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<p>We tested loading-unloading curves using nanoindentation and studied the mechanical properties of six polymer films, including polyethylene (PE), polypropylene (PP), polymethyl methacrylate (PMMA), Polytetrafluoroethylene (PTFE), polyethylene terephthalate (PET), and polyimide (PI). The loading-unloading curve is assumed to comprehensively reflect the relationship between intermolecular forces and intermolecular distances in polymer materials, and the force between organic molecules is usually the van der Waals force. We introduce the Lennard-Jones potential to describe the potential energy between the molecules of these materials and derive the intermolecular force as a function of the intermolecular distance. By fitting this relationship to the measured loading-unloading curves, it was found that they were consistent. Using the obtained fitting parameters, we calculated four mechanical parameters related to film compression: the binding energy between molecules on both sides of the cross-section per unit area (related to toughness); the binding force between molecules on both sides of the cross-section per unit area (related to strength); reduced Young’s modulus (related to stiffness); the total stretching distance between adjacent molecules stretched from the equilibrium position to the position where the binding force is maximum (related to the stretch performance of the material). The measured reduced modulus of PE, PP, PMMA, PTFE, PET, and PI films under zero stress/strain are 608.0, 42.8, 906.5, 36.1, 11.2, and 11.8&#xa0;MPa, respectively. This research has the potential to develop an advanced and user-friendly universal testing tool for material mechanics, which can be utilized for sensing in robotics.</p>

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Compressive mechanical properties of organic films

  • 期刊论文

  • 发表日期：

    2025年12月12日

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  • Gaoyu Zhong,
  • Fei Ye,
  • Baifan Qian,
  • ShuaiShuai Du,
  • Shuhui Li,
  • Zhiyi Wei,
  • Luchao Wu

摘要

We tested loading-unloading curves using nanoindentation and studied the mechanical properties of six polymer films, including polyethylene (PE), polypropylene (PP), polymethyl methacrylate (PMMA), Polytetrafluoroethylene (PTFE), polyethylene terephthalate (PET), and polyimide (PI). The loading-unloading curve is assumed to comprehensively reflect the relationship between intermolecular forces and intermolecular distances in polymer materials, and the force between organic molecules is usually the van der Waals force. We introduce the Lennard-Jones potential to describe the potential energy between the molecules of these materials and derive the intermolecular force as a function of the intermolecular distance. By fitting this relationship to the measured loading-unloading curves, it was found that they were consistent. Using the obtained fitting parameters, we calculated four mechanical parameters related to film compression: the binding energy between molecules on both sides of the cross-section per unit area (related to toughness); the binding force between molecules on both sides of the cross-section per unit area (related to strength); reduced Young’s modulus (related to stiffness); the total stretching distance between adjacent molecules stretched from the equilibrium position to the position where the binding force is maximum (related to the stretch performance of the material). The measured reduced modulus of PE, PP, PMMA, PTFE, PET, and PI films under zero stress/strain are 608.0, 42.8, 906.5, 36.1, 11.2, and 11.8 MPa, respectively. This research has the potential to develop an advanced and user-friendly universal testing tool for material mechanics, which can be utilized for sensing in robotics.