Adams Alina, Kwamen Rance, Woldt Benjamin, Graß Michael
Institut für Technische und Makromolekulare Chemie, RWTH Aachen University, Templergraben 55, D-52056, Aachen, Germany.
Evonik Industries AG, Paul-Baumann-Straße 1, D-45772, Marl, Germany.
Macromol Rapid Commun. 2015 Dec;36(24):2171-5. doi: 10.1002/marc.201500409. Epub 2015 Oct 6.
The properties of plasticized poly(vinyl chloride) (PVC) , one of the most important polymers today, are strongly dictated by the concentration of plasticizer. Yet, it has been impossible to quantify this concentration at different positions inside a PVC product without its destruction because of a lack of suitable analytical methods. Thus, this paper introduces a simple, fast, and efficient way to determine truly nondestructively the concentration of plasticizer in PVC by single-sided nuclear magnetic resonance (NMR). With the help of correlation curves between the concentration of plasticizer inside nonaged PVC samples and the corresponding volume-averaged NMR parameters, single-sided NMR allows the quantification of the local concentration of plasticizer in aged PVC plates at different depths by spatially resolved relaxation measurements. The presented approach represents a fundamental step toward in situ characterization of plasticized PVC.
增塑聚氯乙烯（PVC）是当今最重要的聚合物之一，其性能在很大程度上取决于增塑剂的浓度。然而，由于缺乏合适的分析方法，在不破坏PVC产品的情况下，无法量化其内部不同位置的增塑剂浓度。因此，本文介绍了一种简单、快速且高效的方法，通过单面核磁共振（NMR）真正无损地测定PVC中增塑剂的浓度。借助未老化PVC样品中增塑剂浓度与相应体积平均NMR参数之间的相关曲线，单面NMR可通过空间分辨弛豫测量来量化老化PVC板中不同深度处增塑剂的局部浓度。所提出的方法是朝着增塑PVC原位表征迈出的重要一步。
