在离子液体中形成玻璃的聚合物的表面流动性
Xinyu Zhang1, Christian Pedersen2,3, Haoqi Zhu1
1Department of Physics, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR 999077, China.
Macromolecules
|March 2, 2026
概括
离子液体减缓了聚合物表面动态,即使在玻璃过渡温度 (Tg) 以下. 然而,一种类似液体的表面层仍然存在,表明聚合物保留了固有的动态异质性.
科学领域:
- 聚合物科学 聚合物科学
- 材料科学 材料科学 材料科学
- 物理化学 物理化学
背景情况:
- 玻璃型聚合物在其自由表面表现出增强的细分动力学,形成一种类似液体的层.
- 这一表面层降低了纳米尺寸的聚合物样本中的玻璃过渡温度 (Tg).
- 已知离子液体可能抑制聚合物中增强的表面动态.
研究的目的:
- 为了研究离子液体对离子-液体-聚合物界面的聚合物动态的影响.
- 为了比较离子液体中的聚合物表面动态与真空.
主要方法:
- 测量浸泡在离子液体中的纳米尺寸阶段聚乙烯薄膜的表面平衡.
- 将这些结果与真空中聚烯薄膜进行比较.
- 使用适当的边界条件的薄膜方程的数值解.
主要成果:
- 离子液体显著减缓了聚乙烯薄膜的表面平面化过程,在玻璃过渡温度 (Tg) 以上和以下.
- 观察到一种类似液体的表面层存在于Tg以下,即使沉浸在离子液体中.
- 数值建模表明,聚乙烯薄膜在离子液体中的表面流动性可以与真空中的表面流动性相比较.
结论:
- 离子液改变了聚合物流程,但并没有消除玻璃型聚合物的固有动态异质性.
- 类似液体的表面层是玻璃型聚合物的关键特征,在有离子液体的情况下仍然存在.
- 离子液体中的表面动态,虽然经过修改,但保留了聚合物的内在行为特征.
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