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標題: Organo-clay hybrids based on dendritic molecules: preparation and characterization
作者: Juang, T.Y.
Tsai, C.C.
Wu, T.M.
Dai, S.A.
Chen, C.P.
Lin, J.J.
Liu, Y.L.
Jeng, R.J.
關鍵字: layered silicate nanocomposites;double hydroxides;building-blocks;dendrimers;intercalation;montmorillonite;dendrons;behavior;macromolecules;nanoparticles
Project: Nanotechnology
期刊/報告no:: Nanotechnology, Volume 18, Issue 20.
Three generations of dendrons ( G1, G2 and G3) with phenyl end-groups were intercalated into montmorillonite ( MMT) layered silicates in dimethylformamide/water cosolvent. These dendrons synthesized via the convergent route were different in size and shape with molecular weights ranging from 930 to 5975 g mol(-1). X-ray diffraction ( XRD) and high resolution transmission electron microscopy ( HRTEM) indicate that the respective intercalations of MMT with G1, G2 and G3 dendrons exhibited organized characteristics, and the interlayer spacings were 38, 77 and 115 angstrom for G1/MMT, G2/MMT and G3/MMT, respectively. Furthermore, the modified dendron/ MMT hybrids could be well dispersed into organic solvents, such as DMF, due to the presence of hydrophobic dendritic molecules. Our results indicate that organic/inorganic hybrids resulting from the association of dendrons and inorganic layered silicate can be obtained not only by ionic exchange reaction, but possibly by a direct organized route as well. Moreover, the preparation of dendron/MMT hybrids was investigated at different dendron/MMT molar ratios regarding the changes of interlayer distance. When the molar ratio is within the range of 0.25-1.0 cationic exchange capacity ( CEC) equivalents, the d spacings increase from 19 to 38 angstrom for G1/MMT, 15 to 77 angstrom for G2/MMT and 14 to 115 angstrom for G3/MMT, revealing a conformation change of the intercalating dendrons.
ISSN: 0957-4484
DOI: 10.1088/0957-4484/18/20/205606
Appears in Collections:材料科學與工程學系

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