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Studies of structures of poly-ε-caprolactam/montmorillonite nanocomposite: Part 1. Tests of compression moulded specimens
Authors:B Jurkowski  YA Olkhov
Institution:a Plastic and Rubber Processing Division, Institute of Material Technology, Poznan University of Technology, Piotrowo 3, 61-138 Poznan, Poland
b Institute of the Problems of Chemical Physics, Russian Academy of Sciences, 142 432 Chernogolovka, Moscow Region, Russia
Abstract:A poly-ε-caprolactam (PA6) taken as a reference and its nanocomposite (PNC) containing 1.6 wt.% of montmorillonite were examined. The specimens as discs were prepared by compression moulding at 235 °C and 70 MPa. Using the novel version of TMA, in the PA6 and PNC specimens, within the temperature range from −100 to 250 °C, a semi-crystalline structure with anisotropy of distribution of the more ordered (crystalline?) portion was found in the surface layer up to 0.5 mm thick. The amorphous regions have differed in a state of order (different transition temperatures) and related compactness. The free volume fraction in amorphous regions determined in machine direction (normal to the surface) is increased when in transverse direction is reduced; simultaneously molecular weights of polymer chains between junctions were increased by incorporation of the nanofiller.
Keywords:TMA  PA6  Montmorillonite  Nanocomposite  Topological structure  Molecular structure  Pseudo-network
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