Question

the Concentration of polymerization can be minimized by​

Answer 1

Answer:

Explanation:

Variation of peak exothermic temperature with heating rate is one technique to extract kinetic information from dynamic experiments. The technique gives an accurate measure of the activation energy for all reactions and the preexponential factor for nth-order reactions. In addition, this technique is valuable as a precursor of isothermal studies and is often the only means to analyze the polymerization kinetics of systems with multiple exotherms [2].

Nonisothermal DSC thermograms at various heating rates for the as-synthesized benzoxazine resins, i.e., BA-a and BA-35×, are shown in Figures 1 and 2, respectively. From these figures, information about the nature of the polymerization reaction such as initial curing temperature, peak temperature, and the curing range of both the resins at different scan rates could be derived. It can be observed that the exothermic peak shifts to a higher temperature with a higher heating rate. The average total exothermic reaction heat of BA-a and BA-35× is 341 and 299 J/g, respectively. Moreover, the step changes of the thermograms of both resins at the temperature range of 45-60 °C are the glass Tg of the benzoxazine monomers (Tg,o) or the devitrification of the resin.