Scan-Induced Patterning in Glassy Polymer Films: Using Scanning Force Microscopy To Study Plastic Deformation at the Nanometer Length Scale
Scan-Induced Patterning in Glassy Polymer Films: Using Scanning Force Microscopy To Study Plastic Deformation at the Nanometer Length Scale
复制标题
玻璃状聚合物薄膜中的扫描诱导图案：使用扫描力显微镜研究纳米长度尺度的塑性变形
DOI：
10.1021/la015769j
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发表时间：
2003
期刊：
影响因子：
3.9
通讯作者：
W. Gladfelter
中科院分区：
文献类型：
--
作者：
R. Schmidt;G. Haugstad;W. Gladfelter
研究了聚苯乙烯和聚醋酸乙烯酯玻璃薄膜对光栅扫描滑动 SFM 尖端的响应。讨论了先前提出的几种熟悉的扫描诱导模式的机制。薄膜体积和摩擦响应的增加被量化，并表明观察到的尖端引起的塑性变形可能与滑动尖端下方的二级相变（玻璃到橡胶）有关。对扫描引起的图案的分析表明了观察到的塑性变形的银纹机制。检查薄膜对塑性变形的敏感性，将其作为扫描几何形状、施加的载荷以及保持恒定施加载荷的反馈环路的增益的函数。定义了称为粗糙化敏感性的经验量，并显示其与扫描条件的变化呈线性关系。粗糙化敏感性在量化对扫描历史和负载的依赖性方面非常稳健。这一发现将被进一步利用...
The response of thin glassy films of polystyrene and poly(vinyl acetate) to a raster-scanned, sliding SFM tip was investigated. Several of the previously proposed mechanisms of the familiar scan-induced patterns are discussed. Increases in film volume and frictional response are quantified, and suggest that the observed tip-induced plastic deformation may relate to a second-order phase transition (glass-to-rubber) beneath the sliding tip. Analysis of the scan-induced patterns suggests a crazing mechanism for the observed plastic deformation. The susceptibility of the film to plastic deformation was examined as a function of scan geometry, applied load, and the gain of the feedback loop that maintains a constant applied load. An empirical quantity called the roughening susceptibility is defined and shown to be linear with respect to variations in the scan conditions. The roughening susceptibility is highly robust in quantifying the dependences on scan history and load. This finding will be further exploite...