文档介绍：Talanta 50 (1999) 283–290
Near infrared (NIR) spectroscopy for in-line monitoring of
polymer extrusion processes
Thomas Rohe *, Wolfgang Becker, Sabine Ko¨lle, Norbert Eisenreich,
Peter Eyerer
Fraunhofer-Institut fu¨r Chemische Technologie (ICT), Joseph-6on-Fraunhofer-Strasse 7, D-76327 Pfinztal-Berghausen, Germany
Received 7 September 1998; received in revised form 9 November 1998; accepted 10 November 1998
Abstract
In recent years, near infrared (NIR) spectroscopy has e an analytical tool frequently used in many chemical
production processes. In particular, on-line measurements are of interest to increase process stability and to document
constant product quality. Application to polymer processing . polymer extrusion, could even increase product
quality. Interesting parameters position of the processed polymer, moisture, or reaction status in reactive
extrusion. For this issue a transmission sensor was developed for application of NIR spectroscopy to extrusion
processes. This sensor includes fibre optic probes and a measuring cell to be adapted to various extruders for in-line
measurements. In contrast to infrared sensors, it only uses optical ponents. Extrusion processes at
temperatures up to 300°C and pressures up to 37 MPa have been investigated. Application of multivariate data
analysis (. partial least squares, PLS) demonstrated the performance