在施加负荷和剪切下,对缩的PMMA刷层的表面力表征
Yutaka Takahashi1, Masashi Mizukami1, Yoshinobu Tsujii2
1New Industry Creation Hatchery Center (NICHe), Tohoku University, Sendai, Miyagi 980-8577, Japan.
Langmuir : the ACS journal of surfaces and colloids
|December 21, 2023
概括
缩聚合物刷 (CPB) 显示了可变的摩擦. 这项研究将它们的结构与剪切下的摩擦联系起来,发现动力学是厚度独立的,外部刷子密度会影响相互透和摩擦.
科学领域:
- 表面科学和部落学.
- 聚合物物理 聚合物物理
- 材料科学 材料科学 材料科学
背景情况:
- 缩聚合物刷 (CPB) 提供了优良的滑性能,但具有可变的摩擦行为.
- 了解CPB结构与剪切下的摩擦之间的关系对于控制它们的性能至关重要.
- 之前的研究强调了CPB摩擦的准备和操作条件的重要性.
研究的目的:
- 在剪切条件下研究聚甲酸 (PMMA) 刷在烯中的结构.
- 为了将CPB的结构性质与其测量的摩擦行为相关联.
- 阐明控制CPB中的摩擦机制,从而实现定制的应用.
主要方法:
- 使用的表面力,共振剪切测量 (RSM) 和折射率测量 (等色序边缘 - FECO).
- 分析了从RSM.S.获得的弹性 (k_s) 和粘性 (b_s) 参数.
- 使用FECO测量确定了PMMA刷的密度分布.
主要成果:
- 与PMMA-接口相比,PMMA-PMMA接口的弹性和粘度参数高于PMMA-接口.
- 在增加剪切幅度下,PMMA-PMMA摩擦参数 (b_s) 变化,而弹性参数 (k_s) 则单调下降.
- 刷子的动力学独立于厚度,较低的外部刷子密度促进了相互透,在剪切下观察到链拉出.
结论:
- 该研究显示,在负载和剪切下CPB的动态不依赖于刷子厚度.
- 膨胀的PMMA刷子的相互透,由较低的外密度促进,在它们的摩擦反应中起着关键作用.
- 通过控制其结构和相互透,可以调节CPB中的摩擦,从而扩大其应用潜力.
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