化学设计和微相分离有机硅/酚醛树脂双网络气凝胶优越的灵活性和绝热

IF 8.1 2区 材料科学 Q1 ENGINEERING, MANUFACTURING
Qi You , Xiaolin Liu , Yichen Ou , Ya Zhong , Zhongyang Wu , Yiqi Zhao , Sheng Cui
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引用次数: 0

摘要

柔性气凝胶在航空航天和建筑应用中发挥着重要作用。然而,制造具有灵活性、自清洁能力和抗冻性的耐热气凝胶仍然具有挑战性。通过将柔性长链硅烷策略性地整合到刚性气凝胶网络中,同时通过微观相分离精确调整骨架和孔隙结构,我们显著提高了酚醛树脂气凝胶(PRAs)的灵活性和功能性。微纳米结构调节了独特的网状结构,使气凝胶具有高度的柔韧性和绝热性。所制备的柔性气凝胶具有优异的变形性能(高达90%的损伤应变)和良好的抗疲劳性能(40%应变下的>;500次压缩循环),同时保持超低密度(0.052 g·cm−3)和低导热系数(0.0364 W·m−1·K−1)。它还表现出有趣的自清洁和抗冻性能。由于其优异的热稳定性,这种柔性气凝胶适用于220°C以下的静态隔热材料。值得注意的是,它是一种出色的节能建筑材料:用这种柔性气凝胶建造的房屋模型即使在低至- 12°C的寒冷环境中也能保持15°C的室内温度。独特的性能组合使这种柔性气凝胶成为建筑和航空航天应用中非常有前途的隔热材料。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Chemical design and microphase separation of silicone/phenolic resin double-network aerogels for superior flexibility and thermal insulation
Flexible aerogels play an important role in aerospace and architectural applications. However, it remains challenging to fabricate thermostable aerogels that combine flexibility, self-cleaning capability, and freeze resistance. Here, by strategically incorporating flexible long-chain silanes into the rigid aerogel network while precisely adjusting the skeleton and pore structure through microcosmic phase separation, we significantly improved both the flexibility and functionality of phenolic resin aerogels (PRAs). The micro nano structure regulated a unique network structure that made the aerogel highly flexible and thermal insulating. The as-prepared flexible aerogel exhibited outstanding deformability (up to 90 % damage strain) and great fatigue resistance (>500 compression cycles at 40 % strain), while maintaining ultra-low density (0.052 g·cm−3) and low thermal conductivity (0.0364 W·m−1·K−1). It also showed interesting self-cleaning and frost resistance properties. Thanks to its excellent thermal stability, this flexible aerogel is suitable for use as static thermal insulation below 220°C. Remarkably, it serves as an outstanding energy-saving building material: the house model constructed with this flexible aerogel maintained an indoor temperature of 15°C even in frigid environments as low as −12 °C. The unique combination of properties makes this flexible aerogel a highly promising thermal insulation material for both construction and aerospace applications.
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来源期刊
Composites Part A: Applied Science and Manufacturing
Composites Part A: Applied Science and Manufacturing 工程技术-材料科学:复合
CiteScore
15.20
自引率
5.70%
发文量
492
审稿时长
30 days
期刊介绍: Composites Part A: Applied Science and Manufacturing is a comprehensive journal that publishes original research papers, review articles, case studies, short communications, and letters covering various aspects of composite materials science and technology. This includes fibrous and particulate reinforcements in polymeric, metallic, and ceramic matrices, as well as 'natural' composites like wood and biological materials. The journal addresses topics such as properties, design, and manufacture of reinforcing fibers and particles, novel architectures and concepts, multifunctional composites, advancements in fabrication and processing, manufacturing science, process modeling, experimental mechanics, microstructural characterization, interfaces, prediction and measurement of mechanical, physical, and chemical behavior, and performance in service. Additionally, articles on economic and commercial aspects, design, and case studies are welcomed. All submissions undergo rigorous peer review to ensure they contribute significantly and innovatively, maintaining high standards for content and presentation. The editorial team aims to expedite the review process for prompt publication.
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