Mesomorphism of thermotropic poly(propyleneimine) dendrimers and phase equilibria in systems on their basis

Blokhina, Svetlana V.; Usol’tseva, N. V.; Ol’khovich, Marina V.; Sharapova, Angelica

doi:10.1134/s0965545x08030103

Cited by 7 publications

(11 citation statements)

References 6 publications

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“…The temperatures of melting, transition between liquid crystalline phases, and clarification were determined from maxima of changes in retention parameters. The phase transition temperatures deter mined by the GLC method closely agree with those obtained using differential scanning calorimetry and thermomicroscopy [15]. The standard Rohrschneider sorbates were used to determine polarity of immobile phases based on den drimers at 100°С (Table 2).…”

Section: Resultssupporting

confidence: 63%

“…The mesomorphic properties of dendrimers were studied in [15]. Table 1 contains dendrimer phase transition temperatures obtained in heating samples from the vitreous state.…”

Section: Methodsmentioning

confidence: 99%

“…Molecular weights and phase transition tempera tures of dendrimers G1-G3[15] Note: Cr is the crystalline phase, Col is the columnar mesophase, I is the isotropic phase, N is the number of terminal groups, and T is the phase transition temperature.…”

mentioning

confidence: 99%

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The influence of the generation number of liquid-crystalline polypropyleneimine dendrimers on the sorption of low-molecular-weight compounds

Blokhina

Ol’khovich

Sharapova

2012

Russ. J. Phys. Chem.

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The thermodynamic characteristics of ultimately dilute solutions of n alkanes and n alkanols in columnar and isotropic poly(propyleneimine) dendrimer phases of three generations (G1-G3) were studied by reversed phase gas chromatography. The influence of the structure of dendrimers and the chemical nature and the size of nonmesogen molecules on their ability to be dissolved in liquid crystalline phases is discussed. It was found that the compatibility of low molecular weight compounds with anisotropic phases increased as the number of dendrimer generation grew.

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Section: Resultssupporting

confidence: 63%

“…The mesomorphic properties of dendrimers were studied in [15]. Table 1 contains dendrimer phase transition temperatures obtained in heating samples from the vitreous state.…”

Section: Methodsmentioning

confidence: 99%

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The influence of the generation number of liquid-crystalline polypropyleneimine dendrimers on the sorption of low-molecular-weight compounds

Blokhina

Ol’khovich

Sharapova

2012

Russ. J. Phys. Chem.

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“…The investigations of dendrimeric LCSPs were at their initial stages, but according to the authors opinion [ 40 , 41 ], they were very auspicious. Taking the diversity of the branching of different functional groups in molecules into consideration, there existed the possibility of a strong interaction of dendrimers with the support surface, a relatively low viscosity, satisfactory solubility of different chemical compounds, and good mixability with other LCs.…”

Section: Liquid Crystals Stationary Phases In Gcmentioning

confidence: 99%

“…In the articles [ 40 , 41 , 43 – 45 ], the results of the chromatographic tests performed by employing very short micro-packed columns (40 cm, 1 mm) have been described, being not enough to show that there are sufficiently good separations. The columns efficiencies, employed in these tests, were very low, and the values of the height equivalent to theoretical plates (HETP) were equal up to 8 mm.…”

Section: Liquid Crystals Stationary Phases In Gcmentioning

confidence: 99%

Liquid Crystals as Stationary Phases in Chromatography

et al. 2016

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The most correct analysis of the compositions of diverse analytes mixtures is significant for analytical studies in different fields; however, many prevalent analytes cannot be identified employing traditional partition gas chromatographic methods. Thus, the increasing requirements on analytes of isomeric compounds and the problems encountered in their separation demand a study of more diverse analytical systems which are characterised by higher selectivity. Therefore, the selectivity and polarities of various liquid crystals (rod-like, banana-shape, biforked, oxygen, sulphur, nitrogen, and metal containing molecules, Schiff-base, and polymeric dendrimers) employed as liquid crystalline stationary phases (LCSPs) have been discussed from both points of views, namely, their analytical applications and thermodynamic characteristics of infinitely diluted probes with different acceptor–donor properties. Extreme particular effort has been paid to the different interdependencies between the bound up chemical structures of liquid crystal molecules with their different acceptor–donor properties and the connected resolution capabilities in the interpretation of the probe—LCSP systems, on the basis of the and dependencies, with regard to the LCSP compositions, which have been controlled by the counterbalancing of the enthalpy and entropy factors. The properties of binary systems composed of liquid crystalline poly(propyleneimine) dendrimers—rod-like molecules of liquid crystals and effects of the dendrimer structure, the chemical nature, and molecular size of the non-mesogens on the ability to dissolve in the liquid crystalline phases, have been interpreted. Practical applications of metallomesogenes and chiral stationary phases for analytical separation of different organic substances have also been taken into consideration.

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Thermodynamics of solution in liquid crystalline poly(propyleneimine) dendrimers by inverse gas chromatography

Blokhina

Usol’tseva

Ol’khovich

et al. 2008

Journal of Chromatography A

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Mesomorphism of thermotropic poly(propyleneimine) dendrimers and phase equilibria in systems on their basis

Cited by 7 publications

References 6 publications

The influence of the generation number of liquid-crystalline polypropyleneimine dendrimers on the sorption of low-molecular-weight compounds

The influence of the generation number of liquid-crystalline polypropyleneimine dendrimers on the sorption of low-molecular-weight compounds

Liquid Crystals as Stationary Phases in Chromatography

Thermodynamics of solution in liquid crystalline poly(propyleneimine) dendrimers by inverse gas chromatography

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