Simultaneous sorption of two additives by polyethylene: Part I. Mutual substitution

Physical chemistry of topological disorder in polymers: Some remarks on polymer memory

“…It was shown in refs. 5 and6 that this second term at various assumptions of [Z i ] distribution may be approximated with a Langmuir‐type formula: where K a is the average constant of sorption equilibrium and Z a is the total concentration of centers sorbing the compound A. Also, if it is assumed that the concentration of truly dissolved A in the polymer is directly proportional to that in the surrounding medium ([A] m ) we get a formula similar to eq.…”

“…Some experiments were performed on the sorption of additives with polyethylene and isotactic polypropylene from solutions of these additives in various solvents. In some studies, the substitution of one additive with another, that is, the following process, was observed:6 In some experiments, instead of sorption isotherms, the limiting additive concentration, corresponding to the additive solubility ([A] s = γ as [A] m ) was measured. Similarly, the solvent molecules (S's) could substitute for the additive in the sorption centers: In the absence of additive, the molecules of solvent, including water, penetrated into the sorption centers.…”