements. The journal publishes papers dealing with such subjects as: • Chemical, physical and technological properties of organic coatings and related materials • Problems and methods of preparation, manufacture and application of these materials • Performance, testing and analysis.