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Thermally stable and flame‐retardant aromatic phosphate and cyclotriphosphazene‐containing polyurethanes: synthesis and properties
Author(s) -
Yuan C. Y.,
Chen S. Y.,
Tsai C. H.,
Chiu Y. S.,
ChenYang Y. W.
Publication year - 2005
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.593
Subject(s) - polyurethane , thermogravimetric analysis , materials science , differential scanning calorimetry , fire retardant , glass transition , char , polymer chemistry , polymer , thermal stability , polymerization , nuclear chemistry , chemical engineering , organic chemistry , composite material , pyrolysis , chemistry , physics , engineering , thermodynamics
A novel flame retardant (4‐diphenylphosphoryloxyphenoxy)(4‐hydroxyphenoxy)cyclotriphosphazene (PPPZ) was prepared and characterized by FT‐IR, 31 P‐NMR and 1 H‐NMR spectroscopy. Polyurethanes that contained aromatic phosphate groups attached to cyclotriphosphazene, with various phosphorus contents, were prepared from PPPZ, poly(propylene glycol), 1,4‐butanediol, and 2,4‐toluene diisocyanate by one‐step polymerization. The polymers prepared were characterized by FT‐IR, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and oxygen index (LOI) measurements. The effect of the concentration of PPPZ on the thermal behavior of the polyurethane was studied. The results indicated that the glass transition temperature ( T g ) of the polyurethane increased with the concentration of PPPZ. The PPPZ‐containing polyurethanes exhibited slightly higher temperatures of degradation and higher char yields than PPPZ‐free polyurethanes. Moreover, the LOI of the polyurethanes increased with increasing PPPZ content. Also studied was the possible mechanism of the flame retardancy. Copyright © 2005 John Wiley & Sons, Ltd.