Self-diffusivity in block copolymer solutions. 2. A2B simple grafts

S. H. Anastasiadis*, K. Chrissopoulou, G. Fytas, G. Fleischer, S. Pispas, M. Pitsikalis, J. W. Mays, Nikolaos Hadjichristidis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The composition and concentration dependencies of the self-diffusion coefficients for a series of miktoarm star block copolymers of the A2B type in solutions in a common good solvent have been investigated by pulsed-field-gradient nuclear magnetic resonance; the graft copolymers are composed of A = polyisoprene and B = polystyrene, where the B block was attached either in the middle of the A block (τ = 0.5) or at a position with τ = 0.25. The dependence of the diffusion coefficients on concentration, in both A2B graft copolymers and AB diblock copolymers, can be collapsed onto a master curve with a proposed scaling procedure which takes into account the difference in the entanglement characteristics of the parent homopolymers and the different radii of gyration of stars vs linear polymers. The exponential slowing down of the diffusivities expected for star molecules was not observed due to the only moderately high molecular weights and concentrations.

Original languageEnglish (US)
Pages (from-to)2445-2453
Number of pages9
JournalMacromolecules
Volume30
Issue number8
StatePublished - Apr 21 1997

ASJC Scopus subject areas

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

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