Abstract
This work is aimed at investigating the cure, kinetics and rheological parameters of aramid/toughened epoxy prepreg. The cure reaction evolves simultaneously with changes in rheology, which is normally referred to as rheo-kinetic behavior. Understanding the cure behavior of a resin system is essential in the development and optimization of composite fabrication processes. The cure kinetics and rheological behavior were evaluated using a differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA) and a rheometer. Values of the kinetic parameters were obtained from dynamic DSC scans using an nth order reaction model. Rheological measurements as a function of temperature and time were made for the prepreg system. With the determination of the kinetics for the cure and of the rheological parameters of the prepreg systems, cure could be established that lead to manufacturing high-performance composite. The intention is to present a simple methodology to devise cure cycles for the automotive structural parts, therefore a simple model was selected which worked adequately for the desired accuracy. The effect of toughener was not taken into consideration as the scope was to aid the decision about the curing process.
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