In this work, mass transfer kinetics of CO₂ and eugenol into polyamide 6 (PA6) fibers under supercritical conditions were investigated in the context of the development of a functional dental floss for dental care applications using scCO₂-assisted impregnation. The sorption kinetics was evaluated at different temperature (40 and 60 °C) and pressure conditions (10 and 12 MPa), measuring the total amount of CO₂ and eugenol incorporated in PA6 fibers after certain time intervals (from 30 min to 4 h). Equilibrium sorption was determined for all operation conditions, obtaining the highest values at low CO₂ density. Diffusion coefficients of CO₂ and eugenol under different process conditions were estimated fitting the experimental data with analytical solutions of the second Fick’s law. In addition, thermal behavior of eugenol-loaded PA6 fibers impregnated at different time intervals was evaluated by differential scanning calorimetry (DSC), observing only small changes in the polymer crystallinity during the high-pressure process.

在这项工作中，在开发使用scCO ₂辅助浸渍的牙科护理用功能性牙线的过程中，研究了超临界条件下CO ₂和丁子香酚向聚酰胺6（PA6）纤维中的传质动力学。在不同温度（40和60°C）和压力条件（10和12 MPa）下评估了吸附动力学，在一定时间间隔（30分钟至4小时）后测量了掺入PA6纤维中的CO ₂和丁子香酚的总量。确定所有操作条件下的平衡吸附，在低CO ₂密度下获得最大值。CO _2的扩散系数根据第二菲克定律的解析解估计实验数据，以估计不同工艺条件下的丁香酚和丁香酚。此外，通过差示扫描量热法（DSC）评估了在不同时间间隔浸渍丁香酚的PA6纤维的热行为，仅观察到高压过程中聚合物结晶度的微小变化。