Journal
POLYMERS
Volume 14, Issue 16, Pages -Publisher
MDPI
DOI: 10.3390/polym14163372
Keywords
epoxy resin; ceramifiable composites; mechanical properties; kaolin
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This paper investigates the thermal stability, phase change, and mechanical properties of epoxy resin/quartz fiber ceramifiable composites. The addition of glass frits and kaolinite ceramic filler greatly improves the thermal stability of the composites, generating a mullite ceramic phase at 1000 degrees C.
The application of epoxy resins in high temperature and thermal protection fields is limited due to their low decomposition temperature and low carbon residual rate. In this paper, epoxy resin (EP)/quartz fiber (QF) ceramifiable composites were prepared using a prepreg-molding process. The thermal stability, phase change and mechanical properties after high-temperature static ablation and ceramization mechanism of EP/QF ceramifiable composites were investigated. The addition of glass frits and kaolinite ceramic filler dramatically increases the thermal stability of the composites, according to thermogravimetric (TG) studies. The composite has a maximum residual weight of 61.08%. The X-ray diffraction (XRD) results show that the mullite ceramic phase is generated, and a strong quartz diffraction peak appears at 1000 degrees C. The scanning electron microscope (SEM) and element distribution analyses reveal that the ceramic phase generated inside the material, when the temperature reaches 1000 degrees C, effectively fills the voids in composites. The composites have a bending strength of 175.37 MPa at room temperature and retain a maximum bending strength of 12.89 MPa after 1000 degrees C treatment.
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