چكيده لاتين :
The kinetics and mechanism of cure react ion of DGESA with 4,4יoxydianiline(
ODA) as curing agent in the presence of thermoplastic ASS was
studied using isothermal FTIR and dynamic DSC techniques. The activation
energy (Ea) by FTIR analysis was evaluated as 36 kJ/mol and decreased to 31 kJ/mol
when the amount of ASS was increased from 10% to 30% by weight. Thermodynamic
parameters (LlH#, LlS#, and LlG#) for isothermal curing were calculated and the value of
LlG# did not change significantly by increasing the amount of ASS , while it increased
with increas ing isothermal curing temperature. The maximum temperature (Tp) of the
exothermal peak in DSC thermogram increased with increasing heating rate. The values
of Ea by using DSC data and Kissinger, Ozawa-Flynn-Wall, and isoconversional
equations were in the range of 55-65 kJ/mol. There was a small decrease in the Ea
value by increasing the amount of ASS which can be related to the ease of diffusion of
functional groups through the network and/or the catalytic influence of the nitrile group
(-CN) on the mechanism of cure reaction.
