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<p>This study examines the unusually high impact strength observed in aliphatic polyketone (PK)/polyamide 6 (PA6) blends, which deviates positively from typical immiscible polymer behavior. While previous literature attributes this enhancement to partial miscibility caused by hydrogen bonding between the carbonyl groups of PK and the amide groups of PA6, the present study provides several evidence suggesting that cross-linking, not hydrogen bonding, is the primary mechanism. Two types of PA6 were used: standard PA6 (with –NH₂/–COOH end groups) and end-capped PA6 (ePA6, with –COOH/–COOH end groups). Both PK/PA6 and PK/ePA6 blends showed similarly fine morphologies, but only the PK/PA6 blend exhibited a strong positive deviation in impact strength. Additionally, the PK/PA6 blends appeared much darker in color compared to the lighter PK/ePA6 blends. When dissolved in solvent, the PK/PA6 samples left behind a substantial amount of gel-like, insoluble material, believed to be a cross-linked polymer. This residue was minimal in PK/ePA6 blends. Further, as melt-mixing time increased from 2 to 7&#xa0;min, the PK/PA6 samples became progressively darker, the amount of insoluble fraction increased from 0% to 48%, and the impact strength rose significantly from 129 to 493.3&#xa0;J/m, while domain size remained nearly unchanged. These findings indicate that the enhanced mechanical properties result from a chemical cross-linking reaction—likely involving the terminal –NH₂ group of PA6—with PK, rather than from hydrogen bonding. The absence of this behavior in the PK/ePA6 blend supports the conclusion that the –NH₂ end group plays a critical role in facilitating cross-linking and improving impact performance.</p>

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Effect of cross-linking reaction on the mechanical properties of aliphatic polyketone/polyamide 6 blend

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • Jeongyoun Park,
  • Younggon Son

摘要

This study examines the unusually high impact strength observed in aliphatic polyketone (PK)/polyamide 6 (PA6) blends, which deviates positively from typical immiscible polymer behavior. While previous literature attributes this enhancement to partial miscibility caused by hydrogen bonding between the carbonyl groups of PK and the amide groups of PA6, the present study provides several evidence suggesting that cross-linking, not hydrogen bonding, is the primary mechanism. Two types of PA6 were used: standard PA6 (with –NH₂/–COOH end groups) and end-capped PA6 (ePA6, with –COOH/–COOH end groups). Both PK/PA6 and PK/ePA6 blends showed similarly fine morphologies, but only the PK/PA6 blend exhibited a strong positive deviation in impact strength. Additionally, the PK/PA6 blends appeared much darker in color compared to the lighter PK/ePA6 blends. When dissolved in solvent, the PK/PA6 samples left behind a substantial amount of gel-like, insoluble material, believed to be a cross-linked polymer. This residue was minimal in PK/ePA6 blends. Further, as melt-mixing time increased from 2 to 7 min, the PK/PA6 samples became progressively darker, the amount of insoluble fraction increased from 0% to 48%, and the impact strength rose significantly from 129 to 493.3 J/m, while domain size remained nearly unchanged. These findings indicate that the enhanced mechanical properties result from a chemical cross-linking reaction—likely involving the terminal –NH₂ group of PA6—with PK, rather than from hydrogen bonding. The absence of this behavior in the PK/ePA6 blend supports the conclusion that the –NH₂ end group plays a critical role in facilitating cross-linking and improving impact performance.