Abstract
ABSTRACTThe halogen‐free flame retardance of natural fiber is an everlasting challenge due to the well‐known poor solubility of phosphazene in water. In this case, a new cyclotriphosphazene derivative (MCP) was synthesized. It was etherized hexamethylolmelamine (HMMM) and hexachloro‐cyclotriphosphazene (HCCP) by one pot reaction. It was characterized by1H NMR,13C NMR,31P NMR, FT‐IR, TGA, SEM, limited oxygen index (LOI) and vertical flame testing. The MCP has good solubility in water and thermosetting MCP has compact structure which can expand several times after burning. Cotton gauze was soaked in six different concentration of aqueous solutions of MCP (0 wt %, 5 wt %, 10 wt %, 15 wt %, 20 wt % and 25 wt %, respectively) to obtain the flame retardant cloth. The cloth was soaked in 20 wt % MCP solution had higher char yield and LOI. They had no any afterflame and afterglow, and gauze 2‐ gauze 5 cannot be burned out in 12s ignition time. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2016,133, 43555.
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