Infrared process control on molten polymers using a high-pressure, high-temperature flow cell

Stengler, R.; Weis, G.

doi:10.1117/12.22310

Cited by 2 publications

(1 citation statement)

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“…With a gear pump, a small fraction of the melt was drawn continuously to a process spectrometer [66,67] equipped with a special transmittance measurement cell of adjustable path length [68]. Application of similar online instrumentation is described in [6,69,70]. In [70], in-line FT-IR was tested also to monitor the copolymerization of the styrene-maleic-anhydride model system with an alky-amine during melt extrusion.…”

Section: Extrusion Monitoring: Properties and Chemical Compositionmentioning

confidence: 99%

Monitoring of polymer melt processing

Alig

Steinhoff

Lellinger

2010

Meas. Sci. Technol.

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The paper reviews the state-of-the-art of in-line and on-line monitoring during polymer melt processing by compounding, extrusion and injection moulding. Different spectroscopic and scattering techniques as well as conductivity and viscosity measurements are reviewed and compared concerning their potential for different process applications. In addition to information on chemical composition and state of the process, the in situ detection of morphology, which is of specific interest for multiphase polymer systems such as polymer composites and polymer blends, is described in detail. For these systems, the product properties strongly depend on the phase or filler morphology created during processing. Examples for optical (UV/vis, NIR) and ultrasonic attenuation spectra recorded during extrusion are given, which were found to be sensitive to the chemical composition as well as to size and degree of dispersion of micro or nanofillers in the polymer matrix. By small-angle light scattering experiments, process-induced structures were detected in blends of incompatible polymers during compounding. Using conductivity measurements during extrusion, the influence of processing conditions on the electrical conductivity of polymer melts with conductive fillers (carbon black or carbon nanotubes) was monitored.

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