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DSC and Two-dimensional Correlation Infrared Spectroscopy Studies of PA6/Montmorillonite Composite Fibres

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The majority of research on polymer/layered silicate nanocomposite (PLSN) has focused on molded bulk materials with very few recent studies reporting on the formation of PLSN fibres. Hence, more research needs to be conducted in this area in order to better understand the formation and properties of PLSN nanofibres. In this paper composite fibres of PA6, and organically modified montmorillonite (MMT) of the type Cloisite 15A , were formed from the melt by means of a laboratory spinning machine. Fibres were extruded from the melt at a temperature of 240 °C and spun at take up velocities of 1200, 860, 460 m/min and extrusion velocity of 26 m/min. For the investigations we selected four kinds of manufactured undrawn filaments with the following compositions (by weight): 100/0, 99/1, 98/2 and 95/5 PA6/MMT. The effect of the MMT filler on PA6 crystalline morphology was examined by Fourier transform infrared spectroscopy (FTIR), IR microspectrocopy and differential scanning calorimetry (DSC). Because all the types of the fibres studied displayed both á and ă crystals, FTIR spectra were performed in wavenumber regions consisting of characteristic bands of these two polymorphs as well as the Si-O stretching wavenumber region. Analysis of FTIR spectra was performed by means of two-dimensional (2D) correlation spectroscopy. This technique revealed the composition-induced structural changes in the PA6/MMT composite fibres in detail. It was found that the content of montmorillonite in the core is higher than in the skin of the fibre, suggesting that during the formation process of the PA6/MMT composite fibres, montmorillonite was pushed into the fibre core.

Tags: 2D correlation IR, polyamide 6, montmorillonite, composite fibres, DSC.

Published in issue no 5-6 (64-65) / 2007, pages 22–26.

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