This article is cited in 4 papers

Surfaces, Electron and Ion Emission

Chemical bond strain in molecules of polyamide 6 coatings on the steel surface

V. I. Vettegren^a, S. A. Ivankov^b, R. I. Mamalimov<sup>a

a</sup> Ioffe Institute, St. Petersburg
^b St. Petersburg Polytechnic University

Abstract: The structure and stresses of chemical bonds in a 20 $\mu$m thick polyamide 6 (PA 6) coating on the steel surface are studied by IR spectroscopy. It is found that PA 6 molecules in the coating are oriented parallel to the metal surface and the content of metastable crystalline $(\gamma)$ and mesomorphic $(\beta)$ phases in it is twice as low as in PA 6 films. In the crystalline $\alpha$ phase, the molecular skeleton is compressed and “lateral” (respective to the skeleton) chemical bonds are extended. In the mesomorphic $\beta$ phase, the concentration of overstressed (extended to a prerupture state) parts in the molecular skeleton is higher than in the film. These effects are explained by a change in the PA 6 low-frequency vibration spectrum at the PA 6-metal interface.

Received: 01.03.2011

 English version: Technical Physics, 2011, 56:10, 1487–1493

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