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Swelling behavior of montmorillonite cation exchanged for ω-amino acids by ∊-caprolactam

  • Arimitsu Usuki (a1), Masaya Kawasumi (a1), Yoshitsugu Kojima (a1), Akane Okada (a1), Toshio Kurauchi (a1) and Osami Kamigaito (a1)...
Abstract

Natural Na-montmorillonite was cation exchanged for the ammonium cations of various ω-amino acids [H3N+(CH2)n−1 COOH, n = 2, 3, 4, 5, 6, 8, 11, 12, and 18]. X-ray diffraction (XRD) results suggested that the chain axes of ω-amino acids with a carbon number of eight or less were parallel to the silicate layers, and that the chain axes of those with a carbon number of 11 or more were slanted to the layers. The cation-exchanged montmorillonites form intercalated compounds with ∊-caprolactam at 25 °C. The montmorillonites intercalated with both ω-amino acid and ∊-caprolactam were studied by XRD measurement at room temperature and 100 °C. We propose a model where amino acid molecules were arranged perpendicular to silicate layers and ∊-caprolactam molecules filled the space between them. When the ∊-caprolactam was melted at 100 °C, the basal spacing for the montmorillonite increased, in which the carbon number exceeds 11. This phenomenon will be applicable to obtaining the nylon 6-clay hybrid, a molecular composite of nylon 6 and montmorillonite.

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2Fukushima Y., Clay and Clay Minerals 32, 320 (1984).
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4Weiss A., Angew. Chem. Int. Ed. Eng. 2, 134 (1963).
5Presented in part at the MRS 1989 Fall Meeting, Boston, MA, November 1989, Abstract, 521 (1989).
6All absorbed water in montmorillonite vaporized below 120 °C in our experiments.
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Journal of Materials Research
  • ISSN: 0884-2914
  • EISSN: 2044-5326
  • URL: /core/journals/journal-of-materials-research
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