A STUDY OF THE SOLUBILITY OF SYSTEMS FORMED FROM NC AND SMALL MOLECULES BY INVERSE GAS CHROMATOGRAPHY ( IGS)

Inverse gas chromatographic theory combined with Flory-Huggins theory of pseudo-lattice model is used in the present work to study the solubility of solution systems composed of different nitrocellulose (NC) and small molecules. Both the thermodynamic apd dynamic properties are emphasized. Some parameters, such as specific retention volume, interaction parameter and mixing heat, which characterize solubility of the system,were measured and the solubility of different systems judged based on these paramters. The dynamics of NC solution is discussed from the results of 1GC and Calvet micro-calorimeter experiments. A basic model for the solution of NC in solvents having high solubility is thus given. The results provide a theoretical and experimental basis for the dynamics of concentrated pojymer solutions.