Reyes-Tesillo Bryanda G, Hernández-Padrón Genoveva, Ferrer-Pérez Jorge A, Maciel-Cerda Alfredo
Posgrado en Ciencia e Ingeniería de Materiales, Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México Campus Juriquilla Querétaro, Querétaro, México.
Departamento de Nanomateriales, Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México Campus Juriquilla Querétaro, Querétaro, México.
PLoS One. 2025 Jan 9;20(1):e0313785. doi: 10.1371/journal.pone.0313785. eCollection 2025.
A hybrid coating made of poly (methyl methacrylate) with SiO2-TiO2 particles (PMMA/SiO2-TiO2) has been developed for use as a coating on nanosatellites, evaluating its resistance to high vacuum by quantifying its weight loss. The coating was applied on an Al 7075 aluminum substrate used for the aerospace sector. PMMA/SiO2-TiO2 hybrid coatings were prepared using sol-gel reaction in situ assisted with sonochemistry. The SiO2 particles and TiO2 (50:50% wt. of rutile/anatase) particles by tetraethyl orthosilicate (TEOS), and Titanium (IV) Isopropoxide (TIPO). Radical polymerization of methyl methacrylate (MMA) monomer was conducted with (3-mercaptopropyl) trimethoxy silane (3-MPTS) used as a coupling molecular agent, and benzoyl peroxide as a catalyst. The coatings obtained have a thickness of 20 μm which were deposited by blade coating technique on the substrate, obtaining homogeneous and defect-free coatings. Adhesion and hardness were measured using ASTM standards required for this sector. To evaluate its resistance to ultra-high vacuum, it was done as close as possible to the ASTM E-595 norm [1], where it indicates that the coatings must be evaluated at vacuum conditions of 10-5 Torr and 125°C for a period of 24 hours. The coatings were evaluated before and after the test by spectroscopy analysis to determine a possible degradation in the chemical structure. The resulting weight loss not exceeding 0.02%, and the addition of Ti-O-Si particles led to an increase in chemical stability under vacuum conditions without affecting the chemical structure of the highly cross-linked PMMA/Ti-O-Si matrix, which was monitored by FTIR and Raman spectroscopy.
一种由聚甲基丙烯酸甲酯与SiO₂-TiO₂颗粒制成的混合涂层（PMMA/SiO₂-TiO₂）已被开发用于纳米卫星涂层，通过量化其重量损失来评估其在高真空环境下的耐受性。该涂层被应用于航空航天领域使用的Al 7075铝基板上。采用超声化学原位辅助的溶胶-凝胶反应制备了PMMA/SiO₂-TiO₂混合涂层。SiO₂颗粒和TiO₂（金红石/锐钛矿重量比为50:50%）颗粒由正硅酸乙酯（TEOS）和异丙醇钛（TIPO）制成。甲基丙烯酸甲酯（MMA）单体的自由基聚合反应以（3-巯基丙基）三甲氧基硅烷（3-MPTS）作为偶联分子剂，过氧化苯甲酰作为催化剂进行。所获得的涂层厚度为20μm，通过刮刀涂布技术沉积在基板上，得到均匀且无缺陷的涂层。使用该领域所需的ASTM标准测量附着力和硬度。为了评估其对超高真空的耐受性，尽可能按照ASTM E-595标准[1]进行，该标准表明涂层必须在10⁻⁵托和125°C的真空条件下评估24小时。通过光谱分析在测试前后对涂层进行评估，以确定化学结构中可能的降解情况。结果表明重量损失不超过0.02%，并且Ti-O-Si颗粒的添加导致在真空条件下化学稳定性增加，同时不影响通过傅里叶变换红外光谱（FTIR）和拉曼光谱监测的高度交联的PMMA/Ti-O-Si基体的化学结构。
