On-Line FTIR Measurement Of The DEG-Content In Molten PETP Using A High Pressure, High Temperature Flow Cell.

Stengler, R.; Weis, G.

doi:10.1117/12.969585

Cited by 3 publications

(4 citation statements)

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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].…”

Section: Extrusion Monitoring: Properties and Chemical Compositionmentioning

confidence: 99%

“…Despite the fact that FT-IR delivers detailed vibrational spectra which usually can be well correlated with the chemical composition, the method has several drawbacks. Strongly absorbing melts require the path length to be as small as 50 μm for FT-IR transmission measurement [66]. Thus, these measurements are mainly restricted to on-line configurations using a bypass.…”

Section: Extrusion Monitoring: Properties and Chemical Compositionmentioning

confidence: 99%

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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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Section: Extrusion Monitoring: Properties and Chemical Compositionmentioning

confidence: 99%

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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“…[12 -16] Also, an on-line system for FTIR measurements in the mid-infrared (MIR) region using a by-pass system was described. [17,18] In this paper the attenuated total reflectance (ATR)-FTIR spectroscopy in the mid-infrared was used to analyze the monomer/polymer ratio during the polymerization process. The in-line measurements were performed using a high temperature and high pressure resistant dipping probe with a conical two-reflection ZnSe ATR crystal.…”

Section: Conversion and Temperature Measurementmentioning

confidence: 99%

Real-Time Monitoring of Reactive Extrusion Processes by Means of In-Line Infrared Spectroscopy and Infrared Temperature Measurement

Haberstroh¹,

Jakisch

Henssge

et al. 2002

Macromol. Mater. Eng.

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“…Common applications of on-line mid-IR spectroscopy in the range from 4000 to 400 cm −1 (2.5 − 25 µm) are, for example, described in [7][8][9]. This is the range of the fundamental vibrations, which provides powerful information both on the concentration and chemical composition of the investigated system.…”

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confidence: 99%