Determination and Correlation of Solubility of N-tert-Butylacrylamide in Seven Different Solvents at Temperatures between (279.15 and 353.15) K

Abstract

The solubility data of N-tert-butylacrylamide (TBA) in the ethyl acetate, ethanol,dichloromethane, water, formamide, N,N-dimethylformamide (DMF), and N,N-dimethylacetamide (DMAC) at temperatures ranging from (279.15 to 353.15) K were measured by synthetic method. The experimental data were correlated by the van't Hoff plot, modified Apelblat equation, and two local composition models (NRTL and UNIQUAC), respectively. It was found that modified Apelblat equation could obtain the better correlation results than the other three models. In addition, the standard enthalpy, standard entropy and Gibbs free energy change for the solution process were calculated from the solubility data by the van't Hoff analysis. Furthermore, on the basis of the NRTL model and experimental data, the thermodynamic excess functions (G E ,S E ,H E ) of TBA + solvents (ethyl acetate, ethanol, dichloromethane, water, formamide, DMF, DMAC) systems were determined.

Measurement and Correlation of the Solubility for Camptothecine in Different Organic Solvents

“…The solubility temperature dependence of camptothecine can be described by the ideal eq , where a and b are the ideal solution model parameters; x 1 is the mole fraction of the solubility at the absolute temperature T . The relative deviation (RD), the corresponding average absolute deviation (AAD), and the root-mean-square deviations (RMSD) were calculated by the following: The correlation value of a and b , coupled with R 2 , AAD, and RMSD, are listed in Table .…”

Solubility of Ethyl p-Aminobenzoate in Six Alcohols within (283.15 to 327.15) K

“…For nonideal solution, the thermodynamic function in a mixing process can be obtained by using the following expression 21,34,35…”

“…For nonideal solution, the thermodynamic function in a mixing process can be obtained by using the following expression ,, Here, The values of γ 1 and γ 2 were calculated from NRTL model.…”

“…The determination of solubility of the solute in the solvent is generally achieved by the gravimetric or dynamic method. − In this study, the last solid disappearance method, as a member of dynamic methods, was applied to measure the solubility of EPAB in six pure alcohols. The detailed apparatus and procedure to measure the solubility of EPAB in our laboratory were described in our previous reported literatures. − A belief summary was presented as follows: A known mass of solvent (about 40g ± 0.001g) was added into a three-necked flask that is equipped with a stirrer, a condenser, and mercury thermometer (standard uncertainty of 0.05 K). The temperature in the experiment remained stable in the control of a cylindrical glass thermostatic water bath.…”

In situ synthesis of magnetic poly(N-tert-butyl acrylamide-co-acrylic acid)/Fe3O4 nanogels for magnetic resonance imaging

“…22 N-tert-Butylacrylamide (TBA) is an important material to synthesize copolymer nanogels, which can enhance the rigidity of molecular chain and then decrease the phase transition temperature and salt resistance. 23,24 TBA-based nanogels have good biocompatibility and their mean size is smaller than other isonomic nanogels under the same reactive situation for hydrophobicity of TBA, thus they are more suitable as an intravenous injection for living body. Therefore, we described a novel magnetic nanogels preparation technology.…”