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Preparation and thermal stability of boron-containing phenolic resin/microcrystalline muscovite composites

Abstract In order to further improve thermal stability of the boron-modified phenolic resin, we combined boron-modified phenolic resin and microcrystalline muscovite over a range of microcrystalline muscovite loadings (5–20 wt-%) to prepare composites. Microcrystalline muscovite was modified by titanate coupling agent. Fourier transmission-infrared analysis showed that the titanate coupling agent chemically bonded with the microcrystalline muscovite powder. The modified microcrystalline muscovite was mixed with boron-modified phenolic resin matrix in the molten state, and the composites were cured by compression moulding. Thermogravimetric analysis showed the effect of microcrystalline muscovite content to enhance decomposition temperatures and residual weight at 1000°C of the composites. Flexural test showed that the flexural strength before heat-treated was reduced with incremental loadings of microcrystalline muscovite fillers. On the contrary, after heat-treated at 1000°C, the flexural strength is increased. Scanning electron microscopy illustrated the microstructure evolution of the composites at elevated temperatures.