| 초록 |
Efficient catalyst for low temperature imidization was adapted to Soluble PI, which was prepared by reacting ODA, 6FDA and characterized. C-20A was used by solution blending method for improving PI’s properties. The rate of imidization of polyamicacid in low temperature was examined by FTIR. Different loading levels of C-20A improved PI’s thermal and mechanical properties while the water absorption capacity has been reduced. The structures of PI/C-20A nanohybrids were confirmed by FTIR while X-ray diffraction and TEM showed the intercalation of PU into layer silicates. The thermal properties of PI and PI/C-20A nanohybrids were investigated byTGA and DSC. Thus the formations of nanohybrids manifests through the enhancement of thermal, mechanical and anti-water absorption properties as compared with neat PI due to the nanometer-sized dispersion of layered silicate. |
