蒸发诱导的多电解质复杂化:基底波动性和辅溶剂的作用
Jiaying Li1, Martijn Hans Paul de Heer Kloots2, Gerard van Ewijk3
1Membrane Science and Technology, MESA+ Institute for Nanotechnology, University of Twente, Faculty of Science and Technology, P.O. Box 217, 7500 AE Enschede, The Netherlands.
Langmuir : the ACS journal of surfaces and colloids
|January 23, 2024
概括
在聚电解质复合涂层中,基体的蒸发速度较慢,减少了脆性和裂纹. 这种通过水传播的涂层方法,使用二甲基胺而不是氨,显著提高了用于增强应用的薄膜耐用性.
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
- 表面化学 表面化学
背景情况:
- 薄膜形成对于液体配方的无缺陷涂层至关重要.
- 使用聚电解质复合物 (PEC) 薄膜的水性涂层提供了另一种方法.
- 以前的PEC薄膜使用氨,导致由于快速蒸发而易碎和裂纹.
研究的目的:
- 调查较慢的蒸发速度是否可以减轻PEC膜形成期间的压力积累.
- 评估不同基和辅溶剂对薄膜特性和耐久性的影响.
- 通过提高其机械完整性,提高PEC涂料的应用潜力.
主要方法:
- 研究了使用不同蒸发基 (氨与二甲基胺) 和辅溶剂 (DMSO) 的PEC薄膜形成.
- 监控薄膜形成过程,包括蒸发速度和相位分离.
- 在不同的条件下,包括湿度和时间,评估薄膜的破裂和耐用性.
主要成果:
- 通过使用二甲基胺或添加DMSO来降低蒸发速度,在薄膜形成过程中降低了内部应力.
- 用氨制成的薄膜在1小时内破裂,而二甲基胺薄膜在一个月内保持完整.
- 快速的氨蒸发导致了暂时的相位分离 (度),在缓慢蒸发的系统中没有这种情况.
- 所有PEC薄膜都表现出湿度敏感性,这表明仍然存在挑战.
结论:
- 缓慢的蒸发是减少压力的关键,并提高PEC涂层的耐用性.
- 甲基胺和DMSO等辅溶剂为更强大的水性PEC膜提供了有希望的途径.
- 需要进一步的研究来解决这些先进的涂料材料对湿度的敏感性.
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