Monitoring the Curing of a Two-Component Adhesive using Raman Spectroscopy

Raman spectroscopy provides a fast and easy way to monitor the curing of a polymer-based adhesive in-situ. This report illustrates how the Cora 5001 Raman spectrometer can be used to reveal chemical changes occurring during the reaction.

This report demonstrates how Anton Paar’s compact benchtop Raman spectrometer Cora 5001 can be used to follow the progression of a chemical curing reaction.

Traditional design and analysis tools focus on measurement of physical properties (e.g. rheometry, viscometry, or ultrasonic inspection). However, assigning the measured macroscopic changes in physical properties to underlying chemical processes is often difficult and time-consuming. The industry standard method for measuring chemical reactions during polymer curing is differential scanning calorimetry (DSC), which is a fairly slow and labor-intensive procedure.

Raman spectroscopy offers a fast and direct method to gain chemical information on the sample and has been shown to produce results comparable to DSC measurements. As it is also a non-destructive technique, it can be used to follow a curing reaction live and in-situ. The Raman spectra provide a unique fingerprint of functional groups and the chemical backbone structure of the components in the applied adhesive mixture, and will clearly show changes due to the chemical reaction. The measured data can be used to determine important properties such as reaction velocity, pot life, and curing times, or the presence of intermediate or by-product species. 

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