Effect of the molecular weight on deformation states of the polystyrene film by AFM single scanning

Authors

  • Yang Sun,

    1. Key Laboratory of Micro-systems and Micro-structures Manufacturing of Ministry of Education, Harbin Institute of Technology, Harbin, Heilongjiang, P. R. China
    2. Center for Precision Engineering, Harbin Institute of Technology, Harbin, Heilongjiang,, P. R. China
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  • Yongda Yan,

    Corresponding author
    1. Key Laboratory of Micro-systems and Micro-structures Manufacturing of Ministry of Education, Harbin Institute of Technology, Harbin, Heilongjiang, P. R. China
    2. Center for Precision Engineering, Harbin Institute of Technology, Harbin, Heilongjiang,, P. R. China
    • Address for reprints: Yongda Yan, P.O. Box 413, Harbin Institute of Technology, Harbin, Heilongjiang 150001, P. R. China.

      E-mail: yanyongda@yahoo.com.cn

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  • Yingchun Liang,

    1. Key Laboratory of Micro-systems and Micro-structures Manufacturing of Ministry of Education, Harbin Institute of Technology, Harbin, Heilongjiang, P. R. China
    2. Center for Precision Engineering, Harbin Institute of Technology, Harbin, Heilongjiang,, P. R. China
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  • Zhenjiang Hu,

    1. Center for Precision Engineering, Harbin Institute of Technology, Harbin, Heilongjiang,, P. R. China
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  • Xuesen Zhao,

    1. Center for Precision Engineering, Harbin Institute of Technology, Harbin, Heilongjiang,, P. R. China
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  • Tao Sun,

    1. Center for Precision Engineering, Harbin Institute of Technology, Harbin, Heilongjiang,, P. R. China
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  • Shen Dong

    1. Center for Precision Engineering, Harbin Institute of Technology, Harbin, Heilongjiang,, P. R. China
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  • Contract grant sponsor: Foundation for National Science Foundation of China; Contract grant numbers: 51275114, 51222504; Contract grant sponsor: Author of National Excellent Doctoral Dissertation of P. R. China; Contract grant number: 201031; Contract grant sponsor: Program for New Century Excellent Talents in University; Contract grant number: NCET-11–0812.

Summary

Nanobundles patterns can be formed on the surface of most thermoplastic polymers when the atomic force microscope (AFM)-based nanomechanical machining method is employed to scratch their surfaces. Such patterns are reviewed as three-dimensional sine-wave structures. In the present study, the single-line scratch test is used firstly to study different removal states of the polystyrene (PS) polymer with different molecular weights (MWs). Effects of the scratching direction and the scratching velocity on deformation of the PS film and the state of the removed materials are also investigated. Single-wear box test is then employed to study the possibility of forming bundle structures on PS films with different MWs. The experimental results show that the state between the tip and the sample plays a key role in the nano machining process. If the contact radius between the AFM tip and the polymer surface is larger than the chain end-to-end distance, it is designated as the “cutting” state that means the area of both side ridges is less than the area of the groove and materials are removed. If the contact radius is less than the chain end-to-end distance, it is designated as the “plowing” state that means the area of both side ridges is larger than the area of the groove and no materials are removed at all. For the perfect bundles formation on the PS film, the plowing state is ideal condition for the larger MW polymers because of the chains’ entanglement. SCANNING 35:308-315, 2013. © 2012 Wiley Periodicals, Inc.

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