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Synchrotron scattering and nanoindentation of heat treated high performance thermotropic polymer

Published online by Cambridge University Press:  12 November 2018

A. Romo-Uribe ,
A. Reyes-Mayer ,
E. Sarmiento-Bustos ,
M. Calixto-Rodriguez  and
K. Santiago-Santiago
A. Romo-Uribe*
Affiliation:
Polymer Nanocomposites Laboratory LNyC, Cuernavaca Mor.62230, MEXICO
A. Reyes-Mayer
Affiliation:
Centro de Caracterización e Investigación en Materiales S.A. de C. V., Calle 21 Este #205, Bodega F, Col. Civac, Jiutepec, Mor.62578, MEXICO Universidad Tecnologica Emiliano Zapata del Estado de Morelos UTEZ, Av. Universidad Tecnologica No. 1, Col. Palo Escrito, Emiliano Zapata, Mor.62760, MEXICO
E. Sarmiento-Bustos
Affiliation:
Universidad Tecnologica Emiliano Zapata del Estado de Morelos UTEZ, Av. Universidad Tecnologica No. 1, Col. Palo Escrito, Emiliano Zapata, Mor.62760, MEXICO
M. Calixto-Rodriguez
Affiliation:
Universidad Tecnologica Emiliano Zapata del Estado de Morelos UTEZ, Av. Universidad Tecnologica No. 1, Col. Palo Escrito, Emiliano Zapata, Mor.62760, MEXICO
K. Santiago-Santiago
Affiliation:
Universidad Tecnologica Emiliano Zapata del Estado de Morelos UTEZ, Av. Universidad Tecnologica No. 1, Col. Palo Escrito, Emiliano Zapata, Mor.62760, MEXICO
*
*(Email: [email protected])
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Abstract

A multi-scale analysis, ranging from μm → nm → Å-scaie on the influence of thermal treatment on the thermotropic copolyester based on 60 mol% (l,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 °C 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 seif-reinforcing effect was evidenced, with microstructure reorganization correlating with improved thermo-mechanical properties.

Keywords

polymermicrostructurenanostructurenano-indentationx-ray diffraction (XRD)
Type
Articles
Information
MRS Advances , Volume 3 , Issue 62: International Materials Research Congress XXVII , 2018 , pp. 3709 - 3714
Copyright
Copyright © Materials Research Society 2018 

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