Dynamic structure factor of diblock copolymer solutions in the disordered state. 2. Effect of composition polydispersity

P. Holmqvist, S. Pispas, R. Sigel, Nikolaos Hadjichristidis*, G. Fytas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The dynamic structure factor of entangled solutions of one symmetric and two asymmetric high molar mass styrene-b-ethylene-alt-propylene (SEP) and the parent styrene-b-isoprene (SI) diblock copolymers in the common solvent toluene was thoroughly studied by photon correlation spectroscopy. The incomplete hydrogenation transforms the I-block of SI into a random heteropolymer block. In turns out that this acts as enhanced composition polydispersity on both static and dynamic structure factor. In the mean-field regime of the disordered phase, the decay of the composition fluctuations in SI and SEP changes from a pure relaxational (q-independent rate) for SI to a pure diffusive (q2-dependent rate) character for SEP in a controlled way.

Original languageEnglish (US)
Pages (from-to)3157-3163
Number of pages7
JournalMacromolecules
Volume35
Issue number8
DOIs
StatePublished - Apr 9 2002

ASJC Scopus subject areas

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

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