| Popis: |
New organic-inorganic hybrid materials and their anti-electrostatic hybrid membranes are prepared via sol-gel process. The polycondensation of epoxy oligomers and AEAPS/Al2O3 complexes which are organically surface modified submicrometer aluminum trihydroxide inorganic fillers with an active amino-terminal silane coupling agent, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane (AEAPS), are performed. AEAPS enhances the interfacial interactions between the inorganic fillers and epoxy polymers. Meanwhile, this coupling agent maintains well dispersion of fillers in these composites. To improve the mechanical strength and thermal stability, pyromellitic dianhydride (PMDA) is used as curing agent. These hybrid films prepared from this method have excellent physical properties, such as UV-shielding, high transmission in visible resign (> 85%), high hardness (7 similar to 8H), high adhesive force (7 similar to 8) and low relative surface resistance (9.71 x 10(11)similar to 1.26 x 10(10) Omega/cm(2)) with anti-electrostatic characters. For thermal resistance, the best Td value of epoxy/PMDA/AEAPS/Al2O3 is 378.6 degrees C which is 85.4 degrees C higher than that of neat epoxy resin. Physical properties of these materials are almost the same as those of the nanocomposites prepared from expensive colloid Al2O3. Evidences from TEM micrograph show that the inorganic additives are dispersed evenly in organic matrix with nanometer scale. |
