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Hybrid nanocomposites of elastomeric polyurethane containing halloysite nanotubes and POSS nanoparticles: tensile, hardness, damping and abrasion performance

Published online by Cambridge University Press:  09 December 2020

Salma Taher Mohamed ,
Seha Tirkes ,
Alinda Oyku Akar  and
Umit Tayfun Open the ORCID record for Umit Tayfun [Opens in a new window]
Salma Taher Mohamed
Affiliation:
Chemical Engineering Department, Atilim University, 06830, Ankara, Turkey
Seha Tirkes
Affiliation:
Chemical Engineering Department, Atilim University, 06830, Ankara, Turkey
Alinda Oyku Akar
Affiliation:
R&D Center, Esan, 34852, Istanbul, Turkey
Umit Tayfun*
Affiliation:
Inovasens Ltd, Izmir Technopark, 35430, Izmir, Turkey
*
*E-mail: umit.tayfun@inovasens.com
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Abstract

Thermoplastic polyurethane (TPU) matrix was reinforced with polyhedral oligomeric silsesquioxane (POSS) and halloysite nanotubes (HNT), both separately and combined. Composite samples were fabricated using a melt-compounding method. Characterization of the composites obtained was performed via tensile and hardness tests, melt-flow index measurements (MFI), abrasion tests, dynamic mechanical analysis (DMA) and scanning electron microscopy (SEM) to investigate the mechanical performance, flow behaviour, tribological characteristics, thermo-mechanical response and morphological properties. The greatest tensile strength value was obtained for the smallest HNT content. Further addition of HNT resulted in agglomerations for both POSS and HNT particles. The shore hardness of TPU was enhanced by filler inclusions. The TPU/POSS composites displayed significant improvement in terms of abrasion resistance compared to TPU at lower loading levels. The DMA study showed that composites containing 0.5% POSS and 1.0% HNT displayed the greatest storage modulus. The glass-transition temperature of TPU shifted to smaller values with the addition of both nanoparticles. The HNT inclusions increased the MFI value of TPU because of their large aspect ratio. Homogeneous mixing of nanoparticles in the TPU matrix was confirmed by a SEM study of the composites. Their dispersion decreased as the concentrations of POSS and HNT increased. An adjuvant effect of POSS with HNT was achieved in their hybrid composites.

Keywords

Extrusionhalloysite nanotubehybrid compositesPOSSpolymer-clay compositesthermoplastic polyurethane
Type
Article
Information
Clay Minerals , Volume 55 , Issue 4 , December 2020 , pp. 281 - 292
Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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Footnotes

Associate Editor: Margarita Darder

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