Interpretation and Physical Meaning of Kinetic Parameters Obtained from Isoconversional Kinetic Analysis of Polymers

Abstract

Several successful examples—where physically sounded kinetic information was obtained from thermoanalytical data in different application fields, such as polymerization of thermosetting resins, biobased polymers and nanocomposites, crystallization and glass transition of semi-crystalline polymers and their nanocomposites—are here presented and discussed. It is explained how the kinetic parameters obtained from advanced isoconversional methods can be interpreted in terms of reaction mechanisms or changes in the rate-limiting step of the overall process, in the case of complex chemical reactions or complex physical transitions, and how these parameters can be used to extract model-fitting parameters.

Aromatic dialdehyde-based bisbenzoxazines: The influence of relative position of oxazine rings

“…Isoconversional kinetic analysis has proven to be very useful in the elucidation of curing mechanisms. [28] Figure 3-a depicts the degree of curing as a function of temperature, at different heating rates for both Ph-fa[2,2']tpa and Ph-fa[2,2']ipa. We can observe that for all heating rates, kinetic profiles are parallel.…”

Synthesis and characterization of novel methacrylate copolymers having pendant piperonyl group: monomer reactivity ratio, thermal degradation kinetics, and biological activity

“…Non-isothermal methods are based on the ratio of the temperature difference between the sample and the reference material receiving equal heat to the temperature of the reference material. 24 The most widely used non-isothermal methods for determining the thermal activation energy are known as Kissinger and Ozawa. For kinetic studies, thermograms of all polymer samples were obtained at four different heating rates (5.0, 10.0, 15.0, and 20.0 o C min À1 ) in an inert N 2 atmosphere.…”

Thermal Kinetics of Monocationic and Dicationic Pyrrolidinium-Based Ionic Liquids

“…Nevertheless, the most popular technique involves the determination of onset temperature ( T o ), which is measured by using a thermogravimetric analyzer (TGA) [ 9 , 10 ]. Through TGA, an isoconversional kinetic study can be conducted due to its reliability of providing a detailed evaluation for the determination of kinetic parameters [ 11 ]. There are three methods based on the iso-conversional kinetic: maximum rate, differential and integral isoconversional.…”