I have a question that is bothering me since few weeks. I'm not a chemist, nor I have any experience with polymers theory, but:
Epoxy - is defined on Wikipedia as a thermoset polymer as a process of polimerization occurs that can not be reversed.
PVA - Is defined (again on Wikipedia) as a thermoplastic polymer.
So why the cured epoxy has a glass transition temperature, and therefore when heated above that temperature it softens and its shape can be modified. But when PVA glue hardens (by loss of humidity) it can not be softened by heat?