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In-line fiber-optic near-infrared spectroscopy: Monitoring of rheological properties in an extrusion process. Part I.

โœ Scribed by M. G. Hansen; S. Vedula

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
272 KB
Volume
68
Category
Article
ISSN
0021-8995

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โœฆ Synopsis

In-line monitoring of chemical processes is desired for its numerous advantages, such as lesser waste, lower developmental cycle time, and lesser costs. In this study, a methodology is presented for estimating polymer rheological properties using fiber-optic near-infrared (NIR) spectroscopy. Predictive calibration models are developed for simultaneous, in-line monitoring of polymer melt flow index (MI) and comonomer concentration for a system of poly(ethylene vinyl acetate) copolymers. The NIR spectra of flowing, molten poly(ethylene vinyl acetate) (EVA) copolymers are collected in a flow cell attached to a single-screw extruder. Multivariate statistical regression analysis is presented for correlation of MI and absorbance in the methylene (C{H) stretch, first overtone NIR wavelength region (1620-1840 nm). Results for simultaneous, real-time monitoring of MI and comonomer composition are discussed in detail.

๐Ÿ“œ SIMILAR VOLUMES

In-line fiber-optic near-infrared spectr
In-line fiber-optic near-infrared spectroscopy: Monitoring of rheological properties in an extrusion process. Part II.
โœ S. Vedula; M. G. Hansen ๐Ÿ“‚ Article ๐Ÿ“… 1998 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 440 KB ๐Ÿ‘ 1 views

In an extrusion process, linear viscoelastic properties of molten poly(ethylene vinyl acetate) (EVA) copolymers, which have one principal factor of variation, can be estimated from in-line near-infrared (NIR) spectra. The NIR transmission spectra of molten polymer flow stream were collected in a flo