Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
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Tetra-2,6-dimethyl phenyl resorcinol diphosphate (DMP-RDP), which is one of the phosphorus flame retardants exhibiting higher evaporation temperature, and various phenolic resins and their derivatives were employed to examine whether the synergistic effect of using them together could be observed on the flame retardance of ABS. For this purpose, various phenolic resins were incorporated into DMP-RDP as co-flame retardants and a series of ABS/DMP-RDP/char former compounds were manufactured and their flame retardancies were evaluated by measuring the Limiting Oxygen Index (LOI) values and UL-94V classes. The results showed that the incorporation of DMP-RDP/char former mixture is very effective in enhancing the thermal stability of ABS and that the LOI value as high as 53 is obtained for a certain formulation. The reason for this finding was believed to be originated from the crosslinking reaction between -OH or -COOH of char former and -OH generated from the combustion of DMP-RDP by a trans-esterification mechanism. Some direct evidences from FTIR experiments were presented. Moreover, optical microscopy analysis showed the formation of intumescent chars that were very dense. The effect of molecular weight of char former on the flame retardancies of the compounds are also discussed.
Tetra-2,6-dimethyl phenyl resorcinol diphosphate (DMP-RDP), which is one of the phosphorus flame retardants exhibiting higher evaporation temperature, and various phenolic resins and their derivatives were employed to examine whether the synergistic effect of using them together could be observed on the flame retardance of ABS. For this purpose, various phenolic resins were incorporated into DMP-RDP as co-flame retardants and a series of ABS/DMP-RDP/char former compounds were manufactured and their flame retardancies were evaluated by measuring the Limiting Oxygen Index (LOI) values and UL-94V classes. The results showed that the incorporation of DMP-RDP/char former mixture is very effective in enhancing the thermal stability of ABS and that the LOI value as high as 53 is obtained for a certain formulation. The reason for this finding was believed to be originated from the crosslinking reaction between -OH or -COOH of char former and -OH generated from the combustion of DMP-RDP by a trans-esterification mechanism. Some direct evidences from FTIR experiments were presented. Moreover, optical microscopy analysis showed the formation of intumescent chars that were very dense. The effect of molecular weight of char former on the flame retardancies of the compounds are also discussed.
Effect of oligomeric phenols on flame retardance enhancement of ABS
Kim, J. (Autor:in)
2003
12 Seiten, 9 Bilder, 24 Quellen
Aufsatz (Konferenz)
Englisch
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