- Synthesis and thermal properties of an acetylenic monomer containing boron and silicon
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- 论文类型： 期刊论文
- 发表时间： 2016-01-01
- 发表刊物： RSC ADVANCES
- 收录刊物： SCIE、EI
- 卷号： 6
- 期号： 91
- 页面范围： 88403-88410
- ISSN号： 2046-2069
- 摘要： To improve the thermo-oxidative stability of acetylenic aromatic compounds, 1,2-bis(4-trimethylsilylethynylphenyl)-carborane (CBTMS) was designed, synthesized and characterized by FT-IR, H-1-NMR, C-13-NMR and mass spectrometry. The analysis of the DSC results showed that the acetylenic monomer had a melting point at 195.5 degrees C. The cross-linking process of CBTMS included a Diels-Alder cycloaddition reaction confirmed by FT-IR spectroscopy. Nonisothermal DSC studies showed CBTMS has an activation energy similar to that of the phenylethynyl-terminated compound. The thermoset and ceramic derived from the acetylenic monomer exhibited extremely thermo-oxidatively stable properties studied using thermogravimetric analysis (TGA). The thermoset showed a weight gain in air at elevated temperature and char yield of 98.8% at 1000 degrees C in air, and the ceramic residue had almost no weight loss up to 1000 degrees C in air. We demonstrated that trimethylsilylethynyl could be used as a crosslinking group for thermosetting polymers.
