聚醚型氨酯酰亚胺/二氧化硅杂化材料的合成与性能研究

利用Sol Gel共聚合反应制备出聚醚型氨酯酰亚胺 (PUI) /二氧化硅 (SiO2 )杂化材料 .利用NMR、FTIR、TG、DSC及SEM等测试手段对性能进行了基本表征 .FTIR研究结果发现在 10 0℃下能同时完成有机相PUI的亚胺化和无机相SiO2 凝胶网络的Sol Gel转变 .TG及SEM发现SiO2 含量为 9wt%时SiO2 聚集相粒径在 0 2～1 0 μm之间 ,耐热性明显提高并达到最佳 ;发现SiO2 含量的增加其颗粒粒径不断增大 ,并不断聚集成大粒径SiO2 相 ,有机和无机相分离明显 .DSC研究显示 ,SiO2 相的引入 ,对杂化材料聚醚软段富集相的Tg 不产生明显影响 .

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.