Abstract
The viscoelastic properties have been measured by means of a cone–plate-type rheometer for aqueous disperse systems of ionic microgels. Marked viscoelastic enhancement was observed in some aggregate systems in which anionic and cationic particles were mixed. The dynamic viscoelastic functions of these aggregate systems were enhanced ca. 105 times with respect to those of non-aggregate systems, suggesting that the aggregate contains a large quantity of bound water which is tightly arranged in the electrostatic potential field between oppositely charged particles. The bound water was investigated by d.s.c., dielectric measurements and n.m.r. spectroscopy. Two kinds of bound water were detected by d.s.c. and dielectric measurements. The dielectric relaxation time of the bound water which seems to take part in the viscoelastic enhancement was ca. 8.9 × 10–9 s.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
