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在扩链剂Joncryl和增塑剂乙酰柠檬酸三丁酯存在下,采用微米级碳酸钙对聚乳酸(PLA)基体进行了高填充改性,制备碳酸钙高填充聚乳酸基复合材料,并用电子拉力机、扫描电镜、ARES流变仪等手段对材料的结构与性能等进行测试与表征。结果表明:碳酸钙高含量时可以明显提高材料的拉伸强度、弯曲强度,而材料的冲击强度会有所下降,但质量含量在30%～60%时复合材料的冲击强度仍高于纯聚乳酸。随碳酸钙含量的增加,材料的储能模量逐渐增大。碳酸钙的加入可以提高材料的弹性,材料的剪切黏度随剪切速率的增大而逐渐降低。
In the presence of chain extender Joncryl and plasticizer acetyl tributyl citrate, the polylactic acid (PLA) matrix was filled and modified with micron-sized calcium carbonate to prepare calcium carbonate highly filled polylactic acid matrix composites, Rally machine, scanning electron microscope, ARES rheometer and other means of material structure and performance testing and characterization. The results show that the tensile strength and flexural strength of the material can be obviously increased when the content of calcium carbonate is high, but the impact strength of the material is decreased. However, the impact strength of the composite material is still higher than that of the pure poly Lactic acid. With the increase of calcium carbonate content, the storage modulus of the material gradually increases. The addition of calcium carbonate can improve the elasticity of the material, the shear viscosity of the material decreases with increasing shear rate.