Narayama, Ifu and Akabori, Keiichi and Morita, Hiroshi and Nagamura, Toshihiko and Tanaka, Keiji (2009) Nanoscopic adhesion test for polymers by a light-lever system. Journal of Physics: Conference Series, 184 (1). 012032.
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Official URL: http://stacks.iop.org/1742-6596/184/i=1/a=012032
Polymer nano-adhesion between a cantilever tip coated with polymer and a flat polymer film was studied by a light-lever system using an atomic force microscope. The polymer interface was adhered at a temperature above the surface glass transition temperature for a given time. Nano-adhesion force ( F nano ), at which the tip was detached from the surface, was estimated from the deflection of the lever with a known spring constant. Nano-adhesion strength ( G N ) was simply obtained dividing F nano by the contact area, which was estimated on the basis of Johnson-Kendall-Roberts theory. The time evolution of the interfacial thickness was independently examined by dynamic secondary ion mass spectrometry. Interestingly, G N increased with increasing interfacial thickness. However, it can be hardly judged whether G N is proportional to the interfacial thickness with the exponent of 1 or 2. Then, temperature dependence of G N was examined. Above the bulk glass transition temperature, the relation between temperature and G N was well expressed by a Williams-Landel-Ferry type equation. This means that the nano-adhesion strength is governed by friction between segments. Once this is accepted, G N should be proportional to the interfacial thickness with the exponent of 2.
|Deposited By:||Prof. Alexey Ivanov|
|Deposited On:||02 Nov 2011 00:09|
|Last Modified:||02 Nov 2011 00:47|
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