Mullite Fiber Prepared by Sol-Gel Method Using LowMolecular-Weight Acids as Modifying Agents |
Yabin Zhang,a
Yingying Cui,a
Changfa Xiaoa, b and Lihua Wuc,*
Pages : 105-114
DOI : 10.1080/0371750X.2023.2181221 |
Abstract |
The quick increasing of sol viscosity shortens the spinning holding time and is not
helpful for the spinning procedure. How to postpone the rapid enhancement of sol
viscosity has become an important issue. In this study, mullite fiber was prepared by
sol-gel method using low molecular weight acid as modifying agent. The increase of
sol viscosity became slow when the low molecular weight acid was mixed in spinning
sol. TG/DSC analysis showed no peak corresponding to carboxylic acid group of
modifying agents. It was concluded that the carboxylic acid group reacted with hydroxyl
group and was absent in spinning sol. Fourier transform infrared analysis revealed
that absorption peak concerning ester group was present. It implied that the
esterification reaction was carried out between carboxylic group of low molecular
weight acid and hydroxylic radical. The measurement of X-ray diffraction indicated
that the mullization took place at 1100oC. The mullite fibers with smooth and dense
surface were obtained ultimately.
[Keywords: Mullite fibers, Low molecular weight acid, Viscosity, Esterification reaction] |
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