As regard the calorimetric curves of PBSPBDG120, PBSPBDG180, and pure PBDG, only an intense endothermal
baseline deviation associated with the glass transition is observed.
In E4E/THPA, the exothermic pick was subtracted by endothermal
effect of E4E melting and it was hard to deal with the curing kinetics using non-isothermal data.
Onifine P decomposes by an endothermal
instead of an exothermal reaction.
1]) using the integration of the areas under the endothermal
peaks and corrected base lines.
From the DSC figure, two endothermal
peaks were observed; corresponding temperatures are 136 and 249 [degrees]C, respectively.
The inflection point in specific heat capacity and the peak value of the endothermal
part of the DSC curves were taken as, glass transition temperature ([T.
Also, the intensity of the endothermal
melting peak is increased considerably and the melting point shifts to a slightly lower temperature (317[degrees]C) compared with the un-drawn sample.
The possible explanations for this were: (1) the resin was swollen more completely at higher temperature, which made Hg(II) ions diffused more easily into the inside of resin; (2) the adsorption was an endothermal
process and high temperature was of benefit to the adsorption.
However, for values higher than 25[degrees]C/min, other endothermal
reactions, like decomposition of the material or styrene evaporation, can occur simultaneously to curing.
1, curves b, c), the initially formed lamellae can hardly evolve because of the high transportation energy, resulting in a small endothermal
peak of [T.