N-Methylaniline-, diphenylamine-, and N-phenylnaphthylamine-blocked toluene
diisocyanates (TDI) were prepared and characterized by IR, NMR spectroscop
y, and nitrogen content analyses. The structure-property relationship of th
ese adducts was established by reacting with hydroxyl-terminated polybutadi
ene (HTPB). The cure rate of the adduct increases from the N-phenylnaphthyl
amine- to diphenylamine- and to N-methylaniline-blocked TDI adduct. Simulta
neous TGA/DTA results also confirm this trend, and the thermal stability of
the adduct decreases in the following order: N-phenylnaphthylamine-TDI > d
iphenylamine-TDI = N-methylaniline-TDI. The gas chromatogram of the amine-b
locked isocyanate confirms that the thermolysis products are the blocking a
gent and isocyanate. The solubilities of the adducts were carried out in po
lyether, polyester, and hydrocarbon polyols, and it was found that the N-me
thylaniline-TDI adduct shows higher solubility than the rest and also found
that the polyester polyol shows higher salivating power against the adduct
s than the polyether and hydrocarbon polyols. (C) 1999 John Wiley & Sons, I
nc.