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Identification
The glass transition temperature point occurs at heated temperatures for crystalline polymers, like LDPE. The polymer enters the glass state, essentially freezing the molecules in place. Just short of the next state, called the rubbery state, where molecules begin to wobble in place from heat, is the glass transition temperature turning point.
Features
Specifically, the glass transition juncture for LDPE is negative 193 degrees Fahrenheit. As it warms further, the molecules can wobble even more as they enter the rubbery state.
Misconceptions
Glass transition can easily be confused with melting, but they are acutely different. Melting requires the transfer of heat to the surroundings. But glass transition does not transfer heat; it merely keeps it contained within the polymer as it changes viscosity.