文档介绍：New Developments in Process Control by
Spectroscopic Methods in the Polymer and
Plastics Industry –
Near Infrared Miniature Spectrometer and High
Temperature and Pressure Near Infrared and
Raman probes
D. Fischer, E. Pigorsch
Institute of Polymer Research, Hohe Str. 6, 01069 Dresden, Germany
1. Introduction
In recent years, real time monitoring of chemical reactions and product streams has e
more and more important in the polymer and plastics industry. This is due to the growing
economic and legislative demands on product quality and the environmental protection. The
industry needs rapid, reliable, non-invasive and cost effective analytical methods for process
control. Spectroscopic techniques can meet these demands. Vibrational spectroscopy is
ideally suited to qualitative analysis of starting materials and end products and to
quantification of polymer mixtures. Spectroscopic methods can also give valuable
information at the molecular level about the extent of polymerisation reactions and the quality
of the produced polymer.
Recent developments of modern fiber-optic-based spectrometers, especially for the near
infrared and Raman spectroscopy, opened up new perspectives for process analysis in the
polymer and plastics industry. The use of probes connected to spectrometer via optical fibers
allows direct measurements in the product stream without interference in the production
process.
This article gives an overview of the use of the vibrational spectroscopy techniques, near
infrared (NIR) and Raman, for process control in the polymer and plastics industry.
2. Polymer and plastics industry
1
Plastics are among the most extensively used modern engineering materials. They are used in
various applications in the automotive industry, in construction, in electronics, in packaging
and others (see Figure 1). The demand on polymers and plastics has been contineously
growing since 1950 only disturbed by the