Combinatorial Broadening Mechanism of O–H Stretching Bands in H-Bonded Molecular Clusters

Abstract

A new mechanism for combinatorial broadening of donor-OH stretching-vibration absorption bands in molecular clusters with H-bonds is proposed. It enables the experimentally observed increase of the O-H stretching-vibration bandwidth with increasing number of molecules in H-bonded clusters to be explained. Knowledge of the half-width of the OH stretching-vibration absorption band in the dimer and the number of H-bonds in the analyzed cluster is suffi cient in the zeroth-order approximation to estimate the O-H stretching-absorption bands in clusters containingseveral molecules. Good agreement between the calculated and published experimental half-widths of the OH stretching-vibration absorption bands in MeOH and PrOH clusters was obtained using this approach.

Thermal annealing effects on the mechanical properties of bio-based 3D printed thermosets

“…This might indicate a higher amount of hydrogen bonded -OH groups, as well as increased relaxation of the -OH excited vibrational state. 56 To further confirm the incorporation of the components into the network, gel content and swelling experiments were conducted. The results from these experiments are provided in Fig.…”

Thermal Annealing Effects on the Mechanical Properties of Bio-based 3D Printed Thermosets

“…This might indicate a higher amount of hydrogen bonded -OH groups, as well as increased relaxation of the -OH excited vibrational state. 47 To further confirm the incorporation of the components into the network, gel content and swelling experiments were conducted. The results from these experiments are provided in figures S14-S17, and the gel content percentages of all formulations are mostly above 85%, which indicates high crosslinking and good network incorporation.…”