| Summary: | 碩士 === 國立中興大學 === 化學工程學系 === 93 === The application of ATH is limited by the lower decomposition temperatures(200~210℃). It decomposes gradually with the loss of water acting as flame suppressant.
This proposal is aimed to organic modify ATH surface by surfactant and stearic acid and through its hydroxyl groups reacted with Tetraethylorthosilicate and Amionpropyl triethyoxysilane compounds by condensation reaction. High thermally stable silicone compounds will be utilized to impart a coating layer on ATH to improve the thermal decomposition temperatures. Also, the dispersion of modified ATH will be evaluated with respect to the dispersion of ATH in polypropylene (PP) matrix.
In the experiment of ATH absorb surfactant, find the ATH with the absorbing of cation surfactant is greater than anion surfactant. The ATH with stearic acid treatment, the analysis of contact angle is increased from 71.7o to 105.4o, represented the organic degree of the ATH.
The samples were prepared by melt blending method. To prepare PP/ATH composites, the content of ATH varied from 10、30、60wt%.
According to the result of TGA at 95 wt%, as the ATH increase in PP matrix, the decomposition temperature decreases. The value of LOI is proportional to the content of ATH. Dynamic mechanical analysis data shows the addition of aluminum trihydroxide enhances the storage modulus from 5.63 E8 Pa to 7.15 E8 Pa~1.90 E9 Pa measured at 30℃.
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