- Free volume changes in mechanically milled PS and PC studied by positron annihilation lifetime spectroscopy (PALS)
- Polymer Engineering and Science
- Volume | Issue number
- 44 | 7
- Pages (from-to)
- Document type
- Faculty of Science (FNWI)
- Van 't Hoff Institute for Molecular Sciences (HIMS)
The effect of mechanical milling on free volume was studied by means of positron annihilation lifetime spectroscopy (PALS) in polystyrene (PS) as a typical brittle polymer and in polycarbonate (PC) as a tough representative. Long-time milling increases the free volume, while a decrease is observed for short milling times. The changes are mostly irreversible in PS. The irreversible fraction is much smaller for PC. Gel permeation chromatography (GPC) measurements show a decrease of the molecular weight, which is much more pronounced in PS. The milling-induced irreversible changes in free volume are attributed to chain-end defects resulting from chain scission. In PC, other deformation-induced defects that anneal upon heat treatment above the glass transition temperature dominate.
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