Atomic force microscopy nanoindentation kinetics and subsurface visualization of soft inhomogeneous polymer,Microscopy Research and Technique

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Atomic force microscopy nanoindentation kinetics and subsurface visualization of soft inhomogeneous polymer
Microscopy Research and Technique ( IF 2.0 ) Pub Date : 2021-03-13 , DOI: 10.1002/jemt.23751
Ilya A Morozov ₁

Affiliation

Modern techniques of nanoindentation by atomic force microscopy (AFM) produce maps of topography and physical-mechanical properties of the material. Analysis of the interaction rate of the AFM tip with the soft surface reveals the surface and subsurface structure and expands standard analysis of the material behavior. Phase-separated polymer (polyurethane, elastic modulusâ€”6 MPa) is studied. Reversible inelastic changes of the surface at different stages of indentation were established in dependence on peculiarities of velocity and position of the AFM-tip in the material: uniform soft nanofilm covering the outer surface gradually passes into fibrillar heterogeneous structure of the polymer. The point of stable mechanical contact is defined, and the elastic moduli of soft and hard blocks of the polymer are estimated using certain intervals of the indentation. The presented methods of surface analysis are useful in the study of a wide class of soft heterogeneous materials.

中文翻译：

软非均质聚合物的原子力显微镜纳米压痕动力学和亚表面可视化

通过原子力显微镜 (AFM) 进行的现代纳米压痕技术可生成材料的形貌和物理机械特性图。对 AFM 尖端与软表面的相互作用率的分析揭示了表面和亚表面结构，并扩展了材料行为的标准分析。研究了相分离聚合物（聚氨酯，弹性模量 - 6 MPa）。在压痕的不同阶段，表面的可逆非弹性变化取决于材料中 AFM 尖端的速度和位置的特性：覆盖外表面的均匀软纳米膜逐渐进入聚合物的原纤维异质结构。定义了稳定的机械接触点，聚合物软、硬嵌段的弹性模量通过一定的压痕间隔来估计。所提出的表面分析方法可用于研究范围广泛的软异质材料。

更新日期：2021-03-13

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