Controlling the shear-induced structural transition of rodlike micelles using nonionic polymer

Citation
Mt. Truong et Lm. Walker, Controlling the shear-induced structural transition of rodlike micelles using nonionic polymer, LANGMUIR, 16(21), 2000, pp. 7991-7998
Citations number
37
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
LANGMUIR
ISSN journal
07437463 → ACNP
Volume
16
Issue
21
Year of publication
2000
Pages
7991 - 7998
Database
ISI
SICI code
0743-7463(20001017)16:21<7991:CTSSTO>2.0.ZU;2-I
Abstract
We demonstrate that nonionic polymer can be used to control the shear-induc ed transition observed in the cationic rodlike micellar system of cetyltrim ethylammonium p-toluene sulfonate (CTAT). Hydroxypropyl cellulose (HPC) sup presses this transition, while poly(ethylene oxide) (PEO) enhances the zero -shear viscosity, with little change to the critical rates of the transitio n. It is proposed that the availability of hydrophobic moieties of HPC allo ws for its influence on the onset of the transition. This is consistent wit h binding, rheological, and small-angle neutron scattering (SANS) studies. Furthermore, quiescent SANS shows that both polymers affect intermicellar i nteractions, solvent-micelle interactions, and/or micellar length. While th e onset of the shear-induced transition may be altered with polymer, polyme r composition does not affect micellar flexibility and/or interactions in t he aligned transitioned state.