Pyrolyzability of Preceramic Polymers

Abstract

This chapter reviews pyrolyzability of preceramic polymers. The pyrolyzability of a given precursor should then be considered from a practical point view of whether the precursor gives the desired composition and with reasonably high yield. A precursor should, therefore, have at least two inherent characteristics: latent reactivity and branched structures. The latent reactivity can provide the opportunity for cross-linking and thereby provide for both maintaining appropriate shape during processing and high ceramic yield. The changes in density are also discussed. The pyrolyzability of a fair number of silicon carbide (SiC), silicon nitride (Si3N4), and Si3N4/SiC precursors are examined. The data includes approximate structures/representations of the precursors, the pyrolysis conditions, and the compositions of the residues. Pyrolysis data on boron-containing precursors with various structures are tabulated. Conversion of a precursor to its respective ceramics involves numerous reactions. During the pyrolysis process, volatile organic species are generated and eliminated, which may drastically lower the ceramic yield. Cross-linking of the preceramic polymers before pyrolysis is often necessary to help retention of the ceramic elements in the solid states, thereby improving the desirable ceramic yields.

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Title
Pyrolyzability of Preceramic Polymers
Book Title
Physical Properties of Polymers Handbook
Book DOI
10.1007/978-0-387-69002-5
Chapter DOI
10.1007/978-0-387-69002-5_58
Part of
Volume
Editors
  • James E. Mark Send Email (1)
  • Editor Affiliation
  • 1 Department of Chemistry, University of Cincinnati, Crosley Tower, Martin Luther King Drive, 45221-0172, Cincinnati, OH
  • Authors
  • Yi Pang Send Email (2)
  • Ke Feng (3)
  • Yitbarek H. Mariam (4)
  • Author Affiliation
  • 2 Department of Chemistry, University of Akron, 44325-3601, Akron, OH
  • 3 Department of Chemistry & Center for High Performance Polymers and Composit, Clark Atlanta University, 30314, Atlanta, GA
  • 4 Department of Chemistry & Center for High Performance Polymers and Composit, Clark Atlanta University, 30314, Atlanta, GA
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