Poly-N-vinylcaprolactamdashhydrate complex as a model of detector of associate states and interactions in aqueous solutions

✍ Scribed by Yu.E. Kirsh; N.A. Yanul; K.K Kalninsh; V.G. Maslov

• Book ID: 104304012
• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 778 KB
• Volume: 82
• Category: Article
• ISSN: 0167-7322
• DOI: 10.1016/s0167-7322(99)00046-x

✦ Synopsis

The "dissolving precipitation" transition of poly-N-vinylcaprolaetam (PVCL) maeromolecules in water at heating was studied. The structure of the PVCL-water complex was determined by ab initio quantum-chemical analysis and DSC method. It was found that the latent heat of transition is low (-1.7 kJ/mol). This permits one to use hydrated PVCL macromoleeules as highly sensitive detectors of water associates and interactions occurring in a water medium. The influence of different water-soluble compounds on phase transition indirectly reflects a structure change in water caused by the latter. Various changes of the "dissolving-precipitation" transition temperature depending on the concentrations of various substances in water seem to indicate that each compound affects in its own way the water molecular structure in solution.