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Preparation of Nylon 6–Organoclay Nanocomposites via In-Situ Polymerization and Investigation of the Crystalline and Thermal Properties

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In this study, organoclay nanocomposites based on two types of organoclay: montmorillonite intercalated with dimethyle, dehydrogenated tallow quaternary ammonium cation (Cloisite 20A) and dimethyl, 2-ethyl hexyl hydrogenated tallow alkyl ammonium cation (Cloisite 30B) with nylon 6 were prepared through in-situ polymerization. In this experiment, no solvents were used during the synthesis, a method which is employed in green chemistry approach. The organoclay was dispersed in molten monomer (caprolactam) and polymerization took place. Transmission electron microscopy (TEM), X-ray diffraction (XRD), Differential Scanning Calorimetry (DSC), Thermogravimetry analysis (TGA), Fourier Transform Infrared (FT-IR) and Ultra Violet (UV) absorbance techniques were used to characterize the two types of nanocomposites. The full exfoliation morphology of the two nanocomposites was shown by XRD. DSC analysis showed that crystalline structures of PA 6 were predominantly α form, with traces of the γ and β forms. While the addition of Cloisite 20A increased the amount of γ and β forms, Cloisite 30B eliminated crystalline β form and increased the γ form, so that γ form became predominant crystalline form. FT-IR spectroscopy indicated some of the PA chains grafted on to montmorillonite surface modified by ammonium cations bearing hydroxyl groups.
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Keywords: CRYSTALLINE STRUCTURE; IN-SITU POLYMERIZATION; NANOCOMPOSITE; NYLON 6; ORGANOCLAY; THERMAL PROPERTIES

Document Type: Research Article

Publication date: 2009-06-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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