Changes in the CN group infrared absorption of dicyandiamide in the presence of moisture

Autor:	Roger Fountain, Thomas W. Haas
Rok vydání:	1975
Předmět:	Polymers and Plastics Moisture Nitrile Chemistry Infrared digestive oral and skin physiology Analytical chemistry Infrared spectroscopy General Chemistry Surfaces Coatings and Films Absorbance chemistry.chemical_compound Materials Chemistry Adhesive CN-group Stoichiometry
Zdroj:	Journal of Applied Polymer Science. 19:2059-2064
ISSN:	1097-4628 0021-8995
DOI:	10.1002/app.1975.070190724
Popis:	A correlation between lap shear bond strength and an infrared absorbance ratio of reactive groups in a commercial dicyandiamide (dicy.)-cured epoxy adhesive was explained by the presence of a hidden factor in the nitrile absorbance measurement of the dicyandiamide. The absorbance at 2210 cm−1 due to the CN of the dicy. was the denominator of the absorbance ratio in the correlation. Water present in the adhesive changed the two infrared absorptions in the 2200 cm−1 region of the spectrum resulting in a lower 2210 cm−1 absorbance than expected stoichiometrically for high (0.4%) water concentrations in the adhesive.
Databáze:	OpenAIRE
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