SYNTHESIS AND PROPERTIES OF TEMPERATURE-S ENSITIVE HYDROGEL MEMBRANES

Mathematical modeling of network structures on a body-centered lattice was performed; it was demonstrated that their free volume is signific antly controlled by the distance between the network junctions, wherea s the effect of chain flexibility is less pronounced. Experimental inv estigation of the effect of the concen- tration of cross-linking agent and temperature on the structural parameters of diethyl acrylamide co polymers; cross-linked with N,N'-methylenebisacrylamide revealed that increasing the temperature from 20 degrees C (this temperature is belo w the LCST of the copolymer) to 40 degrees C (i.e., above the LCST cau ses a significant (by 5-20 times) variation of equilibrium swelling an d the volume of system; the decrease in (M) over bar(c) is smaller (by 1.2-2 times) and coincides with the calculated data. Permeability of hydrogel films to various compounds was also measured.