When an amorphous polymer is heated it shows no definite melting
temperature but progressively becomes less rigid. The molecular arrangement
in an amorphous material is all disorderly, just like that which occurs in a
liquid. It is for this reason, i.e. no structural change occurring, that no sharp
melting point occurs. For crystalline polymers there is an abrupt change at a
particular temperature. Thus if the density of the polymer were being
measured as a function of temperature, an abrupt change in density would be
seen at a particula ...
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