【摘要】 研究了振动频率、振动压力对等规聚丙烯/高密度聚乙烯(IPP/HDPE)共混物力学性能和凝聚态结构的影响。结果表明,与未施加振动的静态试样相比,振动试样的力学性能得到提高。随着振动压力的提高,低频率振动试样的力学性能呈明显上升趋势;振动频率对低振动压力试样的力学性能影响较小。在试样的表层及次表层,聚合物晶体沿熔体流动方向均有明显的取向。而对于试样芯层,则只有在成型温度为190℃、振动频率为0.23 Hz、振动压力为90 MPa的条件下才能观察到明显的晶体取向。更多还原

【Abstract】 Effects of vibration frequency and vibration pressure on the mechanical properties and morphology structure of IPP/HDPE blends were studied.The results showed that the mechanical properties of vibration samples were much higher than those of static samples.With increasing of vibration pressure,the mechanical properties of low-frequency vibration samples rose obviously.The effect of vibration frequency on mechanical properties was relatively less.The polymer crystals in surface and subsurface of sample oriented obviously along the flowing direction while for the core of samples,the polymer crystals oriented under certain conditions(T=190℃,f=0.23 Hz,P=90 MPa).更多还原