The reaction kinetics of epoxy resin cured with diethyl triamine containing a series of new active toughening agents, e.g., polypropoxyl polyamine (PPA) was monitored by means of FT IR and JSR II curoelastomer, respectively. The experimental data showed that an almost linear relation between the epoxide conversion and reaction time was observed at early stage; gel time t 10 measured from JSR II curoelastomer was more than that of t g (true gel time), and the epoxide conversion α 10 ...