Morphologies And Properties Of Polyolefin Induced By Intensive Shear Stress And Small Amount Of High Molecular Weight Polyolefin

Polyolefin resins as a kind of most widely used polymers have received many attentions to their reinforcement and modification for a long time. More often, it is through new devices and new technologies to realize reinforcement and modification of polyolefin. The often-used methods include blending and filling modifications. For the former, engineering plastics are usually utilized to compound with polyolefin resins; and for the latter, inorganic particles and fiber are frequently used. However, they have some problems to solve, such as low adhesion strength of interfaces, poor fluidity, bad dispersing and reclaimability. So it is meaningful to modify common-used polyolefin resins by simple measures and devices with good performance.High-density polyethylene (HDPE) with high strength and toughness was obtained under the inducing of high molecular weight polyethylene (HMWPE) through dynamic packing injection molding (DPIM) technology in this work. The tensile strength of samples produced by DPIM along flow direction (MD) was increased by 235% compared to the samples obtained by static packing injection molding (SPIM) (i.e. conventional injection molding). The DPIM samples had ductile failure and an elongation of 150% at break during tensile test. Moreover, the tensile strength along transverse direction (TD) was also enhanced about 30% with a plastic failure. Compared with the maximum enhancement percentage 50% of...