1. In a previous report, one of the authors
* estimated the necessary activation energy
E of the baking reation of resin finishing as approximately 16_??_18kcal/mol, based on data derived from commercial products. The activation energy
E and frequency factor
A of the reaction presented in this report are calculated by using our experimental measurements. For this purpose, we have made two series of experiments: a) baking of resin on clean glass plates, and b) baking of resin on cotton fabrics.
2. Our experimental results fully agreed with the following equation of unimolecular reaction: where
a: Unreacted part of resin i.e. in 70°C water soluble part at
z=0 by Kyeldhal method.
a-
x: do. at
z=
z (min.)
k: Reaction velocity constant at temp.
T°K
z: Baking time (min.)
z0: Waiting time (min.)
3. In all the experiments, the reaction velocity constant
k fully agreed with the Ahrrenius equation:
ln k=
A+(-
E/
RT) where
R: gas constant.
4. From the said results, the activation energy
E and frequency factor
A are culculated as follows: for series a)
E 8.82kcal/mol,
A 2, 178 10
-1 min. for series b)
E 18.85kcal/mol,
A 1, 012 10
-1 min.
5. We have further made cumulative baking at various temperatures and have found that experimental results agreed with the cumulative reaction equation:
6. We conclude from the great difference of the activation energy
E in the above two series, that in series a) only reaction between resin components occurs, whereas in series b) reaction between resin components and cellulose predominates.
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