Tribology Letters

, 4:231 | Cite as

Surface chemistry-mechanical property relationship of low density polyethylene: an IR+visible sum frequency generation spectroscopy and atomic force microscopy study

  • D.H. Gracias
  • D. Zhang
  • Y.R. Shen
  • G.A. Somorjai


Surface-specific IR+visible sum frequency generation (SFG) spectroscopy was used to obtain chemical composition of two polymer surfaces. The SFG surface vibrational spectrum of pure low density polyethylene and that of a commercial sample of the same kind of polymer, which contains additives, are markedly different. This correlates well with the very different surface mechanical properties, i.e., stiffness (indicative of the elastic modulus) and friction, which were measured by atomic force microscopy (AFM) on the same polymer surfaces. The surface of CLDPE is dominated by methoxy (−OCH3) contained additives, segregated from the bulk, which explains a lower stiffness, adhesion and friction of the surface, as measured by AFM.

sum frequency generation (SFG) vibrational spectroscopy atomic force microscopy (AFM) elastic modulus friction additives polyethylene 


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Copyright information

© Kluwer Academic Publishers 1998

Authors and Affiliations

  • D.H. Gracias
  • D. Zhang
  • Y.R. Shen
  • G.A. Somorjai

There are no affiliations available

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