Thermosensitive water-polymer systems studied by luminescent spectroscopy.Copolymers of N-vinylcaprolactam and N-vinylpyrrolidone

Thermosensitive aqueous solutions of N-vinylcaprolactam/N-vinylpyrrolidone (co)polymers were investigated by luminescent spectroscopy. Investigation o f the luminescent intensity and the bound fraction of luminescence indicato rs interacting to the (co)polymers in water showed that the chemical struct ure of the water-soluble poly-N-vinylamides defines their functional and st ructural characteristics such as conformation, intramolecular mobility, com pactization and complexation. It was established that the complexing abilit y of VCL-VP copolymers exceeds that of PVP even at a low content of VCL uni ts. At 85 mol% of VCL the complexation and compactization of the macromolec ules were found to be higher than that of pure PVCL. A hinge-like action of VP units incorporated in PVCL structure is suggested to be a reason of the extreme behavior observed for 85:15 VCL:VP composition.