The effect of core–shell particles on the mechanical performance of epoxy resins modified with hyperbranched polymers


A novel core–shell particle that consists of epoxide-terminated hyperbranched polymer (HBP) and silica nanoparticles was incorporated into an epoxy/hydroxyl-terminated HBP blend to fabricate a high-performance epoxy thermoset. The effect of the core–shell particle content on the mechanical properties of the epoxy thermosets was investigated in detail. Results from tensile, flexural, and impact tests are provided. The impact fracture surface was studied by field emission-scanning electron microscopy. The incorporation of 2 wt% core–shell particles improved the tensile strength, percent elongation at break, flexural strength, and impact resistance of epoxy/hydroxyl-terminated HBP thermosets. Field emission-scanning electron micrographs showed that core–shell particle addition resulted in large-scale shear deformation and debonding from the epoxy matrix, and improved the epoxy resin toughness.

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The authors gratefully acknowledge supports from the National Natural Science Foundation of China (51402251, 51578289, 51572234 and 51502259), the National Science and Technology Major Project of the Ministry of Science and Technology of China (2012ZX04010032), the joint research fund between Collaborative Innovation Center for Ecological Building Materials and Environmental Protection Equipments and Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province (CP201506 and GX2015107), the project funded by the Flagship Major Development of Jiangsu Higher Education Institutions (PPZY2015A025), and the Natural science fund of Jiangsu Province (BK20130428).

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Li, S., Lin, Q. & Cui, C. The effect of core–shell particles on the mechanical performance of epoxy resins modified with hyperbranched polymers. Journal of Materials Research 31, 1393–1402 (2016).

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