On the structure and properties of polyamides. I. Infrared spectra of polycaprolactam

Applicability of Polymeric Materials as Phase Change Materials

“…The γ‐phase, however, is unstable and under equilibrium conditions and at ambient temperature, the crystalline structure consists only of the α‐form . The spectra show an increase of the absorption bands at 1478 and 1416 cm −1 , which correspond to the α‐phase CH 2 scissors vibration . Simultaneously, the spectra show a decrease of the absorption band at 1439 cm −1 , which corresponds to the γ‐phase CH 2 scissors vibration .…”

“…The PA 6 spectra were normalized with the absorption band at 1462 cm −1 , which corresponds to the CH 2 scissors vibration since this band is not sensitive to oxidation . Compared to the unexposed PA 6, a moderate increase in the absorption bands in the wavenumber range from 1780 to 1700 cm −1 , which represents the stretching vibrations of carbonyl groups, an increase in the absorption band at 688 cm −1 , which represents the COOH deformation vibration, changes in the absorption bands in the wavenumber ranges from 1480–1360 cm −1 and 975–850 cm −1 , which represent the CH 2 ‐/amide‐scissors and wag vibrations, and the CO‐NH in plane vibrations of the crystalline α‐ and γ‐phase, were ascertained.…”

Molecular dynamics simulation of the structural and mechanical property changes in the Brill transition of nylon 10/10 crystal

“…An illustration of structural change in the Brill transition of nylon 10/10 crystal derived from the experimental data reported in the literature[22][23][24][25].…”

Strong Orientation of Polymer Chains and Small Photochromic Molecules in Polyamide 6 Electrospun Fibers

“…[21][22][23][24][25][26][27][28] According to Vasanthan's results, [27][28][29] the absorption bands characteristic of the g phase (973 cm À1 ) and of the a phase (930 cm…”