Citation: Shi-cheng Qi, Guo Han, Hong-rui Wang, Ning Li, Xiao-a Zhang, Sheng-ling Jiang, Ya-fei Lu. Synthesis and Characterization of Carborane Bisphenol Resol Phenolic Resins with Ultrahigh Char Yield[J]. Chinese Journal of Polymer Science, ;2015, 33(11): 1606-1617. doi: 10.1007/s10118-015-1712-1 shu

Synthesis and Characterization of Carborane Bisphenol Resol Phenolic Resins with Ultrahigh Char Yield

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College of Materials Science and Engineering, Key Laboratory of Carbon Fiber and Functional Polymers of Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China

Corresponding author: Xiao-a Zhang, saladzhang@163.com
Received Date: 23 April 2015
Revised Date: 25 June 2015

Fund Project: This work was financially supported by the Fundamental Research Funds for the Central Universities (No. JD-1512).

Two carborane-containing resol phenolic resins (P1 and P2) with high boron content were synthesized via the reaction of carborane bisphenols (1 and 2) with formaldehyde in the presence of alkaline. HRMS results indicate that P1 is mainly composed of hydroxymethylated o-carborane bisphenols, the Mw of which was restrained around 500 due to the strong steric hindrance of o-carborane bisphenol. In contrast, the molecular weight of P2 was well regulated under various reaction conditions. The obtained resins were characterized with spectroscopic techniques including FTIR, 1H-NMR, 13C-NMR, and 11B-NMR, which gave satisfactory results. TGA studies show that P2 shows char yield of 88.9% and 92.9% at 900 ℃ under nitrogen and air respectively. The imported carborane cage endows phenolic resin with ultrahigh char yield. Particularly, the char yield of the obtained carborane-containing phenolic resin under air is higher than that under nitrogen. FTIR and XRD confirm that the carborane cage could react with oxygen to form B2O3 at elevated temperatures, which postpones the thermal decomposition of phenolic resin and accounts for the high char yield.
- Carborane-containing resol phenolic resin,
- High boron content,
- Char yield
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沈阳化工大学材料科学与工程学院沈阳 110142