In our last post, the glass transition temperature (Tg) was shown to be a very good indicator of the degree of cure for thermosets.  In several posts in this series the use of differential scanning calorimetry (DSC) was presented as an easy and reliable method for measuring Tg at various states of cure.  DSC has an advantage in that the experimental method requires very small ... [Click to Continue...]

In the last post we started our discussion of how to monitor thermoset curing during processing and showed that the glass transition temperature (Tg) is a potential physical property that is useful for cure monitoring.  A common and easy way to measure Tg is using differential scanning calorimetry (DSC), but there are other analytical methods to determine Tg.  First, let’s look ... [Click to Continue...]

In the last few posts we have been talking about the curing of thermoset resins.  For a wide variety of products, ensuring the cure process is well characterized is key.  As we know, thermosets typically start as small molecules (monomers and oligomers) to allow ease of processing for applications such as adhesives, composites, laminates, and coatings.  Once the curing ... [Click to Continue...]

Guest Post by Dr. R. Bruce Prime As we have described before, differential scanning calorimetry or DSC is the most widely used analytical technique to characterize thermoset cure, due its ability to quickly and accurately measure the glass transition temperature Tg and conversion or degree of cure. Tg is the temperature where on heating the thermoset changes from a rigid ... [Click to Continue...]

In our last post we showed an epoxy amine system that was cured at 80oC for six hours resulting in a Tg of 107oC.  DSC analysis showed the fully cured Tg was 131oC.  What could you do to increase the Tg?  Based on the TTT diagram, the best option would be to increase the cure temperature.  With increased temperature one could also shorten the curing time.  A safe bet would be ... [Click to Continue...]