Abstract
Highly heat-resistant networked polymers consisting of isocyanurate moieties have been developed based on cyclotrimerization of isocyanates. To the polymerization system using methylene diphenyl 4,4′-diisocyanate (MDI) as the main component, a series of aromatic monoisocyanates (p-tolylisocyanate, p-trifluoromethylphenylisocyanate, p-tert-butylphenylisocyanate, and p-butylphenylisocyanate) were added with varying feed ratio [MDI]0:[monoisocyanate]0 to achieve successful control of flexibility of thecorresponding networked polymers without serious deterioration of the thermal stability.
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