2014
DOI: 10.1016/j.polymertesting.2014.06.007
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Quantification of PLA contamination in PET during injection moulding by in-line NIR spectroscopy

Abstract: In-line spectroscopy is a useful tool for monitoring processing conditions and polymer quality in the melt state in processes such as extrusion and injection moulding. This study extends the scope of this technique to the quantitative detection of poly(lactic acid) (PLA), which is a contaminant of concern in recycled poly(ethylene terephthalate) (PET). The near-infrared spectra of thermally treated PLA were studied for evidence of spectral changes which could be used as markers for PLA in PET, and these are di… Show more

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Cited by 22 publications
(16 citation statements)
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“…In this case, the NIR probes were attached to the injection-molding machine [62]. PLS was used to develop a model to predict the PLA concentration based on the acquired NIR spectrum in a more organized way by dividing the spectra into sub-regions based on different chemical bonds.…”
Section: Chemical Bonds Like C-h N-h and O-h Absorb Lightmentioning
confidence: 99%
“…In this case, the NIR probes were attached to the injection-molding machine [62]. PLS was used to develop a model to predict the PLA concentration based on the acquired NIR spectrum in a more organized way by dividing the spectra into sub-regions based on different chemical bonds.…”
Section: Chemical Bonds Like C-h N-h and O-h Absorb Lightmentioning
confidence: 99%
“…NIR spectroscopy, which mainly reflects overtones and combinations of the C-H, N-H, and O-H functional groups, has been widely used as a measurement technique for in-line monitoring of the pellet coating process, [8] for studying accuracy of in-line milk composition analysis, [9] and for quantification of poly(lactic acid) contamination in poly(ethylene terephthalate) during injection molding. [10] Raman spectroscopy has recently emerged as a complementary analytical tool to NIR spectroscopy. Compared to NIR spectroscopy, Raman spectroscopy has no specific requirements on physical form of the sample and sample preparation.…”
Section: Introductionmentioning
confidence: 99%
“…Near-infrared (NIR) and mid-infrared (MIR) show different details of the chemical structure in different spectral ranges. NIR spectra (12500 to 4000 cm -1 , corresponding to 0.8 to 2.5 µm) are often used to investigate polymer blends and curing kinetics or to predict mechanical properties [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. In the NIR range, A. Kelly et al [1] measured the drug and plasticizer content in a polymer melt.…”
Section: Introduction *mentioning
confidence: 99%