Free Volume Studies in Miscible Polymer Blend Systems

Jonathan A. Campbell, Andy A. Goodwin, Mohsen Safari Ardi, George P. Simon, Christine J.T. Landry-Coltrain

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


This paper summarises the currently available literature concerned with measurement of free volume in miscible, amorphous polymer blends using positron annihilation lifetime spectroscopy (PALS) which probes excluded volume at the angstrom level. Previously reported data is compared with new data from a range of different blend systems. Miscible blends tend to show a negative deviation of free volume size (and to a lesser degree free volume fraction) on mixing due to the intimacy of packing of the blend component macromolecules. A largely immiscible system is also reported and shows a different behaviour (positive deviation of free volume size) and this is ascribed to additional free volume at the interface.
Original languageEnglish
Pages (from-to)383-388
Number of pages6
JournalMacromolecular Symposia
Issue number1
Publication statusPublished - Jun 1997
Externally publishedYes


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