Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 119, Issue 9, Pages 3868-3874Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp5125266
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Exploiting the very recent potentialities of state-of-the-art quantum chemical simulations of crystalline solids, unpolarized Raman spectra of alpha and gamma polymorphs of Nylon-6 obtained through periodic density functional theory calculations are presented for the first time. The computed spectra are compared with the experimental spectra reported in the literature and allow a detailed interpretation to be proposed of the patterns observed, identifying unambiguous Raman marker bands of the different phases. The calculations of single crystal directional intensities gave the further possibility to predict the polarization properties of the Raman spectra of these polymorphs: considering in particular the alpha phase, polarized Raman spectra have been computed and showed a very good agreement with measurements previously reported for uniaxially oriented samples.
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