Using the Coats-Redfern Method during Thermogravimetric Analysis and Differential Scanning Calorimetry Analysis of the Thermal Stability of Epoxy and Epoxy/Silica Nanoparticle Nanocomposites

Abstract

In this paper, we provide a study of the thermal decomposition behavior of epoxy and epoxy/silica nanoparticle nanocomposites by using thermogravimetric analysis and differential scanning calorimetry techniques at temperatures ranging from 25°C to 600°C, using a constant heating rate of 10°C per minute under inert atmosphere. With increasing silica nanoparticle percentages of 2%, 4%, 6% and 8%, the kinetic parameters of the activation energy, frequency factor, and thermodynamics property were determined at conversion ranges between 20% to 80% using the Coats-Redfern method for diffusion control reaction (Janders) model. The Arrhenius equation for epoxy decomposition at a heating rate of 10°Cper minute equaled 5.7278x e185.984/RT. Thermal decomposition occurred through two stages: (1) with volatile removal and (2) with a random chain break. The effects of variation of silica nanoparticle percentages on glass transition temperature was investigated. The activation energy, frequency factor, rate constant, and other thermodynamic properties increased with additional silica nanoparticle content due to more bonding, as it needed more heat to break.

Effect of ionic liquids on thermomechanical properties of polyetheretherketone‐multiwalled carbon nanotubes nanocomposites

“…The thermal properties of polymer nanocomposites were discovered to have a linear relationship with the apparent activation energy. 50 This demonstrates the addition of IL-assisted MWCNTs into PEEK, substantially hindering the thermal degradation stability. 51 Also, the flexible polymer ring mobility and plasticizing effects of ILs decreased the activation energy and thermal stability of polymer composites when the amounts of ILs were more than 1 wt%.…”

On the Mechanical and Thermal Properties of Poly(Vinyl Alcohol) – Alginate Composite Yarn Reinforced with Nanocellulose from Oil Palm Empty Fruit Bunches

“…The TGA curves can be further analyzed to determine the observed activation energy (E obs ) through the Coats-Redfern method since the thermal degradation of polymer is a first-order reaction. This model is a multi-heating rate that has been widely used for kinetic analysis of thermal decomposition [46][47][48]. Shukla et al [49] also used this model for the multi-stage decomposition of epoxidized resole resin.…”

Performance Evaluation for Ultra-Lightweight Epoxy-Based Bipolar Plate Production with Cycle Time Reduction of Reactive Molding Process

“…The Kissinger’s model [ 31 , 33 , 34 , 35 , 36 ] was basically used for dynamic conversion, while the Flynn–Wall–Ozawa model [ 31 , 33 , 34 ] was applied for iso-conversion. The Vyazovkin model [ 36 , 37 , 38 ] and Coats-Redfem model [ 39 ] were employed to predict the polymerization kinetics of the epoxy.…”