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

Measurements of mass-fraction activity coefficient at infinite dilution of aliphatic and aromatic hydrocarbons, thiophene, alcohols, water, ethers, and ketones in hyperbranched polymer, Boltorn H2004, using inverse gas chromatography

“…Figures 2 and 3 show the natural logarithm of the mass-fraction activity coefficients in the polymer as a function of the inverse absolute temperature for chosen investigated solutes. As we expected, the values of X 1 13 for the series of solutes decrease with an increase of temperature, as was observed for other polymers [34,36,37] and most of the ionic liquids [22][23][24][25][26][27][28][29][30]. The values of X 1 13 for series of solutes decrease with an increase of the solute alkyl chain.…”

“…This fact indicates the predominantly dispersive nature of the interactions of the polymer with the solvents studied. The results obtained in the present work show the lower affinity of n-alkanes to the B-H2004 than for Hybrane 1200 or poly(propyleneimine)dendrimers G1-G3 [36,37].…”

“…The values are of the same range as those for Hybrane 1200 or poly(propyleneimine)dendrimers G1-G3 [36,37]. Values of the partial molar excess enthalpy at infinite dilution, DH E;1 1 and the partial molar Gibbs excess energy at infinite dilution, DG E;1 1 as listed in table 8 are positive and lie within a range between (0 and 10) kJ Á mol À1 .…”

“…For the simple polymer as isotactic poly(1-butene), the values of X 1 13 were from 1 to 4 [34]. For the sucrose monoesters [35], or for the columnar and isotropic phases of poly(propyleneimine) dendrimers (generation 1-3, G1-G3) [36], the mass-fraction activity coefficients values for these polymers X 1 13 were from 4 to 16 and from 1.0 to 5.5, respectively. From the description of the thermodynamic function of the hyperbranched poly(ester amide), Hybrane 1200, the values of X 1 13 were from 1.1 to 6.0 at temperatures higher than T = 348 K [37].…”

Adsorption properties of surface of carbon materials at extremely low coverages

“…These differences determine a degree of energy heterogeneity of the adsorbent surface [3]. Nowadays, IGC takes leading position among the contemporary physicochemical methods for investigation of solid surface [4], solutions of low-and high-molecular compounds [5,6], catalysts [7] etc. owing to possibility of the rigorous thermodynamic substantiation of the found quantities, varying of external conditions (temperature, pressure), and virtually unbounded range of reference adsorbates Various types of carbon black applied in a manufacture as fi llers of polymeric materials and coloring pigments [8] are of great interest for the study of the adsorption activity and energy heterogeneity of the surface.…”