Morphological study of modified PU/PMMA semi-IPNs and nanocomposites with BaTiO₃

Acrylate modified PU was prepared as one network and then selected to penetrate with PMMA to form room cured semi-IPNs with nanometer dispersed phase. The IPNs were composed with BaTiO₃ nanometer powders to obtain novel nanocomposites. IR spectroscopy was used to trace the polymerization process and to determine the simultaneous interpenetrating techniques. Through the technique, the phase-separation in systems can be controlled effectively. TMA and TEM tests both indicated that large amount of interpenetration and entanglement structures formed could link-up Tgs effectively. TEM results also show that the crosslinking structures may improve the miscibility of systems a lot. So the domains between two phases and composite systems were both within nanometer ranges.