Abstract
The degradation of the epoxy system was studied for the prepared six blend samples with the incorporation of 0 wt% - 25 wt% carboxyl terminated butadiene acrylonitrile (CTBN) copolymer, on a dynamic basis using Thermo gravimetric analysis (TGA) technique under a nitrogen atmosphere. The blends were prepared by physical mixing and were cured with diamine. The degradation of each sample followed second-order degradation kinetics, which was calculated by Coats-Redfern equation using best-fit analysis. This was further confirmed by linear regression analysis. The validity of data was checked by t-test statistical analysis. From this value of reaction order, activation energy (E), and pre-exponential factor (Z) were calculated. It was found that the activation energy increased with the addition of liquid elastomer.
Highlights
Research in the field of thermal degradation of epoxy systems is of great interest because this is an outstanding problem in the application these systems in different types of environment and for wider usage of these materials as structural adhesives, coatings and as matrices in fiber reinforced composites [1,2,3,4]
When the kinetics of thermal degradation is known, the data can be transformed over the whole temperature range and the temperature-dependent service lifetime can be calculated from these data
There was no shifting of peak positions related to oxirane functionality of glycidyl type diglycidyl ether of bisphenol—A (DGEBA) epoxy resin (912.7 and 834.5 cm–1) and non-glycidyl type cycloaliphatic epoxy resin (757.9 cm–1) while physical blending of both the epoxies in comparison to the peak positions of individual epoxy systems and discussed elsewhere [11,12,13]
Summary
Research in the field of thermal degradation of epoxy systems is of great interest because this is an outstanding problem in the application these systems in different types of environment and for wider usage of these materials as structural adhesives, coatings and as matrices in fiber reinforced composites [1,2,3,4]. Research in thermal degradation of epoxy systems is of great interest because this is an outstanding problem in the application these systems in different types of environment and for wider usage of these materials as structural adhesives, coatings and as matrices in fiber reinforced composites [2,3,4,5]. Coats-Redfern [8] equation was one of them to describe the aforesaid parameters
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