植物纤维与聚合物复合体系不适宜用毛细管流变仪测量流变性能.为此,文中建立一种利用转矩流变仪测量流变特性的方法,利用该方法表征了不同剑麻纤维质量分数下,聚丁二酸丁二醇酯（PBS）复合材料的流变性能,并测量实验后纤维的长径比,分析剑麻纤维质量分数和转速对复合材料中纤维长径比以及复合材料弯曲强度的影响.结果表明,由于纤维的解缠、断裂和取向,复合材料的剪切变稀现象随剑麻纤维质量分数的增加而更为明显.

As the capillary rheometer is not appropriate for measuring the rheological properties of the composites of plant fibers and polymers,a new measurement method using the torque rheometer was proposed and was then used to measure the rheological properties of polybuthylene succinate （ PBS） composites reinforced with sisal fibers （ SF） in different mass fractions. Then,the length-to-diameter ratio of sisal fibers in the composites was measured,and the effects of SF content and rotor speed on the length-to-diameter ratio of SF and the flexural strength of the composites were analyzed. The results show that the shear-thinning phenomenon of the composites becomes more significant with the increase in SF content due to the disentangling,breaking and orientation of SF.