Abstract: Amino-terminated polyaspartic polyurea (PUA) was prepared by the reaction of polyaspartic acid esters (PAEs) and isophorone diisocyanate (IPDI) first. Then PUA was blended with triethylenetetramine (TETA) in order to toughen the epoxy resin (EP). The structure of the synthesized PUA was analyzed by infrared spectroscopy, and the mechanical properties, thermal properties and section microstructure of the PUA toughening modified EP composite were characterized and analyzed by universal electronic testing machine, cantilever impact tester, differential scanning calorimeter (DSC) and scanning electron microscope (SEM). It could be found from the results that PUA was successfully synthesized by the proposed method. When the addition amount of PUA was 55 parts per hundred, the tensile strength of the material was 25.8 MPa. Meanwhile, the elongation at break was 22.6%, the shear strength of PUA toughened EP composites was 17.1 MPa, the impact strength of PUA toughened EP composites was 29.1 kJ/m2, which were about 4 times, 2.6 times and 3.3 times higher than that of pure EP, respectively. When the addition amount of PUA was 60 parts per hundred, the microstructure of PUA/EP composites presented obvious separated phase “sea-island” structure.
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2019, Vol. 33 
