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中文摘要：
利用高压毛细管流变仪测量的第一法向应力差（N1）和挤出胀大比（B）研究了纳米CaCO3和微米CaCO3分别填充和同时填充聚丙烯（PP）体系的熔体弹性。对纳米CaCO3或微米CaCO3单独填充PP体系，N1和B随着剪切速率的增加呈非线性上升趋势；随着CaCO3含量的增加，体系的N1和B先减小后增加；在一固定的剪切速率下，纳米CaCO3填充PP的N1高于微米CaCO3填充体系的，但不同粒径的微米CaCO3填充PP体系的N1差别不大。对纳米CaCO3和微米CaCO3同时填充PP体系。当CaCO3总质量分数不高而微米CaCO3与纳米CaCO3的质量比不超过1：1时，体系的N1与纳米CaCO3单独填充PP体系相比有显著下降，但与微米CaCO3单独填充PP体系相比。下降不明显。
英文摘要：
The melt elasticity of PP filled with CaCO3 of nano-particles or micron particles or their assembling was studied by capillary rheometry measuring the values of first normal stress difference（N1） and extrudate swell（B） of the systems. For PP filled with nanoparticles or micron particles respectively, the N1 and B of all composites mounted up nonlinearly with the increase of shear rate, and firstly decreased with the addition of CaCO3 but then increased with increasing the content. At a fixed shear rate, the N1 of PP filled with nano particles was higher than that of PP filled with micron particles. But for PP filled simultaneously with micron particles of different size, the difference of N1 was slight . For PP filled with CaCO3 of nano-particles and micron particles, when the fillers mass content was not high and the mass ratio of micron particles to nano-particles was not greater than 1.1, the N1 had notable decrease comparing to PP filled with nano-particles but was not distinct compared with PP filled with micron particles.
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