This study discusses the value of polymer electrospun materials in three-dimensional (3D) scaffolds and antibacterial wound dressings for potential dental applications.

Glass transition of the antiferroelectric hexatic smectic phase is reported for the 3F5HPhH6 compound. The relationship between the cold crystallization kinetics and the molecular dynamics is determined.

Dielectric and infrared spectroscopies were employed to study inter-and intramolecular glass-transition dynamics in the series of hyperbranched polyesters of the second, third, and fourth generations. Our study shows that conductivity relaxation becomes increasingly faster than structural relaxation as the glass transition temperature T g is approached, signifying decoupling between translational motions of charges and reorientation of molecules. Depending on the polymer's generation conductivity relaxation times can be up to few orders of magnitude faster than structural dynamics. Because of extensive hydrogen bonding network, the most significant contribution to the total ionic conductivity comes from proton transfer along hydrogen bonds. Decoupling phenomenon was accompanied by narrowing the dispersion of the conductivity relaxation with decreasing temperature that reaches almost exponential decay in the glassy state. Finally, by analyzing the absorption spectra in terms of integral intensity, we have demonstrated significant role of H-bonded moieties in the course of vitrification of investigated materials.

In this study, the oxidation of multiwalled carbon nanotubes (MWCNTs) sonicated and/or refluxed in acids (H2SO4/HNO3) was investigated using a combination of high-resolution transmission electron microscopy, Raman spectroscopy, Fourier transform infrared spectroscopy, and ab initio computational methods.

No abstract

The relaxation dynamics in the thermodynamic states of a glass-forming liquid crystal was studied. The role of the inter- and intramolecular interactions of ester groups during the vitrification process was revealed.

No abstract

No abstract