Surface Grafting of Silica Nanoparticle Using Supercritical Carbon Dioxide
Date Issued
2008
Date
2008
Author(s)
Chen, Shu-Yu
Abstract
In this study, SiO2 nanoparticles were successfully modified with 3- Glycidoxypropyltrimethoxysilane using supercritical carbon dioxide (SCCO2) as a solvent. By this way, we can change temperature、presure and reaction time to control degree of grafting without organic solvent. When temperature is 1000C, operating pressure is 30MPa and reaction time is 8 h, grafting percentage have maximax: 4.66 wt.%. Modified SiO2 were characterized by Fourier transform infrared spectroscopy (FTIR) and Thermogravimetric (TGA). Further, SiO2/Poly(amic acid) mixture and SiO2/Poly(3,4’-Oxydiphenylene Pyromellitimide) composites were prepared. They were characterized by UV-vis and SEM. Modified SiO2 in organic substance observed good dispersibility compare to bare of that. Poly(3,4’-Oxydiphenylene Pyromellitimide) differs from the more common PMDA-4,4’-ODA only in the isomerization of the diamine unit. It was synthesized sunce 1991, there’s not nanocomposites about Poly(3,4’-Oxydiphenylene Pyromellitimide). Our study be a reference for PMDA-3,4’-ODA nanocomposites in the future.
Subjects
3-Glycidoxypropyltrimethoxysilane
nanocomposites
supercritical carbon dioxide
polyimide
Thermal expansion coefficient
Type
thesis
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