Miscible blend dynamics and the length scale of local compositions

Victoria García Sakai, Janna K. Maranas, Zema Chowdhuri, Inmaculada Peral, John R.D. Copley

Research output: Contribution to journalArticle

32 Scopus citations

Abstract

We consider the influence of a local, or effective, composition on dynamics in the miscible polymer blend PEO/PMMA. Quasielastic neutron scattering in combination with deuterium labeling is employed to determine characteristic relaxation times of the PEO component over spatial scales from 3 to 10 Å. Information about the distribution of relaxation times is obtained indirectly from the stretching parameters in a stretched exponential fit. We examine the behavior of these parameters with spatial scale and temperature, finding that their variation supports a distribution of PEO mobility in the blend which is far wider than pure PEO and narrows with decreasing temperature for small spatial scales. This is linked to the concept of local compositions defined over varying spatial scales, and indicates that the concept of a local composition, linked to PEO dynamics, is important in this system.

Original languageEnglish (US)
Pages (from-to)2914-2923
Number of pages10
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume43
Issue number20
DOIs
StatePublished - Oct 15 2005

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Miscible blend dynamics and the length scale of local compositions'. Together they form a unique fingerprint.

  • Cite this