E. Klemm, Cornelia Stöckl
1991
Citations
0
Influential Citations
23
Citations
Journal
Macromolecular Chemistry and Physics
Abstract
The addition reaction of 3,6-dioxaoctane-1,8-dithiol with various diisocyanates, proceeding by addition of 1,4-diazabicyclo[2.2.2.]octane as basic catalyst, was investigated. That way, NCO-and SH-terminated linear thiocarbamate telechelics (containing NHCOS-groups) were synthesized. The structures were evaluated by IR and 13C NMR spectroscopy. Results show that side reactions of the NH protons with isocyanate (forming allophanates) can be excluded. The NCO-terminated prepolymers are suitable to be used as participants in common isocyanate reactions. Thus, by treating with allyl alcohol, 2-hydroxyethyl methacrylate or diallylamine, they can be transformed into telechelics with olefinic end-groups (5, 6, 7). The products were characterized by their number-average mol. wts. (VPO) and elemental analysis, and the expected chemical structures were confirmed by characteristic absorption bands.