Abstract
A multi-scale analysis, ranging from μm → nm → Å-scale on the influence of thermal treatment on the thermotropic copolyester based on 60 mol% (1,4)-hydroxybenzoic acid (B), 5 mol% (2,6)-hydroxynaphthoic acid (N), 17.5 mol% terephthalic acid (T) and 17.5 mol% biphenol (BP) - COTBP- was carried out. The Å and nm-scale structure was investigated by synchrotron scattering (WAXS and SAXS). Extruded tapes ca. 30 μm thick were annealed at 300 ºC under air, without tension. WAXS revealed fibre-like structure with crystalline order, whereas SAXS patterns exhibited diamond-shaped diffuse scattering and discrete meridional scattering elucidating structures along the fibre axis and periodic crystallites. Heat treatment produced roughness reduction, and WAXS patterns showed reflections sharpening indicating an improvement of molecular register and packing (molecular alignment and degree of crystallinity χ increased). Thermal treatment increased the thermal stability, melting transition and tensile Young’s modulus, E, along extrusion axis, whereas nanoindentation showed decrease of hardness and elastic modulus. Hence, a thermally-induced self-reinforcing effect was evidenced, with microstructure reorganization correlating with improved thermo-mechanical properties.
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Romo-Uribe, A., Reyes-Mayer, A., Sarmiento-Bustos, E. et al. Synchrotron scattering and nanoindentation of heat treated high performance thermotropic polymer. MRS Advances 3, 3709–3714 (2018). https://doi.org/10.1557/adv.2018.607
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DOI: https://doi.org/10.1557/adv.2018.607