ArticlePolymers2026
Geometric Freezing of In-Situ Fibrillated PP/PA66 Composites via Low-Temperature Injection: Decoupling the Role of Draw Ratio and Compatibilization.
Article in Polymers, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Controlling fibril generation and retaining their morphology during secondary thermal processing remain critical challenges for in-situ microfibrillar composites. Herein, we propose a "melt blending-hot drawing-low-temperature injection" cascade strategy to fabricate polypropylene/polyamide 66 (PP/PA66) composites. By decoupling the synergistic effects of draw ratio (λ) and compatibilizer (PP-g-MAH), an optimal fibrillation window was identified (15 wt% PA66, 3 wt% compatibilizer, λ = 9), which balances interfacial tension and viscous drag to form a dense, oriented microfibrillar network. This solid-state network accelerates matrix nucleation (though slightly restricting overall crystallinity) and induces gel-like rheological behavior through severe structural confinement. Crucially, we demonstrate that conventional high-temperature injection (265 °C) triggers Rayleigh instability, causing fibril break-up and mechanical degradation. Conversely, low-temperature injection (210 °C) successfully achieves the "geometric freezing" of the metastable fibril network. Consequently, the optimal composite exhibits maximized static strength (45.3 MPa) and a continuous, significant leap in notch impact toughness (10.16 kJ/m
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