Abstract
A new cardanol-based benzoxazine monomer containing a hydroxyl group (CBZ) was synthesized and characterized by FT-IR and 1H NMR spectroscopy. The formation mechanism of cardanol-based polybenzoxazine/SiO2 hybrids from CBZ and tetraethoxysilane (TEOS) by sol-gel technique was invested by FT-IR analysis. FT-IR and SEM confirmed that there were many SiO2 particles formed and embedded in the cardanol-based polybenzoxazine. A phase separation occurred when the ratio (wt) of TEOS to CBZ was not less than 3 : 5. TGA results illuminated the thermal stability and char yield of cardanol-based polybenzoxazine could be enhanced due to the formation of SiO2 particles in the polybenzoxazine matrix. Incorporation of SiO2 could improve the surface de-wetting and anti-ultraviolet properties of the films. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
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