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Thermal properties of polyethylene/montmorillonite nanocomposites prepared by intercalative polymerization

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Abstract

A comparative study of thermal and thermal-oxidative degradation processes for polyethylene/organically modified montmorillonite (PE-MMT) nanocomposites, prepared by the ethylene intercalative polymerization in situ with or without subsequent addition of an antioxidant is reported. The results of TGA and time/temperature-dependent FTIR spectroscopy experiments have provided evidence for an accelerated formation and decomposition of hydroperoxides during the thermal oxidative degradation tests of PE-MMT nanocomposites in the range of 170–200 °C as compared to the unfilled PE, thus indicating to a catalytic action of MMT. It has been shown that effective formation of intermolecular chemical cross-links in the PE-MMT nanocomposite has ensued above 200 °C as the result of recombination reactions involving the radical products of hydroperoxides decomposition. Apparently, this process is induced by the oxygen deficiency in PE-MMT nanocomposite due to its lowered oxygen permeability. It is shown that the intermolecular cross-linking and dehydrogenation reactions followed by the shear carbonization lead to appreciable increase of thermal-oxidative stability of PE nanocomposite, as compared to that of pristine PE. Notably, the TGA traces for the antioxidant-stabilized PE-MMT nanocomposites recorded in air were quite similar to those obtainable for the non-stabilized PE-MMT nanocomposites in argon. The results of treatment of the experimentally acquired TGA data in frames of an advanced model kinetic analysis are reported and discussed.

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Acknowledgements

This work is supported by Russian Foundation for Basic Research (Grant No. 06-03-08047) and Federal Agency on Science and Innovations (Contract No. 02.513.11.3161).

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Authors and Affiliations

  1. N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Kosygin 4, 119334, Moscow, Russia

    Sergei Modestovich Lomakin & Alexander N. Shchegolikhin

  2. N.N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Kosygin 4, 119991, Moscow, Russia

    Lyudmila A. Novokshonova & Peter N. Brevnov

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  1. Sergei Modestovich Lomakin
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  2. Lyudmila A. Novokshonova
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  3. Peter N. Brevnov
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  4. Alexander N. Shchegolikhin
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Correspondence to Sergei Modestovich Lomakin.

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Lomakin, S.M., Novokshonova, L.A., Brevnov, P.N. et al. Thermal properties of polyethylene/montmorillonite nanocomposites prepared by intercalative polymerization. J Mater Sci 43, 1340–1353 (2008). https://doi.org/10.1007/s10853-007-2295-1

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