Synergistic Compatibilization of LDPE/PS/PA6 Ternary Blends by Combining Reactive and Non‐Reactive Compatibilizers

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ABSTRACT Efficient recycling of mixed plastic waste remains challenging due to the intrinsic immiscibility of constituent polymers, which compromises mechanical performance. Here, a synergistic compatibilization strategy combining reactive maleic anhydride–grafted low‐density polyethylene (LDPE‐ g ‐MA) and non‐reactive styrene–ethylene–butadiene–styrene (SEBS) is demonstrated to enhance interfacial adhesion and mechanical properties of LDPE/PS/PA6 blends. The cooperative action of LDPE‐ g ‐MA and SEBS minimized mutual interference and improved compatibilization efficiency at both LDPE/PA6 and LDPE/PS interfaces. In the LDPE/PS/PA6 (40/30/30) blend, the bicontinuous LDPE/PS morphology with PA6 encapsulated in PS transformed into an LDPE matrix containing salami‐like core–shell domains with mixed PS/PA6 cores upon addition of 5 wt.% LDPE‐ g ‐MA and 5 wt.% SEBS. In the LDPE/PS/PA6 (70/15/15) blend, the PA6@PS domains evolved into distinct, refined salami‐like structures with inner PS cores and interfacial localized PA6 domains upon addition of 3 wt.% LDPE‐ g ‐MA and 3 wt.% SEBS, increasing notched impact strength from 3.3 to 18.2 kJ·m −2 . In the LDPE/PS/PA6 (15/15/70) blend, LDPE@PS core–shell domains converted to salami‐like PS@LDPE structures with 3 wt.% LDPE‐ g ‐MA and 4.5 wt.% SEBS, enhancing impact strength from 2.9 to 11.7 kJ·m −2 . This work offers an effective, industrially relevant route to tailor morphology and upgrade the performance of heterogeneous plastic waste toward sustainable recycling.

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