Simultaneous kinetic and microdielectric studies of some epoxy-amine systems

Moisture Uptake and Thermomechanical Behavior of Epoxy–Amine Networks Derived from Ortho-Substituted Monomers

“…The MeEt-MDA and DiEt-MDA mixtures had much higher peak exotherms that were 53–62 and 61–70 °C higher than the corresponding MDA mixtures, respectively. These results are consistent with the previous studies on DGEBA and DiEt-MDA , which showed longer gelation times than the corresponding MDA -cured network. , The higher peak exotherms and correspondingly lower reactivity of the MeEt-MDA and DiEt-MDA mixtures are due to a combination of steric hindrance near the aniline functional group, as well as a dilution of the reactive functional groups in the mixtures with increasing hydrophobic content.…”

Curing Behavior and Final Properties of Nanostructured Thermosetting Systems Modified with Epoxidized Styrene‐Butadiene Linear Diblock Copolymers

“…As can be seen in Figure 8, the divergence of the η * magnitude occurs at about 250 min, which is in good agreement with the gelation time reported for the DGEBA/MCDEA system 44–46. Moreover, although not shown here in order to avoid repeatable data, this time also agrees with that determined by us from DSC measurements (following the protocol described in ref 44–4644, 46 by fitting the experimental conversion evolution to the model used by Eloundou et al46 at 140 and 160 °C (obtaining similar values for the different constants45, 46).…”

“…It is well known that the simplest method for the estimation of gelation times from rheological measurements is the divergence of the complex viscosity 43. As can be seen in Figure 8, the divergence of the η * magnitude occurs at about 250 min, which is in good agreement with the gelation time reported for the DGEBA/MCDEA system 44–46. Moreover, although not shown here in order to avoid repeatable data, this time also agrees with that determined by us from DSC measurements (following the protocol described in ref 44–46…”

Bio‐based hydrophobic epoxy‐amine networks derived from renewable terpenoids

“…Network A had the highest T G followed by networks C and B , while network D had the lowest T G . The T G for network B as measured by DSC (154 °C) was similar to the predicted fully cured T G for a network prepared from MDEA and DGEBA (165 °C) . For comparison, the T G of the networks was also measured via TMA and is reported as the peak loss temperature.…”