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Open AccessArticle

Pressure Field Assisted Polycondensation Nonaqueous Precipitation Synthesis of Mullite Whiskers and Their Application as Epoxy Resin Reinforcement

1
National Engineering Research Center for Domestic & Builing Ceramics, Jingdezhen Ceramic Institute, Jingdezhen 333000, China
2
Department of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333000, China
3
Jiangxi Ceramic Research Institute, Jingdezhen 333000, China
*
Authors to whom correspondence should be addressed.
Polymers 2019, 11(12), 2007; https://doi.org/10.3390/polym11122007
Received: 6 November 2019 / Revised: 27 November 2019 / Accepted: 3 December 2019 / Published: 4 December 2019
(This article belongs to the Special Issue Polymer Processing and Surfaces)
Mullite whiskers were novelty prepared via pressure field assisted polycondensation nonaqueous precipitation method. The precipitate phase transition in heating process, phase compositions and microstructure of samples calcined at different temperatures, effect of pressure field on precursors polycondensation and AlF3 amount on sample morphology, the structure and the growth mechanism of whiskers were investigated. The results indicate that pressure field caused by kettle treatment promotes the polycondensation reaction between AlF3 and tetraethyl orthosilicate (TEOS), the excess aluminum fluoride coordinates with the precipitate skeleton of the =Al–O–Si≡, which brings about the low mullitization temperature (900 °C). The sample prepared with the optimal amount of aluminum fluoride (1.3 of the theoretical amount) calcined at 1100 °C presents high yield and aspect ratio (>15, 100 nm in diameter) of mullite whiskers. Growth of whiskers prepared via pressure field assisted polycondensation nonaqueous precipitation method is attributed to a vapor-solid (VS) mechanism with the inducement of screw. These mullite whiskers with the structure of multi-needle whiskers connected in the same center can be distributed evenly in epoxy resin, which greatly improves the mechanical properties of epoxy resin.
Keywords: mullite; whiskers; nonaqueous precipitation method; aluminum fluoride; polar transformation; screw mullite; whiskers; nonaqueous precipitation method; aluminum fluoride; polar transformation; screw
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MDPI and ACS Style

Feng, G.; Jiang, F.; Hu, Z.; Jiang, W.; Liu, J.; Zhang, Q.; Hu, Q.; Miao, L.; Wu, Q.; Liang, J. Pressure Field Assisted Polycondensation Nonaqueous Precipitation Synthesis of Mullite Whiskers and Their Application as Epoxy Resin Reinforcement. Polymers 2019, 11, 2007.

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