Infrared Band Broadening and Interactions in Polar Systems

An infrared spectroscopic study of hydrogen bonding in ethyl phenol: A model system for polymer phenolics

“…In ordered systems consisting of a finite number of such coupled oscillators, one observes a series of bands of systematically decreasing intensity that map the dispersion curve of the theoretically infinite oscillator chain. In disordered systems, one would expect to see a superposition of the effect of finite chain length and imperfect alignment, resulting in an asymmetric broadening of the observed vibrational mode on the low wavenumber side that in some cases appears as a resolvable shoulder [22,23]. The highly polar nature of hydrogen bonds and their preference for a (more or less) linear alignment would suggest that this might be what we are observing here.…”

Complicated phase behavior and ionic conductivities of PVP-co-PMMA-based polymer electrolytes

“…The stretching band of the ''free'' carbonyl groups of uncomplexed PVP appears at 1680 cm À1 ; this band is asymmetric and significantly broader than those of other noncomplexed carbonyl units [35e37]. For example, Painter and co-workers [38,39] demonstrated that the real ''free'' or ''unperturbed'' carbonyl stretching band of the model compound ethyl pyrrolidone (EPr) occurs at ca. 1708 cm À1 .…”

Acoustic analysis of composite soft materials III: Compressibility of boundary layers around particles of mica and calcium carbonate

“…As it can be seen, the predominant carbonyl absorbance is the one representing the aldehyde group around the wavenumber 1,730 cm −1 as is the only one present in all the samples analyzed, being the ABS‐ g‐ Ma matrix the one with the lowest frequency at 1,726 cm −1 and ABS‐ g‐ Ma/APOSS the one with the highest frequency at 1,733 cm −1 . This phenomenon has been previously documented and the higher wavenumbers can be assigned to an enhancement of dipole–dipole interaction between the ABS matrix chains [20, 21].…”