Preparation Of Polymer With Bicontinuous Phase Morphologis And Its Morphology Control

Strain-induced plastic-to-rubber transition of SBS block copolymers have been reported previously in the literature. Using the mechanism, it may be prepared the novel material with self-healing effect. In this thesis, preparation and phase separation of segment polyurethane (PU) and development of bicontinuous morphologies of polysulfone (PSF) modified epoxy system were studied. First of all, a novel flexible-rigid segment polyurethane with bicontinuous phase morphologies was prepared through two-step solution polymerization method. The obtained results indicated that the segment polyurethane was successfully prepared. Compared with the microphase-separated states of hard segment based on BDO and EG of polyurethane, the former is easy to form hydrogen-bonding, which is favored to phase separation. Atomic force microscopy (AFM) and Transmission Electron Microscopy (TEM) were used to measure the morphology of microphase-separated states of polyurethane, and the good result of microphase separation of PU was found. The morphology of PU is of great importance in preparing desired self-healing PU and further work including mechanical properties measurement of PU is underway in our laboratory.The self-healing effect and development of bicontinuous morphologies in a blend of a commercial polysulfone (PSF) accounting to 10 wt % with epoxy resin, also were studied. The development of bicontinuous morphologies and its self-healing effect were analyzed by inverted phase contrast microscope,scanning electron microscopy( SEM) and Energy Disperse Spectroscopy (EDS). The results of inverted phase contrast microscope indicated that the polysulfone-modified epoxies with short reaction time had relative higher elongation, resilience and stress relaxation and the self-healing effect of postcure sample were also desirable.