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Self-assembling β nucleating agents (TMB-5) and self-designed rotation extrusion device were applied to optimize and control over hoop strength of polypropylene (PP) pipes. By adjusting final heating temperature, TMB-5 efficiently self-assembled into fibrous morphology with controllable aspect ratio, and acted as an oriented template to direct the epitaxial crystallization of PP, into β-crystals with...
Slow crack growth (SCG) is one failure principal mode in polyethylene (PE) pressure pipe applications. In the conventional extrusion process, the molecular chains in the plastic pipes are oriented along the axial direction, which are disadvantageous to their resistance to SCG. In order to change the orientation direction of molecules in the plastic pipe, a new rotation extrusion processing system...
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