Component dynamics in polyisoprene/polyvinylethylene blends well above Tg

Bumchan Min, Xiao Hua Qiu, M. D. Ediger*, Marinos Pitsikalis, Nikolaos Hadjichristidis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

80 Scopus citations

Abstract

13C and 2H NMR relaxation time measurements were performed on low molecular weight blends of polyisoprene (Mn = 1350 g/mol) and deuterated polyvinylethylene (1,2-polybutadiene; Mn = 2350 g/mol) in order to extract the segmental correlation times for each component. A wide range of temperatures (295-405 K) and several compositions (PI/dPVE: 100/0, 70/30, 50/50, 30/70, and 0/100) were investigated. At high temperatures, dPVE dynamics are 6 times slower than PI dynamics even after considering self-concentration effects. This intrinsic mobility difference is in quantitative agreement with measurements on each chain individually as a dilute component in a common solvent, suggesting a purely intramolecular origin. The reported correlation times at various compositions fit together smoothly with those obtained by Kornfield and co-workers near Tg, thus providing a unified data set for testing models. One model based on local composition fluctuations captures some qualitative features of the experimental data while failing to describe others.

Original languageEnglish (US)
Pages (from-to)4466-4475
Number of pages10
JournalMacromolecules
Volume34
Issue number13
DOIs
StatePublished - Jun 19 2001

ASJC Scopus subject areas

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

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