The Effect of Polymer Concentration on the Dynamics of Adsorbed Poly(N-isopropylacrylamide) at Particle Surfaces in Water

Author： Zhu P.W.   Napper D.H.  

Publisher： Academic Press

ISSN： 0021-9797

Source： Journal of Colloid and Interface Science, Vol.214, Iss.2, 1999-06, pp. : 389-394

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Abstract

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.

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