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제105회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Comparison of Diffuse Reflectance Near-infrared spectroscopy and Direct Transmission Raman spectroscopy for the determination of density of polymer.

2010년 2월 23일 16시 17분 48초
35P93포 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 <발표Ⅳ>
저자 및
김재진, 정회일
한양대학교 화학과, Korea
Diffuse reflectance mode can provide the convenience of spectral collection for solid samples when near-infrared spectroscopy is used; however, it has also drawbacks that can negatively influence on accuracy of quantitative analysis. The resulting spectra may represent chemical information related to only sample surface rather than whole same characteristics because the penetration depth of NIR radiation into a sample is not large compared to the size of granular sample. Also, Raman spectra are usually collected by back-scatter mode, which would also provide chemical information related to only surface. The objective of this study is to investigate the possibility of improving the accuracy for density determination of polyethylene (PE) pellet through direct transmission NIR as well as Raman measurement. For NIR measurement, single pellet was located at the center of beam path for spectral collection. For Raman measurement, a laser was illuminated on single pellet and the resulting Raman signal was collected at the opposite side. Both spectral features from NIR and Raman measurements were compared. Finally, the accuracies of density determination from both measurements were compared with the use of partial least squares (PLS) regression.