The glass transition is a second order phase transition. For
materials that have a glass transition temperature, below it they
are hard and brittle and above it they are softer and
"rubbery".
The glass transition is a second order phase transition. For
materials that have a glass transition temperature, below it they
are hard and brittle and above it they are softer and
"rubbery".
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The glass temperature transition is for glass, polymers, etc.
(amorphous or semicrystalline materials), but not for leather.
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Low-density polyethylene does exhibit a glass transition at
around 150K.