Abstract
The kinetics of adsorption of poly(dimethylsiloxane) chains on silica particles is observed from end-methylated chains at room temperature and several silica concentrations and from hydroxyl-terminated chains at several temperatures. The kinetics is interpreted as a progressive surface saturation process. The time constant of adsorption of methylated chains was found to be τ = 144, 52 and 39 h for silica concentrations equal to 0.09, 0.17 and 0.29 (w/w), respectively. For hydroxylated chains, τ was found to be equal to 124, 30 and 2 h at 323, 353 and 373 K, respectively. The activation energy of the process is 18 kcal mol −1.
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