Why is the density of an amorphous polymer greater in its glassy state than in its rubbery state?
Why is the density of an amorphous polymer greater in its glassy state than in its rubbery state?
Homework Answers
when a polymer is cooled below Tg it become hard and brittle like glass. when a polymer used above its Tg it is in rubbery state
density=mass/volume. (volume and density are inversely related)
amorphous polymers are less dense compare to crystalline polymers this is because lack of perfect arrangement.If the arrangement is perfect volume will be less and density will be more.
In glass state the chains are frozen (solid) so volume is less and density is more
In rubbery state while increasing the temperature volume increases so density decreases
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Why is the density of an amorphous polymer greater in its glassy state than in its rubbery state?
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