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STUDY ON THE SYNTHESIS AND PROPERTIES OF POLYETHER-URETHANE -IMIDE/SILICA HYBRID MATERIALS

A series of polyether-urethane-imide (PUI) /silica(SiO 2) hybrid composite materials with different silica content were successfully prepared by the Sol-Gel process.The properties of in-situ synthesized PUI/SiO 2 hybrid materials were characterized by NMR,FTIR,SEM,DSC and TG measurements.The FTIR analysis revealed that the reaction of imidization of PUI in the organic phase and the reaction of SiO 2 sol-gel transformation in the inorganic phase are simultaneously completed in this system at 100℃ .The TG and the SEM results indicated that PUI/SiO 2 composite materials with appropriate silica contents (approximately 9 wt%) possessed outstanding thermal stability,in these cases silica particles with diameters around 0.2～1.0 μm were observed.The result showed that with increasing silica content the silica particles grew larger,resulting in obvious separation of the organic and inorganic phases .The DSC results suggest that T g of the soft segment rich phase of PUI/SiO 2 hybrid materials is not influenced obviously by introducing SiO 2 to PUI systems.