The self-enhancement of universal HDPE5000S and shish-kebab influence on slow crack growth were studied by using the self-designed and self-made dynamic packing injection molding(DPIM) equipment and slow crack growth monitor device. Testing results showed that dynamic samples engender lots of shish-kebab structure. Tensile strength of dynamic samples reaches to 98.7 MPa that is 4.08 times one(24.2 MPa) of static samples and increased 307.9% and realize polyethylene’s self-enhancement. The mainly reasons that tensile strength of dynamic samples is largely enhanced are that a great deal of interlocking shish-kebab structure is formed and crystallinity is raised together. When tension stress of dynamic sample was 1.83 times that of static sample, the time of slow crack growth of dynamic sample was 6.17 times that of static sample.To a large extent, the capability of dynamic sample’s resisting slow crack has something to do with the shish-kebab structure in it.
