Mechanical spectral hole burning in polymer solutions

Qian Qin, Hiroko Doen, Gregory B. Mckenna

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Mechanical Spectral Hole Burning (MSHB) was previously developed to investigate dynamic heterogeneity for polymeric materials, which exhibit relatively weak dielectric responses. In our previous work, MSHB was applied to a densely entangled block copolymer and successfully distinguishes the heterogeneous from the homogeneous states. Here, a series of polystyrene (PS) solutions was chosen to further investigate the effect of different types of heterogeneity on mechanical spectral hole burning. The three types of heterogeneity of interest include the entanglement spacing, the entanglement density (or number of entanglements per chain), and chain end density. The heterogeneity was varied by changing either solution concentration or molecular weight of the PS. Different types of dynamics from close to the Rouse regime into the terminal region were also examined. Our results are consistent with a heterogeneous dynamics over the time scales from close to Rouse regime into the rubbery plateau regime and the rubbery plateau-to-terminal flow transition regime. Terminal relaxation dynamics, on the other hand, were found to be homogeneous for the PS/diethyl phthalate solutions investigated. The results also indicate the hole properties are dominated by the type of dynamics rather than the length scale of heterogeneity.

Original languageEnglish
Pages (from-to)2047-2062
Number of pages16
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume47
Issue number20
DOIs
StatePublished - Oct 15 2009

Keywords

  • Dynamic heterogeneity
  • Dynamics
  • Heterogeneity
  • Hole burning
  • Hole burning spectroscopy
  • Length scale
  • MSHB
  • Nonlinear
  • Polymer rheology
  • Polymer solution
  • Polystyrene
  • Viscoelasticity

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