通过盒式设计优化石墨烯纳米板块强化环氧纳米复合材料的统计优化,以获得卓越的柔性和动态机械性能
Júlia Mendes1, Camila Prudente Magalhães1, Letícia Vitorazi1
1Materials and Metallurgical Engineering Department, Federal Fluminense University, Rio de Janeiro 27255-125, Brazil.
Polymers
|December 11, 2025
概括
在环氧复合材料中的优化石墨烯纳米板块 (GNPs) 显著提高了机械和热性能. 最好的配方实现了197%的屈曲强度增加和更好的热稳定性.
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:
- 石墨烯纳米板块 (GNPs) 为环氧树脂增强提供了出色的机械和热性能.
- 环氧树脂被广泛使用,但通常需要对要求高的应用进行性能增强.
研究的目的:
- 使用石墨烯纳米板块 (GNP) 优化DGEBA/TETA环氧纳米复合材料的配方.
- 调查GNP含量,硬化剂度和硬化后温度对复合材料性能的综合影响.
- 通过使用综合性表征技术,建立结构-属性相关性.
主要方法:
- 采用盒式设计 (BBD) 来研究三个因素:GNP含量 (0.5-3.5 wt.%),硬化剂度 (9-17 phr) 和硬化后温度 (30-120 °C).
- 进行了机械 (柔性测试),动态机械 (DMA),热 (TGA,DSC) 和形态 (FTIR,SEM,TEM,AFM) 分析.
- 使用统计分析来确定每个因素对复合材料特性的重要性.
主要成果:
- 优化的配方 (2.0重量% GNP,9phr硬化剂,120°C硬化后) 显示出显著的改善:屈曲强度 (322.0 MPa,+197%),屈曲模量 (9.7 GPa,+155%),以及破裂时的应变 (4.4%,+91%).
- 动态机械分析显示存储模量增加到7.5GPa,玻璃过渡温度 (Tg) 为143°C.
- 热重力测量分析 (TGA) 显示,热稳定性得到了15°C的改善,固化后的温度被确定为Tg,刚性和热稳定性的主导因素.
结论:
- 优化石墨烯纳米板块 (GNPs) 与石墨烯氧化物 (GO) 和碳纳米管 (CNT) 相比,为环氧纳米复合材料提供了优越的多功能增强.
- 该研究展示了一种强大的方法,用于开发具有较低填充剂含量的高性能环氧纳米复合材料.
- 这些发现突出了定制环氧纳米复合材料的潜力,这些纳米复合材料具有显著改善的机械和热特性,可用于先进的应用.
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