Abstract
A core-shell particle was fabricated by grafting amino-terminated hyperbranched polymer to the surface of silica nanoparticles. The influences of core-shell particle contents on the tensile and impact strength of the epoxy thermosets modified with amino-terminated hyperbranched polymer were discussed in detail. For comparison, core-shell particle was added into the epoxy/polyamide system for toughness improvement. Results from tensile and impact tests are provided. The introduction of core-shell particle into the epoxy/polyamide systems just slightly enhanced the tensile and impact strength. The incorporation of 3 wt % core-shell particle could substantially improve the tensile and impact strength of epoxy/amino-terminated hyperbranched polymer thermosets. Field emission-scanning electron microscope images of the impact fracture surfaces showed that the excellent impact resistance of epoxy/amino-terminated hyperbranched polymer/core-shell particle thermosets may be attributed to the synergistic effect of shearing deformation and crack pinning/propagation, which is induced by the good compatibility between epoxy matrix and core-shell particle in the presence of amino-terminated hyperbranched polymer.
Highlights
Epoxy resins are a class of high-performance materials and widely used as a mechanical material, structural adhesive, molding compound, electronic materials, functional coating and advanced composite matrix [1,2,3] owing to their excellent engineering properties
The results indicated resistance of the epoxy thermosets modified with amino-terminated hyperbranched polymer (ATHBP) was investigated
The results indicated that the tensile and impact strength of the epoxy thermosets were dependent on the contents of core-shell particles (CSPs)
Summary
Epoxy resins are a class of high-performance materials and widely used as a mechanical material, structural adhesive, molding compound, electronic materials, functional coating and advanced composite matrix [1,2,3] owing to their excellent engineering properties. Epoxy thermosets present poor impact resistance because of their high cross-linking density. Besides modifying epoxy thermosets with rubbers, thermoplastic resins, and clay nanoparticles [4,5,6,7,8,9,10,11], it is usually considered that the addition of core-shell particles (CSPs) is an appropriate method to solve the poor impact resistance problem in epoxy resins [12,13,14,15,16,17]. One novel approach is to incorporate inorganic nanoparticles into polymers to form inorganic/organic core-shell nanoparticles These nanoparticles usually present excellent properties due to the synergistic effect of the unique mechanical performances from inorganic nanoparticles and varied functionality from organic polymers. CSPs were used to modify the epoxy/polyamide thermosets
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