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Solid particles used to toughen polymer can induce shear bands and crazing to release the internal stress of polymer. Herein, SiO2 particles with different sizes were prepared by sol–gel method and modified by triethylenetetramine (TETA) in water. 1, 2, 3 and 4 wt% of SiO2 and SiO2‐TETA particles are used to toughen epoxy resin (EP). They can form chemical bond with EP to heighten polymer's storage...
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