The Effect of Polymer Concentration on the Dynamics of Adsorbed Poly(N-isopropylacrylamide) at Particle Surfaces in Water.
Results are presented of a light scattering study of the dynamics of absorbed poly(N-isopropylacrylamide) (PNIPAM) chains at the surfaces of poly(N-tert-butylacrylamide) (PNTBA) latex particles using several different feed weight ratios of PNIPAM to latex particles. The adsorbed layer dynamics under the present experimental conditions were postulated to include both the extended-to-loopily adsorbed state transition of tightly adsorbed chains and the diffusion of tenuously adsorbed chains. The dynamics were described by a nonexponential rate process. The relaxation times calculated were found to increase with increasing polymer to latex feed weight ratio. Kinetic constraints were inferred to play a crucial role in controlling the overall dynamics. A higher polymer to latex feed weight ratio was considered to enhance these kinetic constraints. Copyright 1999 Academic Press.
Zhu
PW
School of Chemistry, The University of Sydney, Sydney, New South Wales, 2006, Australia
Napper
DH