| Popis: |
Tridimensional polymers are mutually incompatible and a solution is the formation of interpenetrating polymer networks (IPN’s). In order to obtain optically transparent plaques, the polyurethane (PU), polymethylmetacrylate (PMMA) and sílica (SiO2) were syntetized and we obtained the best conditions of reaction for each material. We sintetized the binary networks and the ternary ones with different percentage from sílica were obtained, incorporating to the system 10% in weight of sílica, carrying out a curing in situ in mass. The interest of this work lies in the association of an inorganic network (SiO2) to two organic networks PU and PMMA. In order to reduce the phase separation that occurs in the PU, PMMA and SiO2 system, coupling agents of organic/inorganic nature were introduced. Optically transparent plaques were obtained using trimethoxysilyl propyl methacrylate and isocyanatopropyl triethoxy silane. The materials were characterized by Fourier Transformed Infrared Spectroscopy, verifying the presence of representative functional groups in each of the samples. The purpose of incorporating these materials to a single network is the improvement of the mechanical, optical and thermal properties of the organic polymers. |
