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Polymer–ceramic conversion of a highly branched liquid polycarbosilane for SiC-based ceramics
| Content Provider | Semantic Scholar |
|---|---|
| Author | Li, Houbu Zhang, Litong Cheng, Laifei Wang, Yiguang Yu, Zhaoju Huang, Muhe Tu, Huibin Xia, Haiping |
| Copyright Year | 2008 |
| Abstract | Liquid polycarbosilane (LPCS) with a highly branched structure was characterized by fourier-transform infrared spectrometry (FT-IR) and 1H, 13C, 29Si nuclear magnetic resonance spectrometry (NMR). The LPCS was then cured and pyrolysized up to 1,600 °C under flowing argon. The structural evolution process was studied by thermogravimetric analysis and differential scanning calorimetry (TG-DSC), FT-IR, and X-ray diffraction (XRD). Hydrosilylation, dehydrocoupling, and polymerization cross-linking reactions between Si–H and C=C groups occurred at low temperatures, which mainly accounted for the high ceramic yield (70%) up to 1,400 °C. The organic groups gradually decomposed and the structure rearranged at high temperatures. The FT-IR analysis revealed that Si–CH2–Si chains, the backbone of original polymer, can be retained up to 1,200 °C. At temperatures higher than 1,200 °C, the Si–CH2–Si chains broke down and crystalline SiC began to form. The final crystalline products were β-SiC and a small amount of carbon. |
| Starting Page | 2806 |
| Ending Page | 2811 |
| Page Count | 6 |
| File Format | PDF HTM / HTML |
| DOI | 10.1007/s10853-008-2539-8 |
| Volume Number | 43 |
| Alternate Webpage(s) | https://core.ac.uk/download/pdf/41348896.pdf |
| Alternate Webpage(s) | https://doi.org/10.1007/s10853-008-2539-8 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
