The possibility of utilizing 3-chloro-1,4,7-heptanetriol (3CH) and 3-diethylphosphono-1,4,7-heptanetriol (3DFH), both obtained from fural, as reactive flame retardants in rigid polyurethane (PUR) foams was investigated. These compounds were used individually for the modification of PUR foams. In the case of 3CH also a synergistic Cl/Sb system with antimony oxide was used. The main mechanical and thermal properties as well as fire resistance of the modified PUR foams were determined. It was shown that the use of both triols effectively reduced the combustibility without adversely affecting the useful characteristics of the examined materials. It was also found that 3DFH was more efficient as flame retardant and the efficiency of 3CH could be increased by using it in a synergistic
system with antimony oxide.
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