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Polyethylene/synthetic boehmite alumina nanocomposites: structure, mechanical, and perforation impact properties

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Abstract

Synthetic boehmite alumina (BA) has been incorporated up to 8 wt% in high-density polyethylene (HDPE) and low-density polyethylene (LDPE) by melt compounding. The primary nominal particle sizes of the two BA grades used were 40 and 74 nm, respectively. The dispersion of the BA in PE matrices was investigated by scanning and transmission electron microscopy techniques (SEM and TEM). Specimens of the PE/BA nanocomposites were subjected to dynamic-mechanical thermal analysis (DMTA), static tensile and instrumented falling weight impact (IFWI) tests. It was established that BA was nanoscale dispersed in both HDPE and LDPE. According to DMTA, BA worked as reinforcing filler. This was confirmed in static mechanical tests, too. BA grades and contents influenced the static tensile and dynamic IFWI behaviors of the PE/BA nanocomposites differently. Surprisingly, BA incorporation enhanced the ductility (elongations at yield and break) of HDPE in contrast to LDPE. Unlike HDPE/BA nanocomposites, the perforation impact resistance of the LDPE/BA systems was reduced with increasing BA content at both ambient temperature and T = −30 °C. The lesser the reduction the higher the primary particle size of the BA was.

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Acknowledgements

This work was part of a collaboration project between Hungary and Republic of South Africa (RSA). The authors thank Prof. S. Sinha Ray (Nanocenter—Council for Scientific and Industrial Research, Pretoria, RSA) for preparation and testing facilities. The BA was kindly provided by Dr. O. Torno (Sasol GmbH, Hamburg, Germany).

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Authors and Affiliations

  1. Polymer Technology, Faculty of Mechanical Engineering and Built Environment, Tshwane University of Technology, Pretoria, 0001, Republic of South Africa

    V. M. Khumalo & J. Karger-Kocsis

  2. Polymer Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, 1111, Budapest, Hungary

    J. Karger-Kocsis

  3. Institut für Makromolekulare Chemie und Freiburger Materialforschungszentrum, Albert-Ludwigs-Universität Freiburg, Stefan-Meier-Str. 31, 79104, Freiburg, Germany

    R. Thomann

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  1. V. M. Khumalo
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  2. J. Karger-Kocsis
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  3. R. Thomann
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Correspondence to J. Karger-Kocsis.

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Khumalo, V.M., Karger-Kocsis, J. & Thomann, R. Polyethylene/synthetic boehmite alumina nanocomposites: structure, mechanical, and perforation impact properties. J Mater Sci 46, 422–428 (2011). https://doi.org/10.1007/s10853-010-4882-9

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  • DOI: https://doi.org/10.1007/s10853-010-4882-9

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