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

Content Provider	Semantic Scholar
Author	Feng, Guo Jiang, Feng Jiang, Weihui Liu, Jian-Min Zhang, Quan Hu, Qing Miao, Liangsheng Wu, Qian Liang, Jian
Copyright Year	2019
Abstract	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.
File Format	PDF HTM / HTML
DOI	10.3390/polym11122007
PubMed reference number	31817124
Journal	Medline
Volume Number	11
Alternate Webpage(s)	https://res.mdpi.com/d_attachment/polymers/polymers-11-02007/article_deploy/polymers-11-02007.pdf
Alternate Webpage(s)	https://doi.org/10.3390/polym11122007
Journal	Polymers
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article