PP/PB共混材料的力学及流变性能研究

采用哈克双螺杆挤出机制备了聚丙烯/聚丁烯-1(PP/PB)共混材料,考察了PB的熔体流动速率(MFR)和用量对PP流变性能和力学性能的影响。结果表明:PP与PB二者相容性良好,当PB质量分数为30%时,PP/PB200(MFR为200 g/10 min)共混材料的MFR最大为37.90 g/10 min,约是纯PP的4.15倍,PP/PB0.5(MFR为0.5 g/10 min)共混材料的MFR最小为7.59 g/10 min,与纯PB相比降低了16.87%;随着PB MFR的增加,PP/PB共混材料的熔体强度降低;当PB MFR为0.5 g/10 min时,对PP有明显的增强和增韧效果,PP/PB共混材料的拉伸强度为31.11 MPa,冲击强度为48.52 kJ/m^2,与纯PP相比分别提高了28.82%和185.24%。

Study on Mechanical Properties and Rheological Properties of Polypropylene/Polybutene-1 Blends

Polypropylene/Polybutene-1(PP/PB) blends were prepared by Haake twin-screw extruder. The effects of the melt flow rate(MFR) and content of PB on the rheological properties and mechanical properties of PP were investigated. The results show that PP and PB have good compatibility. When the mass fraction of PB is 30%, the MFR of PP/PB200(MFR is 200 g/10 min) blending material is 37.90 g/10 min, which is about 4.15 times of pure PP. The MFR of PP/PB0.5(MFR is 0.5 g/10 min) blendeds is 7.59 g/10 min, which is 16.87% lower than that of pure PB. The melt strength of the PP/PB blend decreases with the increase of PB MFR;when the PB MFR is 0.5 g/10 min, the PP has a significant strengthening and toughening effect. The tensile strength of PP/PB blends is 31.11 MPa, and the impact strength is 48.52 kJ/m^2, which is 28.82% and 185.24% higher than that of pure PP.