Macromolecules with amphiphilic monomer units at interface of two immiscible liquids
AA Glagoleva and VV Vasilevskaya, JOURNAL OF CHEMICAL PHYSICS, 147, 184902 (2017).
The adsorption of macromolecules with amphiphilic monomer units at the liquid-liquid interface was studied. The amphiphilic structure of monomer units with groups selectively interacting with alpha and beta liquids was described by the A-graft-B dumbbell model. The calculations were performed for the symmetrical interaction of A and B groups with liquids, different selectivity parameters xi and degree of polymerization N. The simulations indicate a three-step adsorption scenario, including non-adsorbed, weak and strong localization states. It was shown that the adsorption of (A-graft-B)(N) macromolecules obeys scaling laws developed to describe the adsorption of the alternating (AB)(N) copolymer at the liquid-liquid interface with critical selectivity parameter xi(c) of transition into the weak localization state depending on the degree of polymerization as N-1/5; critical selectivity parameter xi(infinity) of transition to the strong localization regime non-depending on the degree of polymerization; and relative change of perpendicular R-z radius of gyration varying as a power function of xi N-1/5: R-z(xi)/R-z(0) similar to (xi N-1/5)(rho) and rho = -2 nu/(1 - v). Meanwhile, (A-graft-B)(N) macromolecules have much lower xi(c) and xi(infinity) values and thus are more prospective for practical applications. Published by AIP Publishing.
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