Thermodynamic study of poly(vinyl alcohol) solutions by viscometry

When high molecular weight nonionic polymer molecules dissolve in a fluid, they typically expand to form spherical coils. A polymer coil’s hydrodynamic volume depends upon the polymer molecular weight and its thermodynamic interaction with the solvent. Favorable polymer–solvent interactions also increase the hydrodynamic volume of the polymer coil. When the polymer–solvent interactions are unfavorable, the polymer coil volume is decreased. With unfavorable polymer–solvent interactions, polymer coils can completely collapse and become insoluble in the fluid. Polymer–solvent interactions depend upon the polymer molecular structure, chemical composition, solution concentration, solvent molecular structure, and the solution temperature [۲,۳].

کلیدواژه ها:

polymer solution ، poly(vinyl alcohol) ، intrinsic viscosity ، expansion factor