The present paper investigates the effect of strain rate on different tensile properties of high density polyethylene (HDPE) and polypropylene (PP) composite. Tensile specimens of virgin HDPE-PP composites are prepare...The present paper investigates the effect of strain rate on different tensile properties of high density polyethylene (HDPE) and polypropylene (PP) composite. Tensile specimens of virgin HDPE-PP composites are prepared via twin screw extruder and injection moulding methods as per ASTM D638-02a (Type-I);with gage length 50 mm, width 13 mm and thickness 3 mm. Composites are fabricated with PP as reinforcing agent at a loading rate of 10%, 20%, 30%, 40% and 50% by weight. Experiments are carried out at room temperature of 23°C and absolute humidity of 54% at a cross head speed of 30, 40, 50, 60 and 70 mm/min. Stress and strain values at yield and break points are reported. Atomic force microscopy (AFM) is used to study the distribution of polymer molecules in the mixture and surface roughness. As in last, experiments are designed by Taguchi optimization method to find out the dominating factors on tensile strength.展开更多
在熔体的流动过程中叠加脉动的压力振幅,研究了压力振动场对聚合物熔体的流动性能的影响。表观黏度随着压力振幅、振频的增加而明显下降,当压力振幅为29.7 M Pa时,高密度聚乙烯(HDPE)、聚丙烯(PP)和丙烯腈-丁二烯-苯乙烯共聚物(ABS)表...在熔体的流动过程中叠加脉动的压力振幅,研究了压力振动场对聚合物熔体的流动性能的影响。表观黏度随着压力振幅、振频的增加而明显下降,当压力振幅为29.7 M Pa时,高密度聚乙烯(HDPE)、聚丙烯(PP)和丙烯腈-丁二烯-苯乙烯共聚物(ABS)表观黏度最大的降低幅度分别为99%、99%和94.3%;随着振频的增加,黏度迅速下降,当振频大于0.70 H z之后,增加振频对黏度的影响不大,HDPE、PP和ABS表观黏度随振频增加而降低,幅度分别为48.9%、82.9%、66.7%,可见压力振动场能明显地改善聚合物熔体的流动行为。展开更多
文摘The present paper investigates the effect of strain rate on different tensile properties of high density polyethylene (HDPE) and polypropylene (PP) composite. Tensile specimens of virgin HDPE-PP composites are prepared via twin screw extruder and injection moulding methods as per ASTM D638-02a (Type-I);with gage length 50 mm, width 13 mm and thickness 3 mm. Composites are fabricated with PP as reinforcing agent at a loading rate of 10%, 20%, 30%, 40% and 50% by weight. Experiments are carried out at room temperature of 23°C and absolute humidity of 54% at a cross head speed of 30, 40, 50, 60 and 70 mm/min. Stress and strain values at yield and break points are reported. Atomic force microscopy (AFM) is used to study the distribution of polymer molecules in the mixture and surface roughness. As in last, experiments are designed by Taguchi optimization method to find out the dominating factors on tensile strength.
文摘在熔体的流动过程中叠加脉动的压力振幅,研究了压力振动场对聚合物熔体的流动性能的影响。表观黏度随着压力振幅、振频的增加而明显下降,当压力振幅为29.7 M Pa时,高密度聚乙烯(HDPE)、聚丙烯(PP)和丙烯腈-丁二烯-苯乙烯共聚物(ABS)表观黏度最大的降低幅度分别为99%、99%和94.3%;随着振频的增加,黏度迅速下降,当振频大于0.70 H z之后,增加振频对黏度的影响不大,HDPE、PP和ABS表观黏度随振频增加而降低,幅度分别为48.9%、82.9%、66.7%,可见压力振动场能明显地改善聚合物熔体的流动行为。
