HDPE/E-TMB共混物和HDPE/弹性体共混物的脆韧转变和断面形态

The Brittle-Ductile Transition and Impact Fracture Surface Morphology of HDPE/E-TMB Blends and HDPE/Elastomer Blends

用材料力学性能测试方法和扫描电镜研究了HDPE/E-TMB共混物和HDPE/弹性体共混物的脆韧转变行为和冲击断面形态。结果表明,HDPE/E-TMB共混物的脆韧转变可在弹性体含量较低的情况下发生;弹性体含量相同时,HDPE/E-TMB共混物有更高的冲击强度和拉伸屈服应力;冲击强度相同时,HDPE/E-TMB共混物有更高的拉伸屈服应力和弯曲弹性模量。弹性体含量为8%的两种共混物的冲击断面形态属于不同的断裂机理,这种机理的不同揭示了HDPE/E-TMB共混物具有特殊的结构特征。

The brittle-ductile transition and impact fracture surface morphology of HI）PE/E-TMB （HDPE - toughening master batch） blends and HDPE/elastomer blends were studied by material universal testing machine and scanning electron microscope. The results show that brittle-ductile transition of HDPE/E-TMB blends occurs at lower elastomer content. The notched impact strength and the tensile yield stress are higher than those of HDPE/ elastomer blends at the same elastomer content. The tensile yield stress and the flexural modulus are higher than those of HDPE/elastomer blends at the same notched impact strength. There is different rupture mechanics in HDPE/E-TMB blends and HDPE/elastomer blends at the elastomer content is 8%. It reveals that the special structure exists in the HDPE/E-TMB blends.