Kinetics of Shear Induced Micellar Association

Autor: S N Liu, L. E. Dewalt, M. W. Kim, P. K. Dixon, David J. Pine, Dennis G. Peiffer, H. D. Ou-Yang
Rok vydání: 1991
Předmět:
Zdroj: MRS Proceedings. 248
ISSN: 1946-4274
0272-9172
DOI: 10.1557/proc-248-203
Popis: Rheological measurements have been used to study the kinetics of shear induced association for rod-shape micelles formed by mixtures of ADHAB and salicylic-sodium salt. Pronounced hysteresis and large fluctuations were found in the stress-shear rate diagram. We investigate the association and dissociation mechanism through stress quench experiments where viscosity measurements study the system relaxation. The association process was found to be a single exponential with a relaxation time of about 1 minute, whereas the dissociation process was much slower and was non-exponential. In the semidilute regime, the critical shear rates increase with concentration, contradictory with existing theories.
Databáze: OpenAIRE
Externí odkaz: