Application of microencapsulated unsaturated polyester toward temperature-triggered healing in epoxy composites

摘要: In this article, we demonstrate the potential of encapsulated unsaturated polyester resin toward introduction temperature-triggered healing functionality in a representative cycloaliphatic epoxy matrix. Unsaturated was poly(urea–formaldehyde) shell by dispersion polymerization technique which resulted formation free-flowing microcapsules (diameter ∼130 ± 49 µm) with core content 58 4%. Calorimetric studies confirmed chemical activity resin, spontaneously polymerized presence free radical initiator, 2,2′-azobis(2-methylpropionitrile), at temperature as low 80°C. Temperature-triggered epoxy-microcapsule composites performed 110°C and efficiency quantified ratio impact strength healed virgin specimens. The found to increase increasing amount microcapsule formulation reached maximum (100 2%) 2...