聚甲醛/弹性体/纳米碳酸钙复合材料的制备及性能研究

采用双螺杆熔融共混的方法，以4种不同的混合顺序，制备了聚甲醛/热塑性聚氨酯弹性体/纳米碳酸钙（POM/TPU/nano-CaCO3）复合材料。通过力学性能测试、偏光显微镜、差示扫描量热仪、熔体流动速率仪和扫描电子显微镜，考察了nano-CaCO3的用量对POM/TPU(90/10)复合材料力学性能的影响，并探讨了共混方式对复合材料力学性能及微观结构形态的影响。结果表明，4 %的nano-CaCO3与TPU预先混合制成母粒再与POM共混得到的复合材料中POM晶粒发生明显细化，缺口冲击强度高达12.5 kJ/m2，冲击性能较为优异。

Preparation and Properties of POM/Elastomer/Nano-CaCO3 Composites

Polyoxymethylene (POM)/thermoplastic polyurethane elastomer (TPU)/nano calcium carbonate (nano-CaCO3) composite materials were prepared by melt compounding with four different mixing sequences. Through mechanical property testing, polarizing microscope(PLM), differential scanning calorimetry(DSC), melt flow rate, and scanning electron microscope (SEM), the effects of different dosages of nano-CaCO3 and blending methods on the mechanical properties and microstructure morphology of the composites were investigated. Premixing TPU with 4 % nano-CaCO3，the composites exhibited excellent impact resistance. The measured notched Izod impact strength was near 12.5 kJ/m2.