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以纳米碳酸钙(Nano-CaCO_3)和聚乳酸(PLA)为原料,马来酸酐接枝乙烯-辛烯共聚物(POE-g-MA)为增容剂,利用熔融挤出热拉-骤冷工艺制备了一系列Nano-CaCO_3/PLA复合材料。分别采用SEM、DSC、TG、毛细管流变仪(CR)和万能实验机研究了Nano-CaCO_3/PLA复合材料的界面相容性、热性能、流变性能与力学性能。结果表明:与纯PLA相比,当Nano-CaCO_3含量达到15wt%,Nano-CaCO_3/PLA复合材料团聚现象明显,其结晶度、最大热分解温度与拉伸强度分别下降1.9%、15.5℃与28.2%,弯曲强度和断裂伸长率分别提高37.5%和29.3%,而相应添加4wt%POE-g-MA增容剂的Nano-CaCO_3/PLA复合材料分散形态得到改善,其结晶度和拉伸强度分别下降4.2%和25.2%;最大热分解温度、弯曲强度和断裂伸长率分别提高5.8℃、25.3%和174.4%;同时POE-g-MA增加了Nano-CaCO_3/PLA复合材料的剪切黏度。
Using Nano-CaCO_3 and polylactic acid (PLA) as raw materials, maleic anhydride grafted ethylene-octene copolymer (POE-g-MA) A series of Nano-CaCO 3 / PLA composites were prepared by the process. The interfacial compatibility, thermal properties, rheological properties and mechanical properties of Nano-CaCO_3 / PLA composites were investigated by SEM, DSC, TG, capillary rheometer (CR) and universal testing machine. The results showed that Nano-CaCO 3 / PLA composite agglomerated significantly when the content of Nano-CaCO 3 was 15wt%, and its crystallinity, maximum thermal decomposition temperature and tensile strength decreased by 1.9%, 15.5 ℃ and 28.2 %, Flexural strength and elongation at break increased by 37.5% and 29.3%, respectively. However, the dispersion morphology of Nano-CaCO 3 / PLA composites with 4wt% POE-g-MA compatibilizer was improved. The crystallinity and tensile strength Respectively, decreased by 4.2% and 25.2% respectively. The maximum thermal decomposition temperature, flexural strength and elongation at break increased by 5.8 ℃, 25.3% and 174.4% respectively. POE-g-MA increased the shear viscosity of Nano-CaCO_3 / PLA composites .