Nanostructured Materials Based on Compatible Interpenetrating Polymer Networks (Polyurethane/Polystyrene)
Tatiana T. Akejseeva, Yuri S. Lipatov, Sergey I. Grishchuk, Natali V. Babkina and Natali V. Yarovaya
The formation of semi-interpenetrating polymer networks based on the cross-linked polyurethane and linear polystyrene has been studied under various kinetic conditions. It was found that in all cases the two-phase systems were formed. Introduction into the starting reaction system of various amounts of monomethacrylic ester of ethylene glycol and 10, 20 mass % oligo-urethane-dimethacrylate brings about the IPNs formation which are characterized by a single relaxation maximum whose position depends on the system composition. Combined investigation of the reaction kinetics and light scattering for the modified system has shown that during the reaction no phase separation proceeds up to full conversion. The investigation of the systems using differential scanning calorimetry and dynamic mechanical analysis methods allowed to establish the regularities of the changes in position and parameters of single relaxation maximum. The conclusion has been drawn that miscible IPNs are formed due to the grafting of PU chains onto PS macromolecules via the third component.