提高纤维素纳米纤维素与环氧树脂的兼容性,通过基于水的表面水化策略.
Kevin Oesef1, Emily D Cranston2,3, Yasmine Abdin1
1Department of Materials Engineering, The University of British Columbia, 6350 Stores Road, Vancouver, British Columbia V6T 1Z4, Canada.
ACS applied materials & interfaces
|May 2, 2025
概括
用酸和胺胺对纤维素纳米纤维素 (CNF) 进行疏水,可以提高它们在聚合物复合材料中的兼容性. 这种绿色策略增强了环氧树脂中的机械性能,例如拉伸模量和强度.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
- 纳米技术 纳米技术
背景情况:
- 纤维素纳米纤维 (CNFs) 为复合材料增强提供高特异性强度和模量.
- CNF固有的水友性限制了它们与聚合物矩阵的兼容性,导致聚合和复合材料性能降低.
- 解决CNF的水友性对于释放它们在先进复合材料中的全部潜力至关重要.
研究的目的:
- 开发一种以水为基础的化CNF战略,以提高聚合物复合材料的界面兼容性.
- 研究酸 (TA) 和胺 (HA) 修饰在CNF上的反应机制.
- 评估修改后的CNF对环氧树脂机械性能的影响.
主要方法:
- 采用一式,以水为基础的策略,以使用酸 (TA) 作为原料和胺 (HA) 作为水剂来水CNF,生成CNF-TA-HA.
- 使用接触角测量来确认修改后的CNF的疏水性.
- 用色度测试来研究表面修饰过程的反应动力学.
主要成果:
- 修改后的CNF (CNF-TA-HA) 呈现出100°的稳定水接触角度,表明成功的水化.
- 修饰反应遵循了一种独特的两阶段过程,包括快速的表面反应和缓慢的扩散到CNF捆.
- 与未经修改的CNF相比,将1%重/重的CNF-TA-HA加入到环氧中显著改善了拉伸模量 (36%) 和拉伸强度 (48%).
结论:
- 该TA-HA水化策略有效地提高了环氧复合材料中CNF的界面兼容性.
- 这种绿色和可扩展的方法可以提高复合材料的机械性能,而不会降低CNF的内在特性.
- 该方法可适应各种纤维素纳米材料,为先进的复合材料开发提供了一条途径.
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