Elemental mapping in natural rubber latex films by electron energy loss spectroscopy associated with transmission electron microscopy.

نویسندگان

  • Márcia Maria Rippel
  • Carlos Alberto Paula Leite
  • Fernando Galembeck
چکیده

Element distribution maps from Hevea brasiliensis natural rubber latex thin films were obtained, by electron energy-loss spectroscopic imaging in a low-energy (80 kV) transmission electron microscope. C, N, O, P, Na, Ca, Mg, Al, Si, and S maps are presented for latex fractionated by centrifugation, either followed by dialysis or not. Most elements forming non-carbon compounds are concentrated in small, electron-dense spots surrounded by a carbon-rich matrix of polymer, thus showing that the rubber is filled with small particles compatible with the polyisoprene matrix. Ca distribution is unique, since it closely parallels the C distribution, evidencing an important role for -COO(-)-Ca2+-COO- ionic bridges in the structure of natural rubber.

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عنوان ژورنال:
  • Analytical chemistry

دوره 74 11  شماره 

صفحات  -

تاریخ انتشار 2002