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环氧树脂(EP)具有粘接力强、电绝缘性好、稳定性高和固化收缩率小等优点,但由于纯EP固化后呈三维交联网状结构,导致其内应力大、质脆和抗冲击韧性较差。采用共混法将纳米SiO2(nano-SiO2)加入到EP基体树脂中,制备nano-SiO2/EP复合材料。结果表明:复合材料的剪切强度由16.66 MPa升至18.01 MPa,冲击强度从15.40 kJ/m2升至33.68 kJ/m2,弯曲强度从70.50 MPa升至85.94 MPa,最终nano-SiO2/EP复合材料体系的韧性比不含nano-SiO2体系提高了82.8%。
Epoxy resin (EP) has the advantages of strong adhesion, good electrical insulation, high stability and low curing shrinkage rate. However, due to the three-dimensional crosslinked network structure after EP curing, the epoxy resin has large internal stress and brittleness Impact toughness is poor. Nano-SiO2 / EP composites were prepared by blending nano-SiO2 into EP matrix resin. The results showed that the shear strength of the composites increased from 16.66 MPa to 18.01 MPa, the impact strength increased from 15.40 kJ / m2 to 33.68 kJ / m2 and the flexural strength increased from 70.50 MPa to 85.94 MPa. The final nano-SiO2 / EP composite system Toughness than the non-nano-SiO2 system increased by 82.8%.