The Thermal Properties Analysis of the Mixtures Composed with Epoxy Resin and Amine Curing Agent

Abstract

Abstract:In this work, a series of molar ratios composed with YD-128 and DDM were chosen based on the viscosity analysis. The mixtures of YD-128 and DDM with the different molar ratios were cured at 170°C for 15 min followed by post cure at 190°C for two hours. The thermal properties of the cured samples were investigated with DSC, TGA, DMA, and TMA. The conversion ratio of the mixtures of YD-128 and DDM (1 : 1.1) was calculated by dividing ΔH obtained from DSC experiments for each cured sample by ΔH. The TGA data of the cured samples showed that the thermal stability and thermal degradation activation energy were proportional to the amount of DDM in the mixtures. However, the highest tan δ, and the lowest thermal expansion data with DMA and TMA respectively were obtained from the stoichiometric mixture of YD-128 and DDM. Furthermore, the different ratio of mixtures were applied to test specimens to be cured at 170°C to measure single lap shear strength with universal testing machine.

Synthesis of adhesion promoter for lead frame bonding and application of epoxy composite materials

“…In contrast, if the T m is too low, phase separation problems can occur when manufacturing EMC compositions in solid powder form. Accordingly, the T m is an important criterion for setting processing and molding conditions in EMC production 37 . However, in DSC analysis of polymers, visible peaks may occur even if they are not Tm peaks, which may be caused by melting of the polymer or other thermal changes.…”

Preparation of a branched amine and physical and thermal studies of epoxy compositions including the amine compound

“…However, the cured polymers have a high glass‐transition temperature ( T g ) and good mechanical properties. Moreover, the polymers show high thermal stability and high activation energy of thermal decomposition, in addition to good adhesion onto substrates …”