Structures and Properties of Cured Epoxide Resin Containing Isocyanuric Acidt

Cured epoxide resins were obtained by various curing conditions and an equivalent ratio of epoxide resin and isocyanuric acid in the presence of imidazole compound. The glass transition temperature and the electrical and mechan ical properties of the cured resins obtained were measured using a free decrement oscillation method, an electrometer and a tensile and flexual tester. The glass transition temperature of the cured resins depends on the curing conditions and the equivalent ratio of isocyanuric acid and epoxide resin. The infrared spectra of the cured resins show the existence of isocyanurate and 2-oxazolidinone rings in their chemical structure. The ratio of isocyanurate and 2-oxazolidinone rings depends on the curing conditions for the compounds rather than the equivalent ratio of isocyanuric acid and epoxide resin. The glass transition temperature of the cured resin having isocyanurate rings was higher than that of the cured resin having 2-oxazolidinone rings. The volume resistivity, bending strength, and modulus and shear strength of the cured resins were superior to those of epoxide resin polymerized with 2, 4-diamino-6-[2-(2-methyl-1imidazoly)pethyl]-1, 3, 5-triazine under the same curing conditions.