chapter  4
24 Pages

CONFORMATION OF LINEAR POLYMERIC CHAINS AT THE INTERFACE LAYER LIQUID / SOLID AND ADSORPTION ISOTHERM

Summary ................................................................................................. 78 4.1 Introduction .................................................................................... 78 4.2 Conformation and Free Energy of Conformation of the Linear

Polymeric Chains in Adsorptive Layer .......................................... 81 4.3 Adsorption Isotherm of the Polymeric Chains .............................. 89 4.4 Conclusions .................................................................................... 95 Keywords ................................................................................................ 98 References ............................................................................................... 98

SUMMARY

A conception about volumetric form of the adsorption of polymeric chains has been used accordingly to which their “anchor” fit on the surface of the adsorbent is realized by a little number of the end links forming the Langmuir connection with the active centers of the adsorbent. On a basis of the self-avoiding random walks statistics developed earlier for the solutions, the expressions for the conformational radiuses and for the free energies of polymeric chains in adsorptive diluted and concentrated layers were obtained. Free energy of the conformation included in the determination of the chemical potential of the polymeric chain in solution and adsorption layer. On its basis it was obtained a general expression for the adsorption isotherm, which contains a change of the free conformation energy under transition of a chain from the solution into the adsorptive layer. The partial variants of the general adsorption isotherm were analyzed and it was shown that they give a true description of typical experimentally observed adsorption isotherms.