Diffusion-controlled reaction mechanisms during cure in polycarbonate-modified epoxy networks

Elucidating How Advanced Organophosphine Accelerators Affect Molding Compounds

“…A general equation for the curing reactions of EMCs is as follows. ,,− r = normald α normald t Where α is the conversion and r is the rate of reaction. EMCs that contain TPP and TPP-BQ accelerators were cured at six fixed temperatures130, 150, 165, 175, 185, and 195 °C.…”

Cure kinetic study of carbon nanofibers/epoxy composites by isothermal DSC

“…In the early stage of cure (before gel or vitrification), the cure reactions are mainly controlled by the kinetic rate of the chemical reaction. Subsequently, the cure reaction reaches higher conversions, where the reaction gradually becomes diffusion controlled 19, 25–27. When the system reaches the gel point, a network is gradually formed with an infinite molecular weight and the viscosity of the system would increase significantly, and the system is transformed from a liquid/rubbery state to a glassy state.…”

Pseudo‐interpenetrating polymer networks based on tetrafunctional epoxy resins and poly(methyl methacrylate)

“…There are several references to the research literature with the following overlapping keywords: TGDDM, epoxy, networks, and kinetics 20–33. In this investigation, the symmetric deformation of the cyclic ether group at 906 cm −1 was used to monitor chemical crosslinking reactions involving TGDDM, whereas the aromatic CC stretch at 1512 cm −1 in this tetrafunctional epoxy resin served as an internal reference for all of the samples.…”

“…An increase in λ, or a decrease in the apparent kinetic rate constant for the formation of the epoxy network in the presence of MMA, is consistent with a sterically hindered environment due to the mutual entanglement of dissimilar chains 34. A diffusion‐controlled mechanism was used to model crosslinking kinetics during the later stages of the reaction between TGDDM and an aromatic amine crosslinking agent in the presence of bisphenol‐A polycarbonate 21. Furthermore, calorimetric studies of the crosslinking kinetics22 of TGDDM and 4,4′‐diaminodiphenylsulfone in blends with bisphenol‐A polycarbonate yielded simple n th‐order rate laws with values of n between 1.2 and 1.5.…”