PET接枝改性纳米ZrO2/PC复合材料的力学性能

采用接枝聚合反应在纳米ZrO₂表面接枝聚对苯二甲酸乙二醇酯 (PET) 低聚物，以提高其与聚碳酸酯(PC)的相容性；改性纳米ZrO₂与PC经过共混挤出，制备了纳米ZrO₂/PC复合材料。采用FTIR、XPS、TEM、TG、接触角等测试方法对接枝改性后的纳米ZrO₂进行了表征，结果表明，PET化学键合到了纳米ZrO₂表面，使ZrO₂疏水性显著增强，微观颗粒分散性好。对纳米ZrO₂/PC复合材料进行了力学性能测试，探讨了纳米ZrO₂的添加量与复合材料力学性能的关系。结果表明：纳米ZrO₂/PC复合材料的力学性能较纯PC有明显改善；随着改性纳米ZrO₂含量的增加，缺口冲击强度和拉伸强度都呈现出先增加后降低的趋势，分别在ZrO₂质量分数为1%和0.3%时达到最大值；弯曲强度在实验范围内一直呈上升趋势，最大弯曲强度比纯PC提高2.54 MPa。

PET graft modification of nano ZrO2 and the mechanical performance of nano ZrO2/PC composite

Nano ZrO2  was first modified with the poly(ethylene terephalate) prepolymer via polycondensation to increase its compatibility with PC. The nano ZrO2 /PC composite was successfully prepared by blending extrusion. The modified nano ZrO2 particles were characterized by FTIR，XPS，TEM，TG and contact angle test. The results show that the PET can be successfully combined to the surface of nano ZrO2 by the chemical bond， the hydrophobic property is improved and a good dispersibility is obtained. The mechanical performance of nano ZrO2 /PC composite was tested，  and the relationship with the content of nano ZrO2 was discussed. The results show that the mechanical performance of nano ZrO2 /PC composite is better than that of pure PC. The notch impact strength and the tensile strength of the composite first increase and then decrease with the addition of the nano ZrO2，and they reach the maximum respectively when the mass fraction of the nano ZrO2 is 1% and 0.3%. The flexural  stress of the composite is increased in the experimental range，and the maximum is 2.54 MPa higher than that of pure PC.