Structure and property evolutions of rPE-HD/rPET blending system via volume-pulsatile injection molding
In this study,high-density polyethylene(PE-HD)and polyethylene terephthalate(PET)as two common com-ponents of plastic wastes were employed as experimental materials.The mass ratios of PE-HD to PET were set to be 9/1,8/2 and 7/3.A screw extruder was used to repeat the melt regeneration,and the volume-pulsatile injection mold-ing method was used to prepare the reinforced/toughened hybrid recycled materials.The mechanical properties of the multi-recycled materials were significantly improved.The influence of injection molding method on the microstructure of the injection-molded samples was analyzed.The results indicated that the pulsatile stress field introduced by volume-pul-satile injection molding could improve the compatibility of the incompatible two phases effectively and induce the forma-tion of in-situ submicron-fibril of the minor phase and the change of crystal morphology.This contributes to the formation of interlinked hybrid shish-kebab structure.Mechanical test results indicated that when the PE-HD/PET mass ratio was set to be 9/1,the hybrid recycled material prepared by volume-pulsatile injection molding exhibited yield strength and im-pact toughness of 38.7 MPa and 165 kJ/m2,which were 54.8%and 3 675.7%higher than those of conventional injec-tion molded material.When the PE-HD/PET mass ratio was 7/3,the yield strength and impact toughness of the hybrid recycled material were 31.0 MPa and 11.6 kJ/m2,respectively,increased by 14.8%and 216.1%compared to those of conventional injection-molded material.
volume-pulsatile injection moldingphysical recyclinghigh-density polyethylenereinforcement and tougheningpulsatile stress field
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