Figure 3 - uploaded by Christoph Schick
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Adiabatic temperature increase polymerization of ε-caprolactam: 1 -total increase, 2 -due to the polimerization, 3 -due to the crystallization.
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Context 1
... molecules. It is also seen that the start time of crystallization does not depend on the concentration of the activator. Increasing initial activator concentration (Fig. 4, curves 1-4) does not influence the maximum degree of crystallinity reached at the end of the process. It only leads to an increase of the crystallization rates. Curve 1 in Fig. 3 is the total temperature increase due to the polymerization and crystallization. In the same Figure curve 2 is the temperature increase due to the polymerization determined from T-T0=52. The difference between these two curves yields the adiabatic temperature rise due to crystallization (curve 3, Fig. 3). Given the competing effects ...
Context 2
... of the crystallization rates. Curve 1 in Fig. 3 is the total temperature increase due to the polymerization and crystallization. In the same Figure curve 2 is the temperature increase due to the polymerization determined from T-T0=52. The difference between these two curves yields the adiabatic temperature rise due to crystallization (curve 3, Fig. 3). Given the competing effects of the factors indicated it is possible to explain the fact that during the adiabatic polymerization of ε-caprolactam up to an initial temperature of 150°C the polymerization and the crystallization occur in parallel. At initial temperatures 150ºC the crystallization rate decreases so that only after ...
