On the theory of polymer-containing disperse systems .4. Aggregation of dispersed particles interacting with macromoleculesстатья
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Дата последнего поиска статьи во внешних источниках: 12 октября 2013 г.
Местоположение издательства:Road Town, United Kingdom
Первая страница:596
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Аннотация:Aggregation of dispersed particles interacting with macromolecules was investigated by using the theory of integral equations. The analysis is based on the calculation of a special correlation function [the connectedness function h(+)(r)], which determines the probability of the fact that two particles are separated by a distance r and enters into the same physical cluster. It was shown that the aggregation of dispersed particles in a two-component athermal system occurs the more intensely the higher the polymer concentration. The effect of macromolecules on the particle aggregation decreases with an increase in chain length N-p; however, at rather large N-p similar to 10(3), an asymptotic regime is reached when parameter N-p does not play any role. During adsorption of polymer units on the particles, a decrease in temperature first tends to diminish the average dimensions of aggregates followed by an increase; a simple model explaining such nonmonotonic behavior was proposed. For the critical range of parameters (temperature and polymer density), conditions are formulated at which a macroscopic cluster is formed, i.e., particle condensation occurs that is mediated by the adsorption interaction with macromolecules.