利用两步酯化法合成新型醚酯增塑剂——柠檬酸三(三甘醇单丁酯)酯(TTBC),通过红外光谱(FT-IR)和核磁共振氢谱(1H-NMR)对其进行表征,将聚乳酸(PLA)和TTBC按一定质量比进行熔融共混.采用差示扫描量热仪(DSC)、偏光显微镜(POM)、电子拉力机以及平行平板流变仪研究了不同含量的TTBC对PLA/TTBC性能的影响.结果表明:随着TTBC含量增加,PLA的玻璃化转变温度(Tg)、熔点(Tm)和冷结晶温度(Toc)均逐渐向低温移动,邵氏D硬度逐渐降低.PLA/TTBC的断裂伸长率均在300％以上,拉伸强度保持在10MPa以上.PLA/TTBC的复数黏度(矿)和黏流活化能(△Eη)显著下降.通过与增塑剂含量为25％(质量分数)的PLA/TBC对比发现,TTBC的增塑效率与耐迁移性均高于TBC.
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