The present paper reports the results of compressibility and incoherent quasi-elastic neutron scattering measurements performed on polymeric systems and on their aqueous solutions. From the compressibility data, the temperature evolution of the polymer hydration number can be derived. On the other hand, neutron data show that the translational diffusion coefficient D-T turns out to be higher in the case of ethylene glycol + water, with respect to that of pure, suggesting that the water molecules act as a structure breaker,, of the intermolecular connectivity existing into the pure. Furthermore the dynamical properties of the H2O molecules in the presence of poly(ethylene glycol) deeply differ from those in the bulk, and show that we are in the presence of entangled water.
NEUTRON-SCATTERING AND COMPRESSIBILITY MEASUREMENTS FOR THE STUDY OF HYDRATION EFFECTS ON POLYMERIC AQUEOUS-SOLUTIONS
VASI;
1994
Abstract
The present paper reports the results of compressibility and incoherent quasi-elastic neutron scattering measurements performed on polymeric systems and on their aqueous solutions. From the compressibility data, the temperature evolution of the polymer hydration number can be derived. On the other hand, neutron data show that the translational diffusion coefficient D-T turns out to be higher in the case of ethylene glycol + water, with respect to that of pure, suggesting that the water molecules act as a structure breaker,, of the intermolecular connectivity existing into the pure. Furthermore the dynamical properties of the H2O molecules in the presence of poly(ethylene glycol) deeply differ from those in the bulk, and show that we are in the presence of entangled water.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
