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<p>Polyamides (PAs) are widely used in engineering plastics, films, and composite systems. In solution-cast PA films, structural characteristics during film formation are highly sensitive to processing conditions, particularly solvent evaporation, which in turn strongly influences film morphology and mechanical performance. In this study, we investigate the effect of solvent evaporation on polyamide 6 (PA6) films prepared using formic acid–based binary solvent systems. By employing co-solvents with different volatilities, we examine how evaporation behavior governs crystallization and morphology development, thereby revealing the conditions under which uniform dense structures or non-uniform porous morphologies are formed. These results provide insights into the broad range of mechanical properties observed in solution-processed polyamide materials.</p> Graphical abstract <p>Solvent evaporation behavior, controlled by binary solvent systems, regulates crystallization and morphological evolution in polyamide films, leading to structure-dependent mechanical properties.</p>

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Binary solvent effects on crystallization and mechanical properties of solution-cast polyamide 6 films

  • 期刊论文

  • 发表日期：

    2026年4月2日

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  • Yuli Nurul Maulida,
  • Seongwoo Yoo,
  • PilHo Huh,
  • Seong Il Yoo

摘要

Polyamides (PAs) are widely used in engineering plastics, films, and composite systems. In solution-cast PA films, structural characteristics during film formation are highly sensitive to processing conditions, particularly solvent evaporation, which in turn strongly influences film morphology and mechanical performance. In this study, we investigate the effect of solvent evaporation on polyamide 6 (PA6) films prepared using formic acid–based binary solvent systems. By employing co-solvents with different volatilities, we examine how evaporation behavior governs crystallization and morphology development, thereby revealing the conditions under which uniform dense structures or non-uniform porous morphologies are formed. These results provide insights into the broad range of mechanical properties observed in solution-processed polyamide materials.

Graphical abstract

Solvent evaporation behavior, controlled by binary solvent systems, regulates crystallization and morphological evolution in polyamide films, leading to structure-dependent mechanical properties.