Free Volume Distribution in Monodisperse and Polydisperse Poly(methyl methacrylate) Samples

K. Süvegh, M. Klapper, A. Domján, S. Mullins, W. Wunderlich, A. Vértes

Research output: Contribution to journalArticle

28 Citations (Scopus)


Several poly(methyl methacrylate) samples of different molecular weight and dispersity were prepared and studied by positron lifetime spectroscopy. According to the lifetime measurements, the free volume holes were smaller and their distribution was narrower in monodisperse PMMA samples than in polydisperse samples. On the other hand, density measurements revealed that the overall free volume fractions are identical in both kinds of samples. To check these results, we constructed a model for the polymer structure and calculated free volume distributions in it. Theoretical results have not shown dispersity-dependent free volume distributions which suggested that the structure of compressed PMMA pellets differs from the ideal interaction-free structure considered in calculations. This latter result emphasizes the role of entanglements in the formation of the polymer structure.

Original languageEnglish
Pages (from-to)1147-1151
Number of pages5
Issue number4
Publication statusPublished - Feb 23 1999

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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