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Hydrogenated polyisoprene-silica nanoparticles and their applications for nanocomposites with enhanced mechanical properties and thermal stability

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Abstract

Hydrogenated polyisoprene (HPIP)-SiO2 nanocomposites were synthesized via differential microemulsiion polymerization followed by diimide hydrogenation. First, the isoprene monomer was polymerized on the silane treated nanosilica by differential microemulsion polymerization to obtain polyisoprene (PIP)-SiO2 nanoparticles with a particle size of 43 nm. PIP-SiO2 latex was subsequently hydrogenated at the carbon–carbon double bonds by diimide reduction in the presence of hydrazine and hydrogen peroxide with boric acid as promotor to provide HPIP-SiO2 nanocomposites. Core–shell morphology consisting of silica as the nano-core encapsulated by HPIP as the nano-shell was formed. The highest hydrogenation degree of 98 % was achieved at a ratio of hydrogen peroxide to hydrazine of 1.5:1. The nanosized HPIP-SiO2 at 98 % hydrogenation showed a maximum degradation temperature of 521 °C resulting in excellent thermal stability, compared with unfilled PIP (387 °C). A new nanocomposite of HPIP-SiO2 could be used as a novel nanofiller in natural rubber. Consequently, HPIP-SiO2/NR composites had improved mechanical properties and exhibited a good retention of tensile strength after thermal aging and good resistance toward ozone exposure.

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Acknowledgments

The authors gratefully acknowledge the support from the Thailand Research Fund (through the Royal Golden Jubilee Project), Graduate School, Chulalongkorn University, the Natural Sciences and Engineering Research Council of Canada (NSERC), the Thai Government Stimulus Package 2 (TKK2555) under the Project for Establishment of Comprehensive Center for Innovative Food, Health Products, and Agriculture and the National Research University Project of CHE and Ratchadaphiseksomphot Endowment Fund (AM1024I).

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Authors and Affiliations

  1. Program in Petrochemistry and Polymer Science, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand

    Anong Kongsinlark

  2. Department of Chemical Engineering, University of Waterloo, Waterloo, ON, N2L3G1, Canada

    Garry L. Rempel

  3. Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand

    Pattarapan Prasassarakich

Authors
  1. Anong Kongsinlark
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  2. Garry L. Rempel
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  3. Pattarapan Prasassarakich
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Corresponding authors

Correspondence to Garry L. Rempel or Pattarapan Prasassarakich.

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Kongsinlark, A., Rempel, G.L. & Prasassarakich, P. Hydrogenated polyisoprene-silica nanoparticles and their applications for nanocomposites with enhanced mechanical properties and thermal stability. J Nanopart Res 15, 1612 (2013). https://doi.org/10.1007/s11051-013-1612-7

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  • DOI: https://doi.org/10.1007/s11051-013-1612-7

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