Local dynamics of atactic polypropylene across the glass transition

Valeria Arrighi, Roderick Ferguson, R E Lechner, M T F Telling, A Triolo

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

We report a dynamic investigation of the molecular processes in atactic polypropylene using quasi-elastic neutron scattering (QENS). This polymer was investigated over a wide temperature range across the glass transition temperature, Tg, using various QENS spectrometers with different energy resolutions. Below Tg, methyl side group reorientations take place. We have characterized this motion using a model that accounts for a distribution of activation energies. In the melt, where the polymer chain backbone is no longer frozen in, segmental motion occurs. QENS data analysis allows us to identify three distinct molecular processes and we present evidences for the existence of slow dynamics in the melt. © 2001 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)35-43
Number of pages9
JournalPhysica B: Condensed Matter
Volume301
Issue number1-2
DOIs
Publication statusPublished - Jul 2001
Event5th International Workshop on Quasi-Elastic Neutron Scattering - Edinburgh, Scotland, United Kingdom
Duration: 31 Aug 2000 → …

Keywords

  • Atactic polypropylene
  • Methyl group
  • Quasi-elastic neutron scattering
  • Segmental dynamics

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