动态二硫化物键驱动的聚氨微囊的形状适应性自我愈合
Deqiang Liu1, Yinlei Lin1, Jiashang Yin1
1School of Materials and Energy, Foshan University, Foshan, Guangdong, 528000, P. R. China.
Macromolecular rapid communications
|June 10, 2025
概括
这项研究引入了具有动态二硫化物键的新型聚氨微囊,以提高自我愈合能力. 这些创新的微囊在损坏后显示出有效的修复能力,与传统的微囊不同,为先进的自我修复材料铺平了道路.
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:
- 传统的基于异酸盐的微囊具有有限的自我愈合能力,需要先进的修复系统.
- 开发内在自我修复材料对于延长材料寿命和减少浪费至关重要.
研究的目的:
- 设计和合成具有自我愈合特性的新型聚氨微囊 (PU1).
- 将PU1微囊与传统微囊 (PU2) 的自我愈合性能进行比较.
- 评估来自新型微囊的弹性体薄膜的机械性能.
主要方法:
- 新型微囊 (PU1) 的合成,其中包含动态二硫化物键.
- 使用1,4-butanediol的传统微囊 (PU2) 的比较合成.
- 微囊结构,颗粒大小和玻璃过渡温度 (Tg) 的表征.
- 在高温引起的损伤后,自愈效率的评估.
- 对已制备的弹性体薄膜的抗拉强度和破裂延长的评估.
主要成果:
- PU1微体表现出标准的外核心结构,颗粒大小受速度的影响.
- 在PU1微囊中,玻璃过渡温度 (Tg) 为-53.2°C,而PU2.0的温度为-45.0°C.
- 损坏的PU1微囊在60°C下24小时后显示出有效的自我愈合,而PU2显示出最小的自我愈合.
- PU1弹性纤维薄膜的抗拉强度达到7.3 MPa,破裂时的延长率为1450%.
结论:
- 这种新的含有二硫化物键的聚氨微囊 (PU1) 具有内在的自我愈合能力.
- 这种设计克服了传统的外部自我愈合材料的非重复愈合限制.
- 优良的机械性能和PU1的自我修复性能为先进的功能材料提供了一个有前途的方法.
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