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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。
Polyethylene terephthalate (PET) oligomer was grafted on the surface of nano-ZrO2 by grafting polymerization to improve its compatibility with polycarbonate (PC). The modified nano-ZrO2 and PC Nano-ZrO2 / PC composites were prepared by extrusion. The grafted nanostructured ZrO2 was characterized by FTIR, XPS, TEM, TG, contact angle and other methods. The results showed that the PET was chemically bonded to the surface of ZrO2 nanocomposites, the hydrophobicity of ZrO2 was significantly enhanced, and the dispersion of microscopic particles was good . The mechanical properties of nano-ZrO2 / PC composites were tested, and the relationship between the addition of nano-ZrO2 and the mechanical properties of composites was discussed. The results show that the mechanical properties of nano-ZrO2 / PC composites are obviously improved compared with that of pure PC. With the increase of modified nano-ZrO2 content, both the notched impact strength and the tensile strength increase firstly and then decrease, 1% and 0.3% respectively. The flexural strength has been increasing in the experimental range, and the maximum flexural strength increased by 2.54 MPa compared with pure PC.