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Flame retardation improvement of aqueous‐based polyurethane with aziridinyl phosphazene curing system
Author(s) -
Huang WoeiKae,
Yeh JenTaut,
Chen KweiJu,
Chen KanNan
Publication year - 2000
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/1097-4628(20010124)79:4<662::aid-app100>3.0.co;2-t
Subject(s) - polyurethane , phosphazene , thermogravimetric analysis , curing (chemistry) , aqueous solution , materials science , polymer chemistry , swelling , nuclear chemistry , chemical engineering , chemistry , composite material , polymer , organic chemistry , engineering
Aziridinyl phosphazene (NPAZ) was introduced to aqueous‐based polyurethane (PU) as a flame retardant and a postcuring agent, mainly because of the presence of phosphorus compositions, as well as the reactive aziridinyl groups on NPAZ. This dual‐function NPAZ was prepared from the substitution reaction of hexachlorocyclotriphosphazene with aziridine. Aqueous‐based PU was treated with NPAZ and its curing reaction took place upon drying. The performance properties of this NPAZ cured PU (NPAZ‐PU) were improved and better than those of the original PU. The phosphorus composition from NPAZ was evenly distributed on this NPAZ‐PU film, which was identified by the phosphorus mapping on the energy dispersion spectrum. The physical and mechanical properties of NPAZ‐PU were evaluated by the measurements of the gel content, water uptake, ethanol swelling, and tensile stress. The thermal properties of NPAZ‐PU were investigated by thermogravimetric analysis (TGA), TG analyzer‐interfaced FTIR, and dynamic mechanical thermal analysis. Furthermore, its combustion behaviors were demonstrated with the data of a cone calorimeter measurement. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 79: 662–673, 2001