Ultraviolet and infrared absorption spectra of malonaldehyde in organic solvents

1968 ◽  
Vol 16 (4) ◽  
pp. 639-642 ◽  
Author(s):  
Tai-Wan. Kwon ◽  
John. Van der Veen
Keyword(s):  
Absorption Spectra ◽  
Organic Solvents ◽  
Infrared Absorption ◽  
Infrared Absorption Spectra

A Technique for Obtaining the Infrared Absorption Spectra of High Gel Rubbers

1957 ◽  
Vol 30 (1) ◽  
pp. 352-353
Author(s):  
Bernard M. Mitzner
Keyword(s):  
Sample Preparation ◽  
Polymer Solution ◽  
Absorption Spectra ◽  
Organic Solvents ◽  
Rock Salt ◽  
Infrared Absorption ◽  
Convenient Method ◽  
Benzene Solution ◽  
Liquid Cell ◽  
Infrared Absorption Spectra

Abstract Several techniques have been previously described for obtaining the infrared absorption spectra of various types of rubbers. The most convenient method is to dissolve the substance under investigation in a suitable solvent and obtain the spectrum as a solution employing a sealed liquid cell. Another technique that is commonly employed is to evaporate a benzene solution of the polymer to dryness on a rock salt plate, thus obtaining a film. A more time consuming procedure consists of floating a polymer solution on a mercury pool which can subsequently be picked up by a steel frame and studied as a film. All the above procedures, although useful when investigating low gel rubbers, cannot be successfully employed with high gel rubbers. Modified polybutadiene crumb rubbers form extremely stable gels, and are almost completely insoluble in all common organic solvents. Because of this great insolubility, one is limited in infrared sample preparation. Attempts to employ the KBr pressed disc technique have met with very little success in our laboratory.

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