Abstract
Fluoroalkyl end-capped N-(1,1-dimethyl-3-oxobutyl)acrylamide oligomer [RF-(DOBAA)n-RF]/silica gel nanocomposite, which was prepared by reaction of the corresponding fluorinated oligomer with tetraethoxysilane and silica gel nanoparticles under alkaline conditions, exhibited no weight loss even at 800 °C equal to the original silica gel, although the corresponding parent RF-(DOBAA)n-RF oligomer was completely degraded at 600 °C. Thermogravimetric analyses/mass spectra of fluorinated nanocomposite showed that this nanocomposite decomposed around 280 °C to afford CO2 and H2O as the major evolved gaseous products including some minor fluoro- and hydrocarbons. X-ray photoelectron spectroscopy analyses also showed that the contents of C, F, and Si atoms in RF-(DOBAA)n-RF/SiO2 nanocomposite after the calcination at 800 °C were similar to those before the calcination. These findings suggest that the evolved gaseous products should be encapsulated quantitatively into nanometer-size-controlled silica matrices to give the fluorinated silica gel nanocomposite with no weight loss even at 800 °C equal to the original silica gel.
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Acknowledgement
We thank S. Nagasawa (Bruker AXS. K. K., Japan) for TG/Mass observation and Y. Yoshida (Kratos Analytical, Japan) for XPS observation. This work was partially supported by a grant-in-aid for Scientific Research from the Ministry of Education, Science, Sports and Culture, Japan.
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Sawada, H., Narumi, T., Kodama, S. et al. A fluoroalkyl end-capped N-(1,1-dimethyl-3-oxobutyl)acrylamide oligomer/silica gel nanocomposite with no weight loss even at 800 °C equal to an original silica gel. Colloid Polym Sci 285, 977–983 (2007). https://doi.org/10.1007/s00396-007-1641-9
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DOI: https://doi.org/10.1007/s00396-007-1641-9