Volume 53, Number 4, February 2001
|Page(s)||497 - 503|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 December 2003|
Free volumes and occupied volumes in oligomeric polypropylenglycols
Dipartimento di Fisica,
Politecnico di Milano Piazza Leonardo da
Vinci, 32, 20133 Milano, Italy
2 Dipartimento di Chimica Industriale e Ingegneria Chimica "G. Natta"Politecnico di Milano, Piazza Leonardo da Vinci, 32, 20133 Milano, Italy
Corresponding author: email@example.com
Accepted: 27 November 2000
It is shown that combined use of positron annihilation lifetime spectroscopy-an experimental tool to investigate the intermolecular sub-nanometric spaces (free volume) in amorphous polymer-and of specific-volume measurements supplies unique information on the occupied volume, allowing one to study its behavior under variation of thermodynamic quantities. In the present case thermal expansion is considered. The methodology has been applied to two members of a homologous series of polypropyleneglycol oligomers; however, it can be used in principle to any disordered macromolecular structure and liquids.
PACS: 61.25.Hq – Macromolecular and polymer solutions; polymer melts; swelling / 65.70.+y – Thermal expansion and density changes; thermomechanical effects / 78.70.Bj – Positron annihilation
© EDP Sciences, 2001
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