The molecular weights of fluoroalkyl end-capped oligomers are in general within 10,000, and their thermal stability is extremely poor compared with that of traditional perfluorinated polymers.1) Thus, from the developmental viewpoints of new fluorinated heat resistant materials, it is in particular interest to develop fluoroalkyl end-capped oligomers/inorganic nanocomposites.2) In fact, we have already reported that fluoroalkyl end-capped N-(1,1-dimethyl-3-oxobutylacrylamide) oligomer [RF-(DOBAA)n-RF]/silica nanocomposites, which were prepared by the sol-gel reactions of the corresponding oligomer with tetraethoxysilane and silica nanoparticles under alkaline conditions, can give no weight loss behavior corresponding to the content of fluorinated oligomer in the silica nanocomposite matrices at all even after calcination at 800 oC.3) Here, we report that not only silica nanoparticles but also boric acid can be applicable to new fluoroalkyl end-capped oligomeric nanocomposites.     RF-(DOBAA)n-RF oligomer reacted with boric acid to afford the corresponding oligomer/boric acid nanocomposites. Interestingly, these obtained nanocomposites were found to increase extremely the absorption peaks and fluorescent intensities related to the oligomers in the composites. Additionally, we have succeeded in preparing a variety of fluoroalkyl end-capped oligomers/boric acid/silica nanocomposites by the reactions of the corresponding fluorinated oligomers with boric acid and silica nanoparticles under no catalytic or alkaline conditions.  Interestingly, it was demonstrated that these fluorinated oligomers/boric acid/silica nanocomposites can exhibit no weight loss behavior even after calcination at 800 oC, although some of the corresponding fluorinated oligomers/silica nanocomposites give a usual weight loss under similar conditions.1) Sawada, H.; Kikuchi, M.; Nishida, M. J. Polym. Sci. Part A: Polym. Chem. 2011, 49 , 1070.2) a) Sawada, H. Chem. Rev. 1996, 96 , 1779;b) Sawada, H. Prog. Polym. Sci. 2007, 32 , 509;c) Sawada, H. Polym. J. 2007, 39 , 637.d) Sawada, H. Polym. Chem. 2012, 3 , 46.3) Sawada, H.; Narumi T. et al., Colloid Polym. Sci. 2007, 285 , 977.

Preparation and properties of fluoroalkyl end-capped oligomers/boric acid nanocomposites

246th National Meeting (2013)

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