Studying the Swelling and Thermodynamic Functions of a Graft Co - polymer Using Different Molar Ratios of Acrylic Acid Monomer

In this work, the of graft co-polymer was prepared, by using glycerol as material containing the three alcoholic groups, and that reacted with terphthalic acid which have two carboxylic group as a first step, and then added 0.5 mole of fumaric acid to prepared graft co-polymer, as a second step. The acrylic acid monomer was added to the graft co-polymer in different number of moles (1.5, 2.0 & 2.5 mole). The swelling ratio measurements of the graft co-polymer, in three different buffer solution (2.2, 7.0 and 8.0), in the constant temperature at 310 K. The results showed that the increases of number of the moles of the acrylic acid monomer, Leads to increased of swelling ratio. Thermodynamic functions were calculated of the linear polymer.