Formation of the polyisocyanurate networks structure
The reactions of PCT and CPCT of aliphatic isocyanates in the presence of catalysts HBSO and CN-DMSO were found to obey the first-order law. The observed rate constants at various temperatures and catalyst concentrations, the activation energy were determined. It was shown that in the PCT process with above catalysts practically only one type of a cyclic structure (isocyanurate) was formed. The HMDI PCT gives a highly cross-links polymer, the cross-links density of a network being equal to υ = 26×10 -4 > mol cm 3 >. In CPCT the polyisocyanurates with various cross-links density of a polymer network were obtained. At different ratios of mono- and diisocyanate the molecular-mass parameters of the interunit chains were determined, their effect on physico-mechanical properties of polyisocyanurates was established.(Author abstract)
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