Abstract
All amorphous polymers show the phenomenon of physical aging. After a quench from the rubbery into the glassy state, many physical properties of a polymer change with proceeding time. The material becomes stiffer and more brittle, its damping and creep rate decrease while the density increases. After a quench from the equilibrium into the non-equilibrium glassy state, the polymer shows a continuous decrease of the specific volume with time. This fact is due to the decrease of free volume of the material and is accompanied by a loss of mobility of the molecular segments. One assumes that this change of free volume and mobility is the origin of the variation of physical properties during aging. A deeper insight into the volume recovery phenomenon of polymers should, therefore, lead to a better understanding of the aging behavior.
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