Thermal characterization of polymeric anion exchangers with a dendrimeric structure

The thermal properties of new anion exchangers prepared via the grafting process to polymeric particles having hydroxyl groups on their surface were evaluated by thermogravimetry and differential scanning calorimetry. The support microspheres were copolymers of 1,4-di(2-hydroxy-3-methacryloyloxypropoxy)benzene (1,4 DMH) and trimethylolpropane trimethacrylate (TRIM). They were coated with polymeric layers formed by condensation polymerization of primary amines with diepoxides. Synthesized copolymers of methylamine and 1,4-butanedioldiglycidyl ether have a dendrimer structure. By TG/FTIR/MS, it was observed that new dendrimeric materials exhibited one stage of mass loss with T (max1) 400 A degrees C, connected with degradation of organic layers. DSC and TG experiments showed that water molecules are absorbed on the materials surface. The synthesized anion exchangers exhibited good thermal stability, suitable for their use in chromatographic experiments carried out with higher temperatures.