HNTs 改善PVA/CA复合气凝的阻燃和隔热
Taopeng Yang1, Jiayou Xu1, Shu Lv1
1Department of Chemistry & Chemical Engineering, Guangzhou University, Guangzhou 510006, China.
ACS omega
|October 7, 2024
概括
新的聚乙烯醇/甲基酸盐/酸盐纳米管 (PVA/CA/HNTs) 气凝提供优越的阻燃和绝热. 这些先进的多孔材料在极端温度下表现出减少的热释放和出色的性能.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物科学 聚合物科学
- 纳米技术 纳米技术
背景情况:
- 有机多孔材料在建筑,电子和储能方面至关重要.
- 对于具有增强阻燃和绝热性能的材料的需求日益增加.
- 开发具有层次结构的新型多孔材料对于先进的应用至关重要.
研究的目的:
- 用于制备具有层次孔结构的聚乙醇/藻酸盐/酸盐纳米管 (PVA/CA/HNTs) 气凝.
- 为了研究合成的气凝的阻燃和隔热性能.
- 评估这些气凝作为先进的功能材料的潜力.
主要方法:
- 使用冷干燥技术制造PVA/CA/HNTs气凝.
- 使用PVA与酸和酸与化构建双重交叉连接网络.
- 纳入化纳米管 (HNTs) 作为强化剂.
主要成果:
- PVA/CA/HNTs气凝表现出极好的阻燃性能,显著降低了释放热率 (HRR) 和总热释放率 (THR).
- 实现了60%的高限氧指数 (LOI) 和0.040W/m·K的低导热率.
- 证明了特殊的热稳定性,在25分钟的火焰暴露 (800-1000°C) 后,后面表面温度保持在80°C以下.
结论:
- 甲酸盐和甲酸盐 (CA) 的协同作用通过形成密集的碳层来增强阻燃性.
- 由相互透网络和HNT纳米孔形成的等级孔结构有效地减少了热量和物质交换.
- 作为阻燃和隔热材料,PVA/CA/HNTs气凝在建筑,运输和电子行业的应用方面显著有前途.
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