Cobalt-Containing Hyperbranched Poly(silylenearylene)s

  • Jianzhao Liu
  • Jacky W. Y. Lam
  • Matthias Häußler
  • Anjun Qin
  • Ben Zhong Tang
Article
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Accepted:

Abstract

A group of hyperbranched poly(silylenearylene)s are synthesized by homopolycyclotrimerizations of A2-type silylenediynes. The polymers can be readily metallized by complexations of their periphery triple bonds with cobalt octacarbonyls Co2(CO)8. Pyrolysis of these organometallic polymers gives magnetic ceramics in good yields. Analyses by SEM, TEM, XPS, EDX, and XRD demonstrate that the ceramics comprise ferromagnetic Co and paramagnetic Co2Si nanocrystallites wrapped by carboneous shell. The ceramics show high magnetic susceptibilities (M s up to ~50 emu/g) and near-zero coercivity (H c down to ~0.14 kOe), suggesting that they are good soft magnetic materials with low hysteresis loss.

Keywords

Hyperbranched poly(silylenearylene)s Organometallic polymers Magnetic ceramics 
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Notes

Acknowledgements

This work was partially supported by the Research Grants Council of Hong Kong (602706, HKU2/05C, 603505, 603304 and 604903), the National Science Foundation of China (20634020), and the Ministry of Science & Technology of China (2002CB613401). B. Z. Tang thanks to the support from the Cao Guangbiao Foundation of Zhejiang University.

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Jianzhao Liu
    • 1
  • Jacky W. Y. Lam
    • 1
  • Matthias Häußler
    • 1
  • Anjun Qin
    • 1
    • 2
  • Ben Zhong Tang
    • 1
    • 2
  1. 1.Department of ChemistryThe Hong Kong University of Science & TechnologyHong KongChina
  2. 2.Department of Polymer Science and EngineeringZhejiang UniversityHangzhouChina

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