Preparation and applications of novel fluoroalkyl end-capped oligomers/calcium carbonate nanocomposites |
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Authors: | Hideo Sawada Yasufumi Shikauchi Hiroshi Kakehi Yoshihiro Katoh Masashi Miura |
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Institution: | (1) Department of Frontier Materials Chemistry, Faculty of Science and Technology, Hirosaki University, Bunkyo-cho, Hirosaki 036-8561, Japan;(2) R & D Center, INAX Corporation, Tokoname, Aichi 479-8588, Japan |
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Abstract: | Calcium chloride reacted with sodium carbonate in the presence of a variety of self-assembled molecular aggregates formed
by fluoroalkyl end-capped acrylic acid, 2-methacryloyloxyethane sulfonic acid, dimethylacrylamide, and acryloylmorpholine
oligomers in aqueous solutions to afford the corresponding fluorinated oligomers/calcium carbonate composites in excellent
to moderate isolated yields. These fluorinated calcium carbonate composites thus obtained were shown to have a good dispersibility
not only in water but also in traditional organic media including fluorinated solvents. Dynamic light scattering measurements
(DLS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) showed that these fluorinated composites
are nanometer-size-controlled particles and well dispersed in these media. Cross-linked fluoroalkyl end-capped acrylic acid
co-oligomer containing poly(oxyethylene) units was also applied to the preparation of new cross-linked fluorinated calcium
carbonate nanocomposites under similar conditions. The obtained cross-linked fluorinated calcium carbonate nanocomposites
were found to have an extremely higher dispersibility in aqueous and organic media including fluorinated solvents, compared
to that of the corresponding fluoroalkyl end-capped oligomer nanocomposites. In particular, it was verified that these fluorinated
calcium carbonate nanocomposites are applicable to the dispersion above poly(methyl methacrylate) (PMMA) film surface. Interestingly,
field-emission SEM (FE-SEM) images of the cross-section of the modified PMMA films showed that calcium carbonate particles
dispersed into these PMMA films could be arranged regularly above the modified film surface. More interestingly, cross-linked
fluorinated oligomeric aggregates were able to provide suitable host moieties for the crystallization of calcium carbonate. |
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Keywords: | Calcium carbonate Nanocomposites Fluorinated oligomer Cross-linked aggregate Dispersion Molecular aggregate Surface modification |
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