氧化衰老对碳纳米管-青纳米复合体接口的双重影响:增强和恶化
1Tongji University, College of Civil Engineering, Department of Structural Engineering, Shanghai 200092, P. R. China.
Langmuir : the ACS journal of surfaces and colloids
|September 18, 2023
概括
对碳纳米管 (CNT) -青纳米复合材料的氧化衰老双重效应进行了分析. 老化增强了CNT与青的结合性和高温耐受性,但由于改变了接口性质,减少了裂纹耐受性.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 化学工程是化学工程的重要组成部分.
背景情况:
- 碳纳米管 (CNT) -青纳米复合材料的氧化老化是一个复杂的挑战,具有有益和有害的影响.
- 了解CNT-青接口老化的双重机制对于优化复合材料性能至关重要.
研究的目的:
- 为了研究氧化衰老对CNT-青纳米复合材料接口的双重影响.
- 阐明在氧化衰老下增强和恶化的独特机制.
主要方法:
- 一种结合密度函数理论 (DFT) 和分子动力学 (MD) 模拟的多尺度合方法.
- 微观接口观测 (SEM,AFM) 和宏观性质测试.
- 福里埃变换红外光谱 (FTIR) 用于化学验证.
主要成果:
- 氧化老化增强了CNT-青结合能和没有化学反应的界面电荷转移.
- 老化增加了界面剪切和能量障碍,提高了高温变形阻力,分别为5%和45%.
- 增加的极性分子和因衰老而破坏的CNT网络会使表面粘附率降低40%左右,并降低裂纹抵抗力.
结论:
- 氧化老化表现出明显的机制来增强界面结合和高温性能,同时降低CNT-青纳米复合材料的裂纹抵抗.
- 该研究阐明了复杂的复合材料界面的老化行为,为青老化和复合材料设计提供了基础的见解.
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