Abstract

A comparison of near-infrared (NIR) and mid-infrared (mid-IR) techniques for the determination of hydroxyl number in polyesters was made. Both of these analyses are faster and involve less exposure to irritating, highly toxic, and corrosive chemicals than the chemical analysis, although both techniques rely on developing calibration files. The mid-IR procedure consisted of making thin films of polymer on IR crystals by spin coating and taking transmission spectra. The program used for the analysis, Nicolet PLS Quant, compensated for the resulting indeterminate pathlength. The NIR procedure consisted of taking transmission spectra of the clear, viscous polymers in 4-mm cuvettes and using standard regression analysis of the spectra.

Real-time observation of structural change in semi-crystalline polymer films through mid-IR transmission spectroscopy: determination of instantaneous film temperature during recrystallization

Sandeep Kumar Maurya, Takashi Nakajima, Keisuke Mizobata, Heishun Zen, Toshiteru Kii, and Hideaki Ohgaki
Opt. Express 26(17) 21615-21625 (2018)

Determination of glucose in whole blood samples by mid-infrared spectroscopy

Yoen-Joo Kim, Sangjoon Hahn, and Gilwon Yoon
Appl. Opt. 42(4) 745-749 (2003)

Mid-infrared near-field spectroscopy

Sergiu Amarie, Thomas Ganz, and Fritz Keilmann
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Nondestructive determination of SSC in an apple by using a portable near-infrared spectroscopy system

Yizhe Zhang, Jipeng Huang, Qiulei Zhang, Jinwei Liu, Yanli Meng, and Yan Yu
Appl. Opt. 61(12) 3419-3428 (2022)

Mid-IR spectroscopy with NIR grating spectrometers

Paul Kaufmann, Helen M Chrzanowski, Aron Vanselow, and Sven Ramelow
Opt. Express 30(4) 5926-5936 (2022)