Rheol Acta 46, pp. The reaction between epoxy and amine is highly exothermic. The expendable cost is the estimated cost of supplies needed for each group of students involved in the activity. Everyday Polymers Students explore the chemical identities of polymeric materials frequently used in their everyday lives. All things being equal, you could say that the bridge on the bottom is more mechanically robust than the bridge on the top.
Bridges with fewer chemical connections are more flexible.
The amount of disorder in the system; can be used to discuss how many configurations a polymer chain can take. To help counter the heat released, also place the container in a water bath. Next, let's consider the foundation for a thermoset system. New Twists on Old Favorites Solids: Give students time to complete the pre-lab questions after the presentation 15 minutes total for presentation and questions.