Reaction heat flow graph

In the case of DOMS-SA, no double peak could be put in evidence from the heat flow graph related to the isothermal cure performed in the DSC pan (Figure 8). This can be easily explained if one considers that in this case the reaction occurs at a temperature higher than the isotropization temperature of the growing thermoset, and therefore no kinetic effect due to the liquid crystalline state of the polymer can be expected on cure. 

Figure 2.112. Nonreversing (NR) heat flow (a), heat capacity change (ACp) (b), and heat flow phase (( )) (c) for the isothermal cure of stoichiometric diglycidyl ether of bisphenol A (DGEBA) and methylenedianilme (MDA) mixture at 70/80/100 °C the increase in ACp due to reaction and the stepwise decrease due to vitrification are indicated on the graph (1 °C/60s) [data reproduced fromSwier et al. (2004) with permission of John Wiley Sons, Inc.].

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