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Direct imaging and elemental mapping of microgels in natural rubber particles

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Abstract

Elemental distribution maps of Hevea brasiliensis natural rubber gels have been obtained using electron energy-loss spectroscopy imaging in a low-energy (80 kV) electron spectroscopy imaging transmission electron microscope. Two types of gels have been investigated: a microgel contained within the natural rubber particle, and a macrogel prepared by equilibrating dry natural rubber in toluene. Both types of gels are found to contain a high amount of calcium. The intraparticle microgel is dense and rich in calcium but poor in nitrogen, indicating the predominant role of calcium in cross-link formation. The macroscopic gel is inhomogeneous, with dense calcium-rich microgels interspersed in a matrix of a less dense gel. The significant level of nitrogen associated with the matrix of the less dense gel supports the role of proteinaceous materials in the formation of the macroscopic gel.

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Acknowledgements

The authors acknowledge support from FAPESP, CNPq and Pronex/Finep/MCT. This is a contribution from the Instituto do Milêno de Materiais Complexos (PADCT).

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Author notes

  1. Lay-Theng Lee

    Present address: Laboratoire Léon Brillouin (CEA-CNRS), CEA-Saclay, , 91191, Gif-sur-Yvette Cedex, France

Authors and Affiliations

  1. Instituto de Química, Universidade Estadual de Campinas, P.O. Box 6154, 13084–971, Campinas, SP, Brazil

    Márcia M. Rippel, Carlos A. P. Leite, Lay-Theng Lee & Fernando Galembeck

Authors
  1. Márcia M. Rippel
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  2. Carlos A. P. Leite
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  3. Lay-Theng Lee
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  4. Fernando Galembeck
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Correspondence to Lay-Theng Lee.

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M. Rippel, M., A. P. Leite, C., Lee, LT. et al. Direct imaging and elemental mapping of microgels in natural rubber particles. Colloid Polym Sci 283, 570–574 (2005). https://doi.org/10.1007/s00396-004-1187-z

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  • DOI: https://doi.org/10.1007/s00396-004-1187-z

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