| Summary: | 碩士 === 正修科技大學 === 化工與材料工程研究所 === 98 === In this study, a novel phosphorous-silicon-containing additive flame retardant DOPO-Si, was synthesized through the reaction of 9,10-dihydro-9-oxa-10-
phosphaphenanthrene-10-oxide (DOPO) with Diallyldiphenylsilane, and the phosphorous-silicon-containing resultant was characterized by Fourier Tran-sform Infrared (FTIR), 1H Nuclear Magnetic Resonance (1H-NMR) and Nuclear Magnetic Resonance (31P-NMR) spectroscopes. The curable epoxy resins with various phosphorus contents were prepared via the addition of DOPO-Si. The curing behavior of curable resins were studied by differential scanning calorimeter (DSC) and the properties of cured resins were studied by Dynamic mechanical analysis (DMA),thermo-gravity analyzer (TGA) , Underwriter’s laboratory-94 vertical (UL-94V) and Limiting oxygen index (LOI). Moreover, the kinetics of thermal decomposition was evaluated by Kissinger method and Fiynn-Wall-Ozawa’s method. The results showed that the DOPO-Si containing cured epoxy resins will inecrease storage modulus (E’) and char yield by increase phosphorus contents. It is found that the activation energy at lower stage of the degradation decreased by the incorporation of flame retardant components, while increased at higher stage of the degradation. An increase in the phosphorus contents in the cured resins led to higher moisture absorption and lower dielectric constant. On adding 1wt.% phosphorus content, the UL-94 V-0 rating (nonflammable) was achived. High LOI value (found 31) could achieved with a low phosphorus contents around 0.5wt.%, which implied that the flame retardant was improved by the incorporation of DOPO-Si. As a fuction of synergistic effect of phosphorous and silicon elements, revealed an excellent flame retardant.
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