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
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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.
KeywordsFluorinated oligomer Silica gel Nanocomposite No weight loss TG/Mass XPS
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.
- 3.Laine RM, Sanchez C, Brinker CJ, Giannelis E (1998) Organic–inorganic hybrid materials. Materials Research Society, Warrendale, PA, USAGoogle Scholar
- 4.Brinker CJ, Scherer GW (1990) Sol–gel science. Academic, BostonGoogle Scholar
- 5.Misra M, Guest A, Tilley M (1998) Surf Coat Int 81:594–595Google Scholar
- 6.Hua Z, Qiu K-Y (1997) Polymer 31:521–526Google Scholar
- 8.Matejka L, Plestil J (1997) Macromol Symp 122:191–196Google Scholar
- 20.Sawada H, Kawase T (2001) Kobunshi Ronbunshu 58:147–160Google Scholar
- 21.Sawada H, Kawase T (2001) Kobunshi Ronbunshu 58:255–266Google Scholar
- 24.Cho J-W, Sul K-I (2001) Fiber Polym 2:135–140Google Scholar
- 25.Yano S, Okubo N, Takahashi K (1996) Macromol Symp 108:270–289Google Scholar
- 28.Gregg SJ, Sing KS, Sing W (1982) Adsorption, surface areas and porosity, 2nd edn. Academic, New YorkGoogle Scholar