Preparation of PMMA/SiO_2 hybrids by sol-gel
To resolve the problem of phase separation in PMMA/SiO_2 hybrids system,different polymethyl methacrylate(PMMA)/SiO_2 hybrids were prepared by synchronous sol-gel process.There is a covalent bond between PMMA and SiO_2.The samples were characterized by transmission electron microscopy(TEM),X-ray diffraction(XRD),Fourier transformed infrared spectrum(FTIR) and thermal gravity(TG).The results show that when the silica content is between 20%~60%,there is no phase separation in the PMMA/SiO_2 hybrid system.and the transparency of PMMA/SiO_2 hybrid material is good when the silica content is between 20%~40%.