INVESTIGADORES
AVENA marcelo Javier
artículos
Título:
Weak polyacid brushes: Preparation by LB deposition and optically detected titrations
Autor/es:
E.P.K. CURRIE; A.B. SIEVAL; M. AVENA; H. ZUILHOF; E.J.R. SUDHOLTER; M. A. COHEN STUART
Revista:
LANGMUIR
Editorial:
AMER CHEMICAL SOC
Referencias:
Lugar: Washington; Año: 1999 vol. 15 p. 7116 - 7118
ISSN:
0743-7463
Resumen:
We present a new technique for preparing and characterizing brushes consisting of weak acidic monomers. The brushes consist of polystyrene - polyacrylic acid block copolymers. The block copolymers are deposited from the air/water interface on a hydrophobically modified Si wafer via the Langmuir - Blodgett technique. The titration of such brushes at low ionic strength is measured with reflectometry. It is shown that thetitration curve of the grafted PAA is shifted toward higher pH with increasing grafting density, as predicted by theoretical models for weak acidic brushes.