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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228 Ultra-High Free Volume Polymers
Ultra-high free volume polymers (UHFVPs): Free volume in a polymer can be defined as the volume of the total mass that is not occupied by polymer chains themselves, and hence diffusing molecules can be situated there (Figure 228.1). It can generally be said to be the gap or pores occupied between the chains of polymers. The most extensively applied technique for determining the distribution of free volume is positron annihilation lifetime spectroscopy (PALS).
The concept of free volume is important, since it is commonly considered to be the volume enabling molecular reorganization and may therefore be associated with phenomena such as diffusion, viscoelasticity, and the glass ...
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