Synthesis and properties of aromatic secondary amine-blocked isocyanates

Citation
As. Nasar et al., Synthesis and properties of aromatic secondary amine-blocked isocyanates, J POL SC PC, 37(12), 1999, pp. 1815-1821
Citations number
24
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
ISSN journal
0887624X → ACNP
Volume
37
Issue
12
Year of publication
1999
Pages
1815 - 1821
Database
ISI
SICI code
0887-624X(19990615)37:12<1815:SAPOAS>2.0.ZU;2-0
Abstract
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.