Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Analysis in liquid or solid state and in various conditions of cure, have been developed. The analysis is carried out by spectroscopy in the near-infrared region. Epoxy values are determined preferably at 2.205 microns, or else at 1.159 microns. The required path length in the specimen is between 1 and 10 mm, solid resins were examined either in disposable glass cells or in the form of cast sheet. A direct method of evaluation is used when the path length is precisely known, a relative method based on internal calibration when this is not the case. Similarly, a near-infrared method for the determination of hydroxyl groups in epoxy resins was developed. The use of the isosbestic principle led to an accurate method for the determination of hydroxy values in uncured epoxy resins.
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