Determination of polymer end and functional groups by NIR spectrometry

摘要

The knowledge of accurate hydroxyl and acid numbers as well as water content is of great value for process control and quality assurance in the polymer industry. Standard methods are lengthy procedures and require large quantities of chemicals. Therefore rapid and simple spectrometric determinations are preferable. Especially near-infrared spectrometry in combination with chemometric methods offers some distinct advantages for such applications. The properties of polyesters derived by principal components regression (PCR) are compared to results obtained from well-accepted standard methods. Good correlations are achieved for OH and COOH numbers and weaker, but still useful, correlations are also achieved for water content. Thus PCR of near- infrared spectra offers the potential to replace other methods of investigation that are time-consuming and expensive.