Investigations of the structure and conformations of star-shaped polymers with fullerene branching centers: Polystyrenes with different structures and functionalities of the C60 centers in toluene

V. T. Lebedev, G. Török, L. V. Vinogradova

Research output: Contribution to journalArticle

Abstract

The structure of regular star-shaped polystyrenes in deuterated toluene with single (C60) and double (C60-C60) branching centers and different numbers of arms (f = 6, 12, 22) has been investigated using small-angle neutron scattering. For functionalities f = 6 and 12, the thermodynamic rigidity and sizes of arms are larger than the corresponding characteristics of the linear polystyrene precursor; however, for f = 22, the situation reverses: the flexibility increases, the arms are compressed, and the radius of gyration of the stars decreases. The stars transform into dense spherical aggregates, the behavior of which is inconsistent with the Benoit and Daoud-Cotton theories for structures with a high functionality and Gaussian arms. This is explained by the competition between the structuring effect of the fullerene branching center on the solvent and by the reverse effect of the arms playing the role of defects in an ordered layer of the solvent around the fullerene.

Original languageEnglish
Pages (from-to)190-198
Number of pages9
JournalPhysics of the Solid State
Volume56
Issue number1
DOIs
Publication statusPublished - 2014

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Fullerenes
Polystyrenes
Toluene
fullerenes
Stars
Conformations
toluene
polystyrene
Polymers
stars
polymers
cotton
gyration
Neutron scattering
rigidity
Rigidity
Cotton
flexibility
neutron scattering
Thermodynamics

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

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abstract = "The structure of regular star-shaped polystyrenes in deuterated toluene with single (C60) and double (C60-C60) branching centers and different numbers of arms (f = 6, 12, 22) has been investigated using small-angle neutron scattering. For functionalities f = 6 and 12, the thermodynamic rigidity and sizes of arms are larger than the corresponding characteristics of the linear polystyrene precursor; however, for f = 22, the situation reverses: the flexibility increases, the arms are compressed, and the radius of gyration of the stars decreases. The stars transform into dense spherical aggregates, the behavior of which is inconsistent with the Benoit and Daoud-Cotton theories for structures with a high functionality and Gaussian arms. This is explained by the competition between the structuring effect of the fullerene branching center on the solvent and by the reverse effect of the arms playing the role of defects in an ordered layer of the solvent around the fullerene.",
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PY - 2014

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