The nanocomposites of polylactic acid (PLA)/S1–AMB (containing nano-ZnO and chlorophyll acid)/citric acid three butyl ester (TBC) and PLA/S2–AMB(only containing nano-ZnO )/TBC were achieved by thermal mechanical blending with self-made antibacterial masterbatch (S1–AMB or S2–AMB),PLA and TBC. The effects of different contents of nano-ZnO on the antibacterial effects and the mechanical properties of the two kinds of nanocomposites were researched. The results indicate that the antibacterial properties and elongation at break of the PLA/S1–AMB/TBC were greatly improve after adding a small amount of CCA. When the mass ratio of nano-ZnO/CCA is 18/6 and the mass fraction of nano-ZnO is 1.2%,the antibacterial rate of the composite is 99.5%,it is strong antibacterial material. Compared with PLA/S2–AMB/TBC,the elongation at break increased by 17.8 times and was 16.4 times of pure PLA,the retention rates of the impact strength,bending strength and tensile strength are 76.0%,85.8%,92.0% respectively. Without CCA,the antibacterial rate of PLA/S2–AMB/TBC is only 4.2%,which does not have antibacterial properties.%用自制抗菌母料S1–AMB [含nano-ZnO和叶绿素酮酸(CCA)]和S2–AMB (只含nano-ZnO)分别与聚乳酸(PLA),柠檬酸三丁酯(TBC)热机械共混制得PLA/S1–AMB/TBC和PLA/S2–AMB/TBC纳米复合抗菌材料.对比研究了不同nano-ZnO含量的两类复合材料对大肠杆菌抗菌性能和力学性能的影响.结果表明,CCA的加入使PLA/S1–AMB/TBC复合材料的抗菌性能和断裂伸长率大幅度提高;当nano-ZnO/CCA质量比为18/6,nano-ZnO质量分数为1.2%时,复合材料的抗菌率达到99.5%,为强抗菌材料;和PLA/S2–AMB/TBC相比,其断裂伸长率提高17.8倍,是纯PLA的16.4倍;缺口冲击强度、弯曲强度和拉伸强度保留率分别为76.0%,85.8%,92.0%;不加CCA时,PLA/S2–AMB/TBC的抗菌率仅为4.2%,不具备抗菌性能.
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