Kinetic analysis of color changes in cellulose during heat treatment |
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Authors: | Miyuki Matsuo Kenji Umemura Shuichi Kawai |
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Institution: | (1) Research Institute for Sustainable Humanosphere, Kyoto University, Gokasho, Uji Kyoto, 611-0011, Japan |
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Abstract: | This paper deals with the kinetics of the color changes of cellulose during heat treatment. The color of cellulose heated
at 90–180°C was measured by a spectrophotometer and expressed by CIELAB color parameters. The values of L* decreased and those of a*, b* and Δ
E*
ab
increased at all the treatment temperatures. Several kinetic models, namely, the zero-order, first-order, second-order and
autocatalytic model, were applied to the changes in the color values. Furthermore, the results of kinetic analysis using the
best-fit model were compared to the results obtained from conventional kinetic models. It was suggested that the kinetic analysis
using the best-fit model was the better way to accurately predict color changes during heat treatment. The values of apparent
activation energy calculated from the changes of L*, a*, b* and Δ
E*
ab
were 125, 124, 118 and 120 kJ/mol, respectively. These values were similar to the reported values calculated from other chemical
or mechanical properties. |
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Keywords: | |
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