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Elucidating the impact of extreme nanoscale confinement on segmental and chain dynamics of unentangled poly(cis-1,4-isoprene)

  • Thomas Kinsey
  • Emmanuel Mapesa
  • Tyler Cosby
  • Youjun He
  • Kunlun Hong
  • Yangyang Wang
  • Ciprian Iacob
  • Joshua SangoroEmail author
Regular Article
Part of the following topical collections:
  1. Dielectric Spectroscopy Applied to Soft Matter

Abstract.

Broadband dielectric spectroscopy is employed to probe dynamics in low molecular weight poly(cis-1,4-isoprene) (PI) confined in unidirectional silica nanopores with mean pore diameter, D, of 6.5 nm. Three molecular weights of PI (3, 7 and 10 kg/mol) were chosen such that the ratio of D to the polymer radius of gyration, Rg, is varied from 3.4, 2.3 to 1.9, respectively. It is found that the mean segmental relaxation rate remains bulk-like but an additional process arises at lower frequencies with increasing molecular weight (decreasing D/Rg. In contrast, the mean relaxation rates of the end-to-end dipole vector corresponding to chain dynamics are found to be slightly slower than that in the bulk for the systems approaching D/Rg ∼ 2, but faster than the bulk for the polymer with the largest molecular weight. The analysis of the spectral shapes of the chain relaxation suggests that the resulting dynamics of the 10kg/mol PI confined at length-scales close to that of the Rg are due to non-ideal chain conformations under confinement decreasing the chain relaxation times. The understanding of these faster chain dynamics of polymers under extreme geometrical confinement is necessary in designing nanodevices that contain polymeric materials within substrates approaching the molecular scale.

Graphical abstract

Keywords

Topical issue: Dielectric Spectroscopy Applied to Soft Matter 

Notes

Supplementary material

10189_2019_759_MOESM1_ESM.pdf (378 kb)
Elucidating the impact of extreme nanoscale confinement on segmental and chain dynamics of unentangled poly(cis-1,4-isoprene)

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Copyright information

© EDP Sciences / Società Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Thomas Kinsey
    • 1
  • Emmanuel Mapesa
    • 1
  • Tyler Cosby
    • 1
  • Youjun He
    • 2
  • Kunlun Hong
    • 2
  • Yangyang Wang
    • 2
  • Ciprian Iacob
    • 3
    • 4
  • Joshua Sangoro
    • 1
    Email author
  1. 1.Department of Chemical and Biomolecular EngineeringUniversity of TennesseeKnoxvilleUSA
  2. 2.Center for Nanophase Materials ScienceOak Ridge National LaboratoryOak RidgeUSA
  3. 3.National Research and Development Institute for Cryogenic and Isotopic Technologies, ICSI Rm. ValceaRm. ValceaRomania
  4. 4.Karlsruhe Institute of Technology (KIT)Institute for Chemical Technology and Polymer ChemistryKarlsruheGermany

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