Abstract:
Anomalous adhesion behaviour observed in the polydimethylsiloxane/heptane/silica system is reported. This behaviour is characterised by the infrequent appearance of one or more elastic minima which occur in addition to the ever-present primary adhesion. The resulting elastic force is attributed to loops connecting the tip to the substrate and can be described by two models; a worm-like chain, and a freely jointed chain. Both models give similar values for the characteristic segment length of around 0.24 nm and indicate that the chains have been extended by between 90 to 95% of their chain contour length before desorption. In some cases multiple adhesions were observed between tip and substrate and have been used to suggest a method for determining the distribution of adsorbed polymer loops.
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Received: 12 November 1997 / Accepted: 6 March 1998
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Senden, T., di Meglio, JM. & Auroy, P. Anomalous adhesion in adsorbed polymer layers. Eur. Phys. J. B 3, 211–216 (1998). https://doi.org/10.1007/s100510050305
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DOI: https://doi.org/10.1007/s100510050305