Simultaneous kinetic and microdielectric studies of some epoxy–amine systems

✍ Scribed by Jean Pascal Eloundou; Ohandja Ayina; Hippolyte Ntede Nga; Jean François Gerard; Jean Pierre Pascault; Gisèle Boiteux; Gérard Seytre

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 233 KB
• Volume: 36
• Category: Article
• ISSN: 0887-6266
• DOI: 10.1002/(sici)1099-0488(19981130)36:16<2911::aid-polb6>3.0.co;2-z

✦ Synopsis

Three reactive epoxy-amine systems based on diglycidyl ether of bisphenol A (DGEBA) with 4,4Ј-diaminodiphenylsulfone (DDS), 4,4Ј-methylenebis [3-chloro 2,6diethylaniline] (MCDEA), and 4,4Ј-methylenebis [2,6-diethylaniline] (MDEA), were studied during isothermal curings at 140 and 160°C. The simultaneous kinetic and dielectric studies allow to express conductivity, , in terms of conversion, x, and of glass transition temperature, T g . The conductivity, 0 , of the initial monomer mixture and, ϱ of the fully cured network are measured. It is found that:

• The glass transition temperature, T g , versus conversion, x, curves follows the equation of Di Benedetto modified by Pascault and Williams • There exists a linear relation between log /log 0 and T g . So, it is possible to predict both kinetic and dielectric behaviors of these epoxy-amine systems by the knowledge of T g0 , ⌬C p0 , and 0 , respectively, glass transition temperature, heat capacity, and conductivity of initial monomer mixture, T gϱ and ⌬C pϱ , and ϱ , respectively, glass transition temperature and heat capacity and conductivity of fully cured network.