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- Title
High-temperature pyrolysis of ceramic fibers derived from polycarbosilane–polymethylhydrosiloxane polymer blends with porous structures.
- Authors
Kita, Ken'ichiro; Narisawa, Masaki; Nakahira, Atsushi; Mabuchi, Hiroshi; Itoh, Masayoshi; Sugimoto, Masaki; Yoshikawa, Masahito
- Abstract
The polymer blends of PCS (polycarbosilane) and PMHS-h (polymethylohydrosiloxane with high molecular weight) were prepared by freeze-drying process of mixed benzene solution. Melt viscosity, mass loss, and gas evolution from prepared polymer blends were analyzed. A polymer blend of HSah15 (15 mass% PMHS-h to PCS) was melt-spun to fiber form, curing by thermal oxidation and pyrolyzed at various temperatures up to 1773 K. The obtained fibers were investigated by tensile tests, FE-SEM (field emission scanning electron microscope) observation, and XRD (X-ray diffraction) analysis. After pyrolysis at 1273 K, there were no pores in the cross section of the fiber derived from pure PCS; however, there were amounts of pores in the cross sections of the fiber derived from HSah15. After pyrolysis at 1773 K, the coarse β-SiC (silicon carbide) crystals were formed on the outside surface of the fiber derived from pure PCS; however, no remarkable β-SiC crystal were formed on the outside surface of the fiber derived from HSah15.
- Subjects
PYROLYSIS; CERAMIC fibers; POLYMERS; CHEMICAL reactions; INORGANIC fibers
- Publication
Journal of Materials Science, 2010, Vol 45, Issue 1, p139
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-009-3905-x