Toward the production of bioblends for the automotive sector: Reuse of recycled polyamide 6,6 to prepare super-tough biopolyethylene

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abstract

Plastics reuse is essential for promoting a sustainable future, especially by mitigating environmental impacts. Recycled polyamide 66 (PA66r) was reused for the produce biopolyethylene (BioPE)-based blends, aiming to obtain a super-tough material. Initially, a premix of PA66r with maleic anhydride-grafted ethylene-propylene-diene (EPDM-MA) was obtained in an internal mixer. Subsequently, the BioPE/PA66r and BioPE/(PA66r/EPDM-MA) blends were processed in a twin-screw extruder and injection molded. The rheological, mechanical, thermal, thermomechanical, structural, and morphological properties were investigated. Torque rheometry indicated an increase in the viscosity of the BioPE/(PA66r/EPDM-MA) blends compared to BioPE/PA66r, which was confirmed by a reduction in the melt flow index (MFI). EPDM-MA promoted 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-tough behavior, with 822.4 J/m impact strength and 233% elongation at break. Scanning electron microscopy indicated a fracture with high plastic deformation, elongated fibrils, and refined particles (0.64 mu m), confirming the high toughness. Apparently, a core-shell morphology was formed, which favored maintaining tensile strength, Shore D hardness, and heat deflection temperature comparable to pure BioPE. The results indicate potential for application in the automotive industry, contributing to reintroducing recycled material into the production chain. The reuse of polyamide 66 is viable for the production of super-tough biopolyethylene, using reactive processing in a twin-screw extruder. image

keywords

DYNAMIC-MECHANICAL PROPERTIES; HIGH-DENSITY POLYETHYLENE; POLYMER BLENDS; CHAIN EXTENSION; MORPHOLOGY; POLYPROPYLENE; DEGRADATION; COPOLYMER; COMPATIBILIZATION; PA6

subject category

Polymer Science

authors

Luna, CBB; Lama, GC; Costa, ARD; d'Ayala, GG; Wellen, RMR; Araújo, EM

our authors

foto Anna Raffaela de Matos

Anna Raffaela de Matos

Junior Researcher

Groups

G4 - Renewable Materials and Circular Economy

acknowledgements

CNPq, Grant/Award Numbers:350025/2023-1, 312014/2020-1, 303426/2021-7

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Publication Details

type
Journal Article
year
2024
journal
JOURNAL OF APPLIED POLYMER SCIENCE
volume
141
publisher
WILEY
issn
0021-8995
isbn
1097-4628
issue
44
digital object identifier
10.1002/app.56160
web of science article identifier
WOS:001291481800001

Journal Metrics (JCR 2019)

Journal Impact Factor
2.52
Journal Impact Factor (5 yrs)
2.257
category normalized journal percentile
64.607

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