Improved Thermal and Mechanical Properties of Epoxy Networks with Polyurethane Using Polyhedral oligomeric silsesquioxane (POSS) as Crosslinking Agent.
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초록
내용
Epoxy resins, one of the thermosetting plastics, have excellent thermal and mechanical properties. However, high degree of cross-linking after curing causes high internal stress and poor impact resistance, of epoxy resins. To improve these problems, and to increase thermal stability and impact resistance, polyhedral oligomeric silsesquioxane (POSS) and polyurethane were introduced in epoxy system. In this study, octa-aminophenyl POSS, with eight end groups of NH2, was used as curing agent in the polyurethane/epoxy network. Polyurethane, having excellent elasticity, flexibility, and high strength, was synthesized by urethane reaction of aliphatic and aromatic diisocyanate with polyether glycol. Finally, structure, thermal stability, mechanical properties of epoxy networks with polyurethane and POSS were analyzed using FT-IR, H-NMR, TGA, tensile test, flexure test, and impact test.