Faculty of Physics and Material Sciences Center, Philipps-Universität Marburg , Renthof 5, 35032 Marburg, Germany.
Institut für Technische und Makromolekulare Chemie, RWTH Aachen University , Templergraben 55, D-52056 Aachen, Germany.
Anal Chem. 2018 Feb 20;90(4):2409-2413. doi: 10.1021/acs.analchem.7b04548. Epub 2018 Feb 8.
Poly(vinyl chloride) (PVC) is today one of the most important commodity polymers. Its broad range of applications is due to the presence of plasticizers whose concentration largely impacts the microscopic and the macroscopic properties. Quantifying the concentration of plasticizer in PVC products is therefore of fundamental importance. Thus, in this paper, the applicability of terahertz (THz) time-domain spectroscopy for the characterization of plasticized PVC is for the first time evaluated in a systematic way. It could be demonstrated that the method is able to distinguish between PVC samples with different types and concentrations of plasticizers. Furthermore, a simple, fast, and efficient method is introduced to quantify the concentration of plasticizer in PVC samples of known plasticizer type but different thermal histories. The presented results are of key importance due to the need of reliable noninvasive and nondestructive analytical methods which can deliver onsite information about the remaining plasticizer concentration inside PVC products. Furthermore, it is expected that the proposed approach can be easily extended to other plasticized polymers.
聚氯乙烯（PVC）是当今最重要的商品聚合物之一。其广泛的应用是由于存在增塑剂，其浓度在很大程度上影响微观和宏观性质。因此，定量测定 PVC 制品中的增塑剂浓度具有重要意义。本文首次以系统的方式评估了太赫兹（THz）时域光谱在塑化 PVC 表征中的适用性。结果表明，该方法能够区分不同类型和浓度增塑剂的 PVC 样品。此外，还引入了一种简单、快速、高效的方法，用于定量测定已知增塑剂类型但热历史不同的 PVC 样品中的增塑剂浓度。由于需要可靠的非侵入性和非破坏性分析方法，这些结果具有重要意义，这些方法可以提供有关 PVC 制品内部剩余增塑剂浓度的现场信息。此外，预计所提出的方法可以很容易地扩展到其他增塑聚合物。
