Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 138, Issue 32, Pages -Publisher
WILEY
DOI: 10.1002/app.50804
Keywords
composites; degradation; rubber; thermal properties
Categories
Funding
- National Natural Science Foundation of China [51703137]
- State Key Laboratory of Polymer Materials Engineering [sklpme2019-2-02]
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The ablative properties of epoxy modified silicone rubber composites filled with zinc borate (ZB) and aluminum hypophosphite (AHP) were improved by forming a dense char layer. The optimal ablative performance is achieved when the concentration of ZB and AHP is 10 and 5 phr, respectively. The structure and composition of the char layer were analyzed using various techniques.
The ablative properties of epoxy modified silicone rubber composites filled with zinc borate (ZB) and aluminum hypophosphite (AHP) were studied. The decomposition of the added fillers and covering connection of residual on the substrate contribute to the improvement of heat insulation. The ablation test shows that the formation of a dense char layer with certain strength is key to improving the ablative properties. The optimal ablative performance is achieved when the concentration of ZB and AHP is 10 and 5 phr, respectively. Under such circumstances, the linear ablation rate is as low as 0.032 mm/s, which is about 61% lower than the pure silicone rubber. Furthermore, the structure and composition of the formed char layer were analyzed using X-ray diffraction analysis, scanning electron microscopy, and Fourier transform infrared spectroscopy.
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