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4810094 
Journal Article 
Relaxation spectrum of polyisocyanurate with terminal oxazolidone groups 
Kramarenko, VY; Privalko, VP 
2004 
1 
Polymer Science Series A
ISSN: 0965-545X
EISSN: 1555-6107 
46 
2 
143-150 
English 
WOS:000189290200009 
The characteristics of relaxation transitions in polyisocyanurate based on hexamethylene diisocyanate with terminal oxazolidone groups are studied using the method of dielectric relaxation spectroscopy in the 10(-1) to 10(5) Hz frequency range and in the 123 to 493 K temperature range. The relaxation spectrum is shown to be simplified as the chemical reactions reach a deeper degree of completion. The beta- and alpha-relaxation and conductivity parameters are analyzed using the Havriliak-Negami equation in various combinations. The effect of terminal oxazolidones is considered by comparing the results with the behavior of isocyanurate networks with a varying crosslink density and different ratios of heterocycles in the molecular structure.