Release Time:2019-03-13  Hits:

Indexed by: Journal Article

Date of Publication: 2016-01-01

Journal: RSC ADVANCES

Included Journals: EI、SCIE

Volume: 6

Issue: 91

Page Number: 88403-88410

ISSN: 2046-2069

Abstract: 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.