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Design of new HDPE/silica nanocomposite and its enhanced melt strength

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Abstract

Linear polymers are restricted to use in processes that involve severe extensional deformation, such as fiber spinning, film blowing, and thermoforming. To extend their applicability, the extensional properties of polymer melts should be enhanced such that strain hardening, which is defined as an increase in extensional viscosity under a large strain that deviates from the linear viscoelastic curve, is pronounced. In this study, a novel preparation method of linear polymer/inorganic nanocomposites was proposed with a main focus on enhanced melt strength. The design of molecular structure consists of three components—linear polymer, compatibilizer, and surface-modified particles. High-density polyethylene was used as a linear polymer while polyethylene grafted with maleic anhydride was used as a compatibilizer. Silica particles were synthesized and modified on their surfaces by 3-aminopropyltriethoxysilane. The strain hardening behavior of the surface-modified silica composites was pronounced. However, such a result was not observed for the composites of the same composition with pure-silica. In addition, the dispersion of the modified silica was much better than that of pure-silica.

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Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) grant (No. 20100027746) funded by the Korea government (MEST).

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Authors and Affiliations

  1. School of Chemical and Biological Engineering, Seoul National University, Seoul, 151-742, South Korea

    Hyung Tag Lim, Kyung Hyun Ahn & Seung Jong Lee

  2. Department of Chemical Engineering, Soongsil University, Seoul, 156-743, South Korea

    Joung Sook Hong

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  1. Hyung Tag Lim
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  2. Kyung Hyun Ahn
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Correspondence to Kyung Hyun Ahn.

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Lim, H.T., Ahn, K.H., Lee, S.J. et al. Design of new HDPE/silica nanocomposite and its enhanced melt strength. Rheol Acta 51, 143–150 (2012). https://doi.org/10.1007/s00397-011-0599-1

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  • DOI: https://doi.org/10.1007/s00397-011-0599-1

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