The glass transition is analogous to the melting point of a solid (a phase change).   The difference is that epoxies are not small, simple molecules, like water (think of ice), or atoms, like pure metals.  Ice and metals are materials that have well defined melting points.

Epoxies are molecules with chain lengths that get entangled with the adjacent epoxy molecules, and when cured have crosslinked sites between the molecules.

A cured epoxy is a matrix that is randomly bound together as a rigid mass.  But that mass still responds to changes in temperature - just not as freely as the unrestricted molecules of water and the atoms of metals.

READ THE BLOG: The Glass Transition in Epoxies



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