Abstract
New aromatic poly(diazetidinediones) having a strained four-membered heterocyclic ring structure, which we were unable to obtain by the polymerization under atmospheric pressure, were synthesized for the first time by the cyclodimerization polymerization of aromatic diisocyanates under high pressure without use of solvent or catalyst. As shown by a model compound study, aromatic monoisocyanates cyclodimerized almost quantitatively, yielding 1,3-disubstituted 1,3-diazetidine-2,4-diones at 180-200°C under 400-800 MPa for 20-40 h. Aromatic diisocyanates were converted cleanly to poly(diazetidinediones) through the cyclodimerization polymerization at 200°C under 700 MPa for 20 h
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