Characterization of thermo-reversible gels by means of sedimentation equilibria

摘要: This paper describes the deformation of gels in a centrifugal field leading to continuous equilibrium. A gel is considered be binary mixture cross-linked polymer and solvent assumed remain isotropic during deformation. From equation for osmotically effective pressure, called swelling thermodynamic properties can calculated. For highly swollen expression Svedberg Pedersen obtained. It shown that complete concentration dependence pressure range maximally up at cell bottom measured single equilibrium experiment. The homogeneity weakly examined by means method described. Soluble parts which are not incorporated into network also detected if they present. pressure-concentration curves it possible derive physically crosslinked gelatin/water were investigated. These described slightly modified Flory-Huggins with an interaction parameter χw weight fraction scale, depends linearly on concentration. parameters show explained increased branching crosslinking increasing initial gels. At low concentration, primary chains have aggregate build relatively long between junctions. static shear modulus G calculated from term has same order magnitude as real part complex frequency.