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Thermooxidative degradation of injection-moulded sepiolite/polyamide 66 nanocomposites

Published online by Cambridge University Press:  05 July 2018

A. Yebra-Rodríguez ,
C. Fernández-Barranco ,
M. D. La Rubia ,
A. Yebra ,
A. B. Rodríguez-Navarro  and
J. Jiménez-Millán
A. Yebra-Rodríguez*
Affiliation:
Department of Geology and CEACTierra, Associated Unit IACT (CSIC-UGR), Faculty of Experimental Sciences, University of Jaén, Campus Las Lagunillas s/n, 23071 Jaén, Spain
C. Fernández-Barranco
Affiliation:
Department of Geology and CEACTierra, Associated Unit IACT (CSIC-UGR), Faculty of Experimental Sciences, University of Jaén, Campus Las Lagunillas s/n, 23071 Jaén, Spain
M. D. La Rubia
Affiliation:
Department of Chemical, Environmental and Materials Engineering, Higher Polytechnic School, University of Jaén, Campus Las Lagunillas s/n, 23071 Jaén, Spain
A. Yebra
Affiliation:
Department of Optics, Faculty of Sciences, University of Granada, Campus Fuentenueva s/n, 18071 Granada, Spain
A. B. Rodríguez-Navarro
Affiliation:
Department of Mineralogy and Petrology, Faculty of Sciences, Campus Fuentenueva s/n, 18071 Granada, Spain
J. Jiménez-Millán
Affiliation:
Department of Geology and CEACTierra, Associated Unit IACT (CSIC-UGR), Faculty of Experimental Sciences, University of Jaén, Campus Las Lagunillas s/n, 23071 Jaén, Spain
*
* E-mail: ayebra@ujaen.es
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Abstract

Clay/polymer nanocomposites (CPN) exhibit improved technical properties compared to their microand macro-counterparts. Nevertheless, thermal degradation of CPN may limit the applicability of these hybrid materials. In this paper accelerated ageing (110°C and 150°C) was performed in injection moulded pure polyamide 66 (PA66-S-0 samples) and polyamide 66 reinforced with 5 wt.% sepiolite (PA66-S-5 samples) CPN. Polymer degradation was monitored by the amount of newly formed carbonyl bonds. The carbonyl indices obtained indicate that degradation occurs to a greater extent as the temperature of the ageing process increases. Moreover, the degradation increases with time at the highest treatment temperature (150°C). On the other hand, the occurrence of carbonaceous silicates in the nanocomposite samples at high temperatures yields greater thermal stability of sepiolite/PA66 nanocomposites compared to pure PA66. Furthermore, the sepiolite nanofibres maintain their position in the reticulated semicrystalline structure. In agreement with those results, differential scanning calorimetry and X-ray diffraction analyses show that the motion of the amide groups in the polymer chains are constrained by the well dispersed sepiolite.

Keywords

sepiolitenanocompositespolyamide 66thermal degradation
Type
Research Article
Information
Mineralogical Magazine , Volume 78 , Issue 5 , October 2014 , pp. 1227 - 1239
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

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