METHODOLOGY FOR GENERATION OF TIME-TEMPERATURE-TRANSFORMATION (TTT) DIAGRAM: SOLID AND CELLUAR EPDM

摘要

The vulcanization kinetics of solid and cellular EPDM are studied using Differential Scanning Calorimetry (DSC). This study uses dynamic DSC to obtain the total heat of vulcanization and isothermal DSCs show the reaction rate behavior at constant temperatures and the presence of the diffusion in the process, using a novel technique (quasi-isothermal tests). Modeling employs modified Hernandez-Ortiz and Osswald methodology that uses a non-linear regression routine and is based on Kamal-Sourour model to calculate the kinetic variables of the reaction; also includes DiBenedetto's equation to find the diffusion variables. The TTT-cure diagrams are built by numerical integration of the adjusted kinetic model and vitrification line is calculated by the change of glass transition temperature (Tg) with curing degree.