The diffusive behavior of dye molecules in a polymer were typically observed during the impregnation of the dye in a polymer, and this method combines phenomena that occurs in both the fluid and polymer phases. However, the dissolution of the dye in a fluid can cause inadequate resistance in the overall mass transfer, leading to errors in observing the diffusion behavior. Thus, in this study, we proposed an extraction-based diffusion coefficient measurement method that fundamentally minimizes errors in the dissolution process. The new methodology based on extraction can be utilized more easily without the consideration of the dissolution step. Moreover, the diffusion coefficients of dyes in polyester fibers were consistent with those determined by the WLF model over a range of temperatures and pressures. The extraction-based methodology can be easily utilized to measure the solute diffusion behavior in a glassy polymer or systems with slow dissolution rates.

通常在将染料浸渍到聚合物中的过程中观察到染料分子在聚合物中的扩散行为，并且该方法结合了在液相和聚合物相中均发生的现象。但是，染料在流体中的溶解会导致整体传质中的阻力不足，从而导致观察扩散行为时出现错误。因此，在这项研究中，我们提出了一种基于提取的扩散系数测量方法，该方法从根本上最小化了溶出过程中的误差。无需考虑溶解步骤，可以更轻松地利用基于提取的新方法。此外，在温度和压力范围内，染料在聚酯纤维中的扩散系数与WLF模型确定的一致。