Regular Star Polymers with 64 and 128 Arms. Models for Polymeric Micelles

Jacques Roovers, Lin Lin Zhou*, Paul M. Toporowski, Mark van der Zwan, Hermes Iatrou, Nikolaos Hadjichristidis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

378 Scopus citations

Abstract

Carbosilane dendrimers with 64 and 128 surface Si-Cl bonds were used as coupling reagents for monodisperse poly(butadienyl)lithium. Two series of regular star polybutadienes with 64 and 128 arms were prepared. The arm molecular weight was varied between 6400 and 72 000. The dilute-solution properties of the stars were determined in a good solvent (cyclohexane) and in a θ-solvent (dioxane) for polybutadiene. Measurements of RG, A2, D0, and [η] indicate that the isolated stars behave as hard spheres. The ratio of the hydrodynamic radius over the radius of gyration is slightly larger than (5/3)1/2. In a comparison which includes previously made stars with lower functionality, it is found that [formula omitted] in the good solvent and f−0.64 in the θ-solvent. The former result is in good agreement with the Daoud-Cotton scaling model of stars. The latter dependence is stronger than the theory predicts: gθ ∝ f−0.5. A recent quantitative model developed by Gast et al. for polymeric micelles is in good agreement with the present experimental data. Stars with many arms represent good model polymers for polymeric micelles.

Original languageEnglish (US)
Pages (from-to)4324-4331
Number of pages8
JournalMacromolecules
Volume26
Issue number16
DOIs
StatePublished - Jan 1 1993

ASJC Scopus subject areas

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

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