Plastics reuse is essential for promoting a sustainable future, especially by miti-gating environmental impacts. Recycled polyamide 66 (PA66r) was reused forthe produce biopolyethylene (BioPE)-based blends, aiming to obtain a super-tough material. Initially, a premix of PA66r with maleic anhydride-graftedethylene–propylene–diene (EPDM-MA) was obtained in an internal mixer.Subsequently, the BioPE/PA66r and BioPE/(PA66r/EPDM-MA) blends wereprocessed in a twin-screw extruder and injection molded. The rheological,mechanical, thermal, thermomechanical, structural, and morphological prop-erties were investigated. Torque rheometry indicated an increase in the viscos-ity of the BioPE/(PA66r/EPDM-MA) blends compared to BioPE/PA66r, whichwas confirmed by a reduction in the melt flow index (MFI). EPDM-MA pro-moted greater stability in BioPE/(PA66r/EPDM-MA) blends during processing,reducing the degradation rate and molecular weight loss. The BioPE/(PA66r/EPDM-MA) blend with the 70/(15/15)% composition exhibited super-toughbehavior, with 822.4 J/m impact strength and 233% elongation at break. Scan-ning electron microscopy indicated a fracture with high plastic deformation,elongated fibrils, and refined particles (0.64 μm), confirming the high tough-ness. Apparently, a core-shell morphology was formed, which favored main-taining tensile strength, Shore D hardness, and heat deflection temperaturecomparable to pure BioPE. The results indicate potential for application in theautomotive industry, contributing to reintroducing recycled material into the production chain
Toward the production of bioblends for the automotive sector: Reuse of recycled polyamide 6,6 to prepare super-tough biopolyethylene
Lama G. C.;
2024
Abstract
Plastics reuse is essential for promoting a sustainable future, especially by miti-gating environmental impacts. Recycled polyamide 66 (PA66r) was reused forthe produce biopolyethylene (BioPE)-based blends, aiming to obtain a super-tough material. Initially, a premix of PA66r with maleic anhydride-graftedethylene–propylene–diene (EPDM-MA) was obtained in an internal mixer.Subsequently, the BioPE/PA66r and BioPE/(PA66r/EPDM-MA) blends wereprocessed in a twin-screw extruder and injection molded. The rheological,mechanical, thermal, thermomechanical, structural, and morphological prop-erties were investigated. Torque rheometry indicated an increase in the viscos-ity of the BioPE/(PA66r/EPDM-MA) blends compared to BioPE/PA66r, whichwas confirmed by a reduction in the melt flow index (MFI). EPDM-MA pro-moted greater stability in BioPE/(PA66r/EPDM-MA) blends during processing,reducing the degradation rate and molecular weight loss. The BioPE/(PA66r/EPDM-MA) blend with the 70/(15/15)% composition exhibited super-toughbehavior, with 822.4 J/m impact strength and 233% elongation at break. Scan-ning electron microscopy indicated a fracture with high plastic deformation,elongated fibrils, and refined particles (0.64 μm), confirming the high tough-ness. Apparently, a core-shell morphology was formed, which favored main-taining tensile strength, Shore D hardness, and heat deflection temperaturecomparable to pure BioPE. The results indicate potential for application in theautomotive industry, contributing to reintroducing recycled material into the production chainI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
