July 2024
Intermediate to advanced
280 pages
12h 52m
English
Content preview from The Essential Handbook of Polymer Terms and Attributes
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134 Physical Aging of Polymers
Physical aging of polymers refers to structural relaxation of the glassy state toward the metastable equilibrium amorphous state, and it is accompanied by changes in almost all physical properties.
Physical aging of polymers involves a change in the free volume within the amorphous regions of a polymer matrix. Specifically, it involves a volumetric contraction of the matrix that occurs over time. This should be observable as a change in dimensions as well as properties. The dimensional changes are usually much more subtle than the property changes. The amount of dimensional change will depend on several factors. These include the size of the part, the molecular weight of the polymer, ...
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