Low molecular weight aromatic compounds possessing a nonflammable characteristic in fluoroalkyl end‐capped acrylic acid oligomer/silica nanocomposite matrices after calcination at 800 °C under atmospheric conditions |
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| Authors: | Hideo Sawada Mieko Kikuchi Masakazu Nishida |
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| Affiliation: | 1. Department of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, Bunkyo‐cho, Hirosaki 036‐8561, Japan;2. National Institute of Advanced Industrial Science and Technology (AIST), 2266‐98 Shimoshidami, Moriyama‐ku, Nagoya 463‐8560, Japan |
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| Abstract: | Fluoroalkyl end‐capped acrylic acid oligomer [RF‐(ACA)n‐RF] reacted with tetraethoxysilane and silica nanoparticles in the presence of low molecular weight aromatic compounds [ Ar‐H ] such as cetylpyridinium chloride (CPC) and bisphenol AF under alkaline conditions to afford RF‐(ACA)n‐RF/SiO2 nanocomposites‐encapsulated Ar‐H in 47–94% isolated yields. These fluorinated silica nanocomposites‐encapsulated Ar‐H can exhibit no weight loss behavior corresponding to the contents of Ar‐H after calcination at 800 °C under atmospheric conditions, although fluoroalkyl end‐capped acrylic acid oligomer in the nanocomposites decomposed completely under similar conditions. UV‐vis spectra of well‐dispersed methanol solutions of RF‐(ACA)n‐RF/SiO2/CPC nanocomposites before calcination show that CPC can be encapsulated into fluorinated silica nanocomposites with encapsulated ratios: 23–43%. The fluorinated nanocomposites after calcination was found to exhibit a higher antibacterial activity related to the presence of CPC in the composites. Encapsulated bisphenol AF into RF‐(ACA)n‐RF/SiO2 nanocomposites before and after calcination at 800 °C can exhibit a good releasing ability toward methanol with released ratios: 48 and 26%, respectively. 1H MAS NMR, HPLC analysis, and LC‐MS spectra of RF‐(ACA)n‐RF/silica nanocomposites‐encapsulated bisphenol AF also showed the presence of bisphenol AF in the nanocomposites even after calcination at 800 °C under atmospheric conditions. These findings suggest that CPC and bisphenol AF can exhibit a nonflammable characteristic in the fluorinated silica nanocomposites. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011 |
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| Keywords: | core‐shell polymers fluorinated oligomer 1H MAS NMR LC‐MS low molecular weight aromatic compound nanocomposites nanoparticles oligomers nonflammability silica nanocomposite thermogravimetric analysis (TGA) |
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