Abstract:

This paper reports the effect of high-molecular-weight polyethylene (PE-HMW) on the crystal morphology of high-density polyethylene (PE-HD) specimen. The PE-HD specimen containing a small amount of PE-HMW prepared via dynamic packing injection molding was found to be obviously reinforced. The tensile strengths were increased from 28 MPa to 76 MPa in machine direction and to 32 MPa in transverse direction, the impact strength of them increased from 2.0×105 kJ/m2 to 8.7×105 kJ/m2 in machine direction. Electron microscopy micrograph indicated that there were abundant interlocking shish-kebab crystals present in shear layers. DSC confirmed the formation of central long shish structure and thickened kebabs which exhibit a higher thermal stability.

Key words: high-density polyethylene, high-molecular-weight polyethylene, crystal morphology, shish-kebab, dynamic packing