Abstract
In the previous report, mutual reactions of resin monomers and reactions between resin and cellulose molecules observed through formaldehyde liberation were studied during the thermal treatment under various conditions. The results were discussed in comparison with those obtained from the torsional rigidity determined by the dynamic viscoelasticity.
It has been found so far that the thermosetting progress and the chemical reaction proceeded keeping parallel pace, but activation energies obtained chemically from the liberation of formaldehyde were higher than those obtained physically from the dynamic viscoelasticity. This was probably due to neglect of the reaction in which water liberated.
In this study, therefore, water liberated with proceeding of the above reaction was taken into consideration. After that an attempt was made to consider the contribution of activation energies from both formaldehyde and water in proportion to the molar ratio of the two products.
The apparent activation energy for each resin finished fabric thus obtained remarkably coincides with that obtained from the torsional rigidity. From these facts, it was made clear that the result observed from the physical aspect agreed well with that obtained from the chemical reaction when all the possible products were taken into consideration.
