Synthesis and characterization of a novel flame retardant containing phosphorous and properties of its epoxy networks

• Main Authors: Ching-Tsan Lin, 林錦讚
• Other Authors: Tsung-Han Ho
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/72073316415961580817

碩士 === 國立高雄應用科技大學 === 化學工程與材料工程系 === 97 === Recently, research efforts have been focused on the non-halogen flame retardants for electronic applications. In this study, a novel phosphorous- containing additive flame retardant, DOPO-N, was synthesized through the reaction of 9,10-dihydro- 9-oxa-10-phosphaphnanthrene-10-oxide (DOPO) with nitrogen-containing compound. DOPO-N was characterized by elemental analysis, fourier transform infrared spectrum (FTIR), 1H-NMR and 31P-NMR spectroscopies, respectively. The curable epoxy resins with various phosphorus contents were prepared via the addition of DOPO-N. The curing behavior of curable epoxy resins were studied by differential scanning calorimetry (DSC). The flammability of cured epoxy resins was also studied by UL-94 vertical and limiting oxygen index (LOI). The nitrogen-phosphorus synergistic effect was also evaluated to achieve the required flame retardancy of polymer. The results show that the UL-94 V-0 rating (nonflammable) was achived by adding 0.5wt% phosphorus content and high LOI value (found 32) could achieved with a low phosphorus content around 1.0wt.%. The results can be implied that the flame retardency was improved by the incorporation of DOPO-N. As a fuction of synergistic effect of phousphorus and nitrogen elements, the thermosetting resins of DGEBA cured with BADCy or DDS revealed an excellent flame retardance.