Wettability of aromatic polyamides (aramids) was investigated after exposed to the binary system of 1-Butyl-3-methylimidazolium hexafluorophosphate and supercritical CO₂, which was performed at a pressure of 30 MPa for 60 min by varying the treatment temperature between 80 °C and 120 °C. Dynamic contact angle analysis for the original and treated aramids was conducted to determine the correlation between the surface treatment and the polymer wettability. It is confirmed that the water contact angles for aramids were reduced significantly from 139.8° to 83.0° in the supercritical CO₂-ionic liquid systems, and the hydrogen bonding structure between the amide linkages in aramids and the PF^¯₆ in [BMIM][PF₆] was proved to form, which is conducive to the improvement of wettability. SEM observations revealed more and more pleat-like wrinkles appeared on the surface of aramid, accompanied by the notable fiber swelling in the supercritical CO₂-ionic liquid systems. In addition, XRD and TG analysis indicated that the crystallinity and the maximum decomposition temperatures of aramids were decreased gradually with ionic liquid treatment while those of aramids were increased with the temperature rising by adding ionic liquid in supercritical CO₂. Overall, this proves to be an more effective and ecofriendly approach for aramid modification by supercritical CO₂-ionic liquid systems.

暴露于1-丁基-3-甲基咪唑鎓六氟磷酸盐和超临界CO ₂的二元体系后，研究芳香族聚酰胺（芳族聚酰胺）的润湿性，该过程在30 MPa的压力下通过在80°C之间变化处理温度进行60分钟和120°C。对原始和处理过的芳族聚酰胺进行动态接触角分析，以确定表面处理与聚合物润湿性之间的相关性。据证实，对于芳族聚酰胺的水接触角从显著139.8°的超临界CO降低到83.0° ₂ -ionic液体系统，和酰胺键之间的芳族聚酰胺和PF的氢键结构^¯ ₆在[BMIM] [ PF ₆被证明形成了[α]，这有利于提高润湿性。SEM观察表明，在芳族聚酰胺表面上出现越来越多的褶状皱纹，并伴随着超临界CO ₂离子液体体系中明显的纤维溶胀。此外，XRD和TG分析表明，通过在超临界CO _2中添加离子液体，芳族聚酰胺的结晶度和最高分解温度随着离子液体处理而逐渐降低，而芳族聚酰胺的结晶度和最高分解温度随着温度的升高而升高。总体而言，这被证明是一种通过超临界CO ₂离子液体系统进行芳纶改性的更有效和环保的方法。