Flame retardation improvement of aqueous‐based polyurethane with aziridinyl phosphazene curing system

Thermal decomposition, combustion and fire‐retardancy of polyurethanes—a review of the recent literature

“…In the literature, it was suggested to ‘post‐cure’ water‐based carboxyl‐containing PU prepolymers with phosphorus‐containing aziridines 77–79. Two compounds were prepared from the substitutions of phosphorus oxychloride with aziridine (Scheme ) or with aziridine and N , N ‐diethylamine (Scheme ) 77…”

“…Aziridinyl phosphazene was prepared from the substitution reaction of hexachlorocyclotriphosphazene with aziridine (Scheme ) 79…”

New crosslinked polymer from a rapid polymerization of acrylic acid with triaziridine‐containing compound

“…A series of multi‐AZ curing agents have been applied for a curing reaction of aqueous‐based PU,3–11 water‐reducible epoxy resin,12–15 aqueous‐based acrylate emulsion,16, 17 aqueous polymeric inks18, 19 and their hybridized resins 20, 21. Moreover, phosphorus‐containing multi‐AZ curing agent is used as a curing agent as well as a reactive flame retardant 22–25. Key of these curing processes is based on a ring‐opening reaction between AZ moiety of curing agent and carboxylic acid‐containing aqueous polymer on drying.…”

Synthesis, thermal and photophysical properties of phenoxy-substituted dendrimeric cyclic phosphazenes

“…Column chromatography was performed on silica gel (Merck, Kieselgel 60, 230-400 mesh; for 3 g crude mixture, 100 g silica gel was used in a column of 3 cm in diameter and 60 cm in length) and preparative thin layer chromatography was performed on silica gel 60 P F 254 . 1 H, 13 C and 31 P NMR spectra were recorded in CDCl 3 or toluene-d 8 solutions on a Varian 500 MHz spectrometer. Thermal properties of compounds were investigated on Mettler Toledo TGA/SDTA 851 thermogravimetric analysis (TGA) and differential scanning calorimeter (DSC) DSC 821 e equipped with Mettler Toledo Star e software at a heating rate of 10°C min À1 under nitrogen flow (50 ml min À1 ).…”

“…The thermal stability and flame resistance of polyphosphazenes that bear aryloxy side groups are especially well documented, and aryloxyphosphazene polymers have been developed commercially as foams for electrical, heat and sound insulation [10][11][12]. Cyclotriphosphazenes have also been investigated as flame retardant additives to organic polymers [13]. Compositions that contain cyclotriphosphazenes or polyphosphazenes with commercial polymers are relatively easy to prepare, and flame retardant poly(urethane) [14], poly(methylmethacrylate) [15], polystyrene [16] and various other polymers [17] have been produced in this way.…”