Infrared laser heating for studies of cellulose degradation
We describe a new technique for studying thermally induced chemical transformations in cellulose. The apparatus consists of a carbon dioxide laser for heating, an IR thermometer, and an optical reflectance spectrometer for tracking the progressive discoloration of the sample. To illustrate the technique, we present measurements from a single piece of sample linen along five isotherms in the 200--290/sup 0/C range. We derive an algebraic expression for the reflectivity of the sample as a function of the areal concentrations of the chromophoric states produced at temperature. The results are then explained in terms of first-order chemical rate theory and a four-step model. From the measurements we derive the activation energies, Arrhenius constants, and reflectivities of the chromophoric states.
- Research Organization:
- Kaman Sciences, 1500 Garden of the Gods Road, Colorado Springs, Colorado 80907
- OSTI ID:
- 7088851
- Journal Information:
- Appl. Opt.; (United States), Vol. 27:18
- Country of Publication:
- United States
- Language:
- English
Similar Records
Identification of Uranium Minerals in Natural U-Bearing Rocks Using Infrared Reflectance Spectroscopy
Characterization of surface contaminants using infrared microspectroscopy
Related Subjects
CELLULOSE
HEAT TREATMENTS
OPTICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
AGING
LASER RADIATION
MONITORING
OPTICAL SPECTROMETERS
REFLECTIVITY
THERMOMETERS
CARBOHYDRATES
ELECTROMAGNETIC RADIATION
MEASURING INSTRUMENTS
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
POLYSACCHARIDES
RADIATION EFFECTS
RADIATIONS
SACCHARIDES
SPECTROMETERS
SURFACE PROPERTIES
360605* - Materials- Radiation Effects
360603 - Materials- Properties