On the theory of polymer-containing disperse systems .2. The interaction of macromolecules with small spherical particlesстатья
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Дата последнего поиска статьи во внешних источниках: 12 октября 2013 г.
Местоположение издательства:Road Town, United Kingdom
Первая страница:571
Последняя страница:584
Аннотация:A microscopic model was employed within the framework of the theory of integral RISM equations to describe the interactions between macromolecules and small spherical particles in polymer-containing colloidal systems. It was shown that the theoretical approach developed may adequately predict various equilibrium characteristics of individual components, The interactions of small spherical particles with flexible polymer chains were investigated at a weak adsorption of macromolecules on the particle surfaces and in the absence of adsorption interaction. It was established that the addition of polymers, even in small quantities, dramatically affects the spatial particle distribution. The main trend is that structurization of a dispersed component occurs with an increase in polymer content in a system: particles are replaced from regions occupied by the chains, thus increasing fluctuations in their spatial density. When adsorption is present, two specific temperatures, T-1(0) and T-2(0), corresponding to the isopoint where the effective interaction between particles is the same as in ideal gas of particles, appear. In the interval between T-1(0) and T-2(0), there is the domain of parameters where the compressibility of a dispersed component is lower than for a system composed of individual particles, In this domain, conditions are implemented when polymer additives improve the aggregation stability, i.e., the polymer acts as a stabilizer of dispersion.