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以邻苯二甲酸酐(PA)增韧不饱和聚酯树脂(UPR),并与热塑性弹性体聚醋酸乙烯酯(PVAc)和无机增韧剂碳酸钙(CaCO3)增韧改性的UPR样品进行比较.通过力学性能测试、红外和电镜分析对样品的性能进行了研究.结果表明:UPR和PA反应生成邻苯二甲酸酯类化合物,微观结构中裂纹偏转和裂纹扩展转变为韧窝,使得PA对UPR的增韧作用优于PVAc和CaCO3.PA质量分数为5％的UPR固化样品的冲击强度达到最大值(7.91±0.1) kJ/m2,较纯UPR固化样品的冲击强度提高了83％.“,”The unsaturated polyester resin(UPR)was toughened by phthalic anhydride (PA)and compared with the UPR sample toughened with thermoplastic elastomer PVAc and inorganic toughening agent CaCO3,respectively.The properties of the toughened UPR sample were investigated by the mechanical property tests,FTIR and SEM analysis.The results showed that phthalate esters were obtained by the reaction of UPR and PA.The crack deflection and crack propagation in the microstructures were turned into dimples,so that the toughening effect of PA on UPR was better than those of PVAc and CaCO3.The breaking strength of the UPR cured sample with 5％ PA reached the maximum(7.91 ± 0.1) kJ/m2 and improved by 83％ compared with that of pure UPR cured sample.