Study Of Mesoporous Material SBA-15/Epoxy Nanocomposite And Cure Kinetics

Epoxy networks are among the commercially successful thermosetting materials, especially as adhesives, coatings, encapsulation of electronic components and of composite materials,etc. the extensive applications of epoxy networks motivate intense studies having the objectives to prepare organic-inorganic nanocomposites with novel and improved performances. The properties of the nanocomposites are expected to arise from a synergistic combination of individual organic/inorganic component properties when these components are mixed intimately at the nanometer scale. A novel epoxy resin/SBA-15 nanocomposite modified by coupling agent was prepared by solution blending. The influences of amount of coupling agent and the medium modification on the disperse properties and mechanical properties were investigated. The results showed that the novel nanonetwork composite with the monodisperse,nanosized mosoporous SBA-15 particle strengthed is prepared at the suitable amount of coupling agent and the suitable medium. The main research contents are as follow:SBA-15 and AMS of well-ordered mesoporous silica materials were synthesized by using the nonionic triblock copolymers P123 and F127 as templates via the sol-gel process. And we modified mesoporous materials by silane couling agent. The results of SEM,XRD,Surface area,TGA and FT-IR indicated that the organic amino group was successful tethered to SBA-15 while the hexagonal structural character was mostly retained.In this thesis, epoxy curing reaction was studied by DSC and Rheometer. The results show that SBA-15 catalyzed epoxy cure which contained two side of effects, one effect was major catalysis by hydroxyl group and another was second catalysis by the structure of SBA-15. The amino-functionalized SBA-15 was good in both epoxy react rate and epoxy curing degree and the reaction followed the auto-catalyzed model.In this thesis, the rheology of epoxy/nano-silica and epoxy/SBA-15 systems suspensions as well as morphology and dynamic mechanical properties of the corresponding nanocomposites were studied. The results show that except for low amount of filler, a shear thinning behavior was observed in the others nano-silica and SBA-15 based epoxy suspensions. The interactions developed between the filler and the epoxy matrix are responsible for magnitude of the shear thinning effect and are related to morphology of the nanocomposites. The best dipersion of SBA-15 was achieved using either an emulsion process or a glycidyl functionalized SBA-15.