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/content/aip/journal/adva/5/10/10.1063/1.4934575
2015-10-20
2016-12-08

Abstract

We present a comparative Density Functional Tight Binding study of structures, energetics, and vibrational properties of α and γ crystalline phases of nylon6 with different types of defects: single and double chain vacancies and interstitials. The defect formation energies are: for a single vacancy 0.66 and 0.64 kcal/mol per monomer, and for an interstitial strand 1.35 and 2.45 kcal/mol per monomer in the α and γ phases, respectively. The presence of defects does not materially influence the relative stability of the two phases, within the accuracy of the method. The inclusion of phononic contributions has a negligible effect. The calculations show that even if it were possible to synthesize the pure phases of nylon6, the defects will be easily induced at room temperature, because vacancy formation energies in both phases are of the order of at room temperature. The formation of interstitial defects, on the contrary, requires the energy equivalent to multiple values and is much less likely; it is also much less probable in the γ phase than in α. The vibration spectra do not show significant sensitivity to the presence of these defects.

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