The impact of the length of alkyl chain on the behavior of benzyl alcohol homologues – the interplay between dispersive and hydrogen bond interactions

Abstract

In this work, we examined the effect of length of alkyl chain attached to the benzene ring on the self-assembling phenomena for the series of phenol alcohol (PhA) derivatives, from...

Impact of Nanostructurization of the Pore Walls on the Dynamics of a Series of Phenyl Alcohols Incorporated within Nanoporous Aluminum Oxide Templates

“…The determined values of glass transition temperatures for all systems are listed in Table . As previously discussed, this indicates that the elongation of the alkyl chain in the studied bulk PhAs does not significantly affect T g …”

“…As previously discussed, this indicates that the elongation of the alkyl chain in the studied bulk PhAs does not significantly affect T g . 26 On the other hand, for samples infiltrated into AAO templates of various constant D p the scenario is quite different. For all those materials, we can observe two endothermic signals discussed in the literature as a so-called double glass transition (DGT) phenomenon where both T g values are located above and below the one observed for the bulk material independent of the molecular weight of PhAs and pore diameters (see Figure 1b,c and Figure 1f,g).…”

“…BDS measurements were carried out on heating after a fast quenching of the liquid state in a wide range of temperatures ( T = 175–243 K) and frequencies ( f = 10 –1 –10 6 Hz) using a Novocontrol spectrometer, equipped with an Alpha Impedance Analyzer with an active sample cell and Quatro Cryosystem. Dielectric measurements of bulk samples were performed in a parallel-plate cell (diameter, 15 mm; gap, 0.1 mm) as described in ref . AAO membranes filled with studied alcohols were also placed in a similar capacitor (diameter, 10 mm; membrane thickness, 0.05 mm). , Nevertheless, the confined samples are a heterogeneous dielectric consisting of a matrix and an investigated compound.…”

“…The nanoscale confinement examined in this paper was produced by the two types of the porous anodic aluminum oxide (AAO) matrixes characterized by either (1) constant or (2) modulated pore diameter ( D p ) of comparable sizes labeled herein as const-AAO and modul-AAO, respectively (see Scheme ). Previous studies on the bulk materials revealed that many of their properties, i.e., the degree of association of molecules via hydrogen bonds, the association–dissociation energy, and the glass transition temperature ( T g ), change depending on the length of the alkyl chain according to the “odd–even” effect . This was discussed in terms of the interplay between interactions of the nonpolar and polar parts of the molecules, which was concluded to have a significant influence on the local structure and intra- and intermolecular dynamics of the studied PhAs.…”

“…Previous studies on the bulk materials revealed that many of their properties, i.e., the degree of association of molecules via hydrogen bonds, the association−dissociation energy, and the glass transition temperature (T g ), change depending on the length of the alkyl chain according to the "odd−even" effect. 26 This was discussed in terms of the interplay between interactions of the nonpolar and polar parts of the molecules, which was concluded to have a significant influence on the local structure and intra-and intermolecular dynamics of the studied PhAs. Therefore, it is interesting to see whether similar effects will be observed for the samples confined in mesoporous templates.…”