A thermodynamic study to evidence the -dichloroalkane/ block copolymer mixed aggregates formation: Effect of the copolymer architecture

Copolymers sensitive to temperature and pH in water and in water+oil mixtures: A DSC, ITC and volumetric study

“…The effect on CMT is specific of the oil nature; in fact, at fixed alkyl chain, 1-chloropropane and 1-nitropropane exercise the more relevant variation and within the a,x-dichloroalkanes series the more hydrophobic oil. Similar results were obtained for Pluronics and the formation of mixed micelles was invoked to explain the experimental findings [15,32,33,37,38]. The DH M values are positive and are not influenced by the presence of oils.…”

“…The V U;o values in the presence of T1107 are larger than those in water [15] and reflect the T1107 aggregation induced by the oil and its incorporation into micelles in agreement with the DSC results. a,x-Dichloroalkanes in micelles of decyltrimethylammonium bromide (DeTAB) and sodium decanoate (NaDec) have the same volume as that of pure compounds [46], which in turn is larger than the value in water.…”

“…Based on this idea, we assumed the mass action model for the micellization (afore-mentioned) and a model for the oil distribution between the aqueous and the micellar phases, which was successfully applied to the thermodynamic properties of transfer of solutes from water to the aqueous surfactant solutions [15,42,43]. In particular, it was stated that 1 micelle interacts with w oil molecules to form a mixed micelle according to the following equilibrium…”

“…In our case, polypropylene oxide (PPO) was assumed to be the solvent. The values for the molar volume of the pure oils (V Ã o ) were taken from the literature [15]. The d o and v oP are collected in Table 3.…”

“…Solubilization, stabilization and delivery of hydrophobic drugs in aggregates of Pluronics were exploited [7][8][9]. Finally, the affinity of materials environmentally significant [10][11][12][13][14][15] to Pluronics micelles was investigated.…”