Interlamellar esterification of H-magadiite with aliphatic alcohols

Y. Mitamura, Y. Komori, S. Hayashi, Yoshiyuki Sugahara, Kazuyuki Kuroda

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    Magadiite, a layered sodium polysilicate, was organically modified by esterification of interlayer silanol groups with various aliphatic alcohols. Methanol was directly reacted with H-magadiite (acid-treated magadiite) by refluxing. The methanol-treated product showed an increase in the basal spacing and the 13C NMR signals due to methyl groups. The 2H NMR spectrum of CD3OD-treated H-magadiite showed Pake doublet patterns of quadrupole coupling constants of 43 and 48 kHz and asymmetry factors of 0, indicating the fixation of the C-O axis. When aliphatic alcohols with the carbon chain length longer than 4 were used, an H-magadiite/N-methylformamide (NMF) intercalation compound was used as an intermediate for esterification. The basal spacing of butanol-treated H-magadiite was 1.40 nm, the value of which was smaller than that of H-magadiite/NMF (1.63 nm) and larger than that of H-magadiite (1.15 nm). 13C spin-lattice relaxation times (T1) of butyl groups showed a low mobility of the α carbon. Other alcohols (CnH2n+1OH (n = 2-16) and (CH3)3-COH) were also reacted with the silanol groups. The differential thermal analysis (DTA) curves of the products showed exothermic peaks. The alkyl chains are apparently lying parallel to the inner surface because almost constant basal spacings were observed despite the variation in the alkyl chain length. The butanol-treated H-magadiite was dispersed in toluene and cast, resulting in the formation of a transparent nanocomposite film.

    Original languageEnglish
    Pages (from-to)3747-3753
    Number of pages7
    JournalChemistry of Materials
    Issue number10
    Publication statusPublished - 2001


    ASJC Scopus subject areas

    • Materials Chemistry
    • Materials Science(all)

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