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Measurement of Beer‐Lambert Attenuation Coefficient and Curing Kinetics Power Order: A Method Based on Rapid‐Scan FTIR During Laser Curing on an ATR
Author(s) -
Li Wenlong,
Batteux Florian,
Araujo Steven,
Delpouve Nicolas,
Saiter JeanMarc,
Tan Li,
Negahban Mehrdad
Publication year - 2016
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201650022
Subject(s) - curing (chemistry) , materials science , attenuation coefficient , beer–lambert law , penetration depth , attenuation , fourier transform infrared spectroscopy , penetration (warfare) , composite material , optics , laser , analytical chemistry (journal) , chemistry , mathematics , operations research , physics , chromatography
Summary When photo curing a polymer system, one immediately becomes concerned with the depth of penetration of light into the system and how it affects the uniformity of the curing process. The attenuation of light is related to the Beer‐Lambert law of light penetration into the system, and its influence on the curing depends on the role of light intensity on the curing kinetics. The attenuation coefficient of the Beer‐Lambert law can be measured by direct light power measurements for light passing through different thicknesses of the material. In this article we show how the curing kinetics measured by following changes in the infrared light spectra obtained from rapid‐scan FTIR can be used to obtain both the Beer‐Lambert attenuation coefficient and the power factor, indicating the nonlinear influence of the light power on the curing process. The method is demonstrated for the photo curing of an acrylate cross‐linker, and verified using direct power measurement.