The reactions of the dihydroxylated cyclotriphosphazenes, (3,5-dihydroxyphe
noxy)(pentaphenoxy)cyclotriphosphazene 1 and 2,2-bis(4-hydroxyphenoxy)- bis
[spiro(2',2 "-dioxy-1',1 "-biphenylyl)]cyclotriphosphazene 2 with hexamethy
lene 1,6-diisocyanate (HDI) lead to the new cyclotriphosphazene containing
polyurethanes 3 and 4, respectively. The condensation polymerization of 1 a
nd 1,3-bis(hydroxy)benzene 5, or of 2 and 3,3'-(ethylenedioxy)diphenol 6 in
a one step reaction allowed us to synthesize the copolymers poly(1-co-5),
and poly(2-co-6). The thermal stability and degradation behavior of 3, 4 an
d copolymers were investigated by thermogravimetric analysis in air, and co
mpared with that of polyurethanes synthesized from the 5-HDI and 6-HDI reac
tions. The evolution of the IR spectra and thermogravimetric analysis curve
s of the copolymers vs the cyclotriphosphazene content were studied. (C) 19
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