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Journal of Chemical Physics / Volume 133 / Issue 17 / ARTICLES / Polymers and Complex Systems

J. Chem. Phys. 133, 174905 (2010); http://dx.doi.org/10.1063/1.3505146 (14 pages)

Aggregation of amphiphilic polymers in the presence of adhesive small colloidal particles

Vladimir A. Baulin1,2, Albert Johner3, and Josep Bonet Avalos2

1ICREA, 23 Passeig Lluis Companys, Barcelona 08010, Spain
2Departament d’Enginyeria Química, Universitat Rovira i Virgili, 26 Av. dels Paisos, Catalans, Tarragona 43007, Spain
3Institut Charles Sadron, 23 rue du Loess, Strasbourg 67034, France

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(Received 6 August 2010; accepted 1 October 2010; published online 4 November 2010)

The interaction of amphiphilic polymers with small colloids, capable to reversibly stick onto the chains, is studied. Adhesive small colloids in solution are able to dynamically bind two polymer segments. This association leads to topological changes in the polymer network configurations, such as looping and cross-linking, although the reversible adhesion permits the colloid to slide along the chain backbone. Previous analyses only consider static topologies in the chain network. We show that the sliding degree of freedom ensures the dominance of small loops, over other structures, giving rise to a new perspective in the analysis of the problem. The results are applied to the analysis of the equilibrium between colloidal particles and star polymers, as well as to block copolymer micelles. The results are relevant for the reversible adsorption of silica particles onto hydrophilic polymers, used in the process of formation of mesoporous materials of the type SBA or MCM, cross-linked cyclodextrin molecules threading on the polymers and forming the structures known as polyrotaxanes. Adhesion of colloids on the corona of the latter induce micellization and growth of larger micelles as the number of colloids increase, in agreement with experimental data.

© 2010 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. MODEL
    1. Stickers in linear chains
    2. Stickers in star polymers
      1. One loop on one arm
      2. Several loops on the same arm
      3. m stickers looping in many arms
  3. EQUILIBRIUM BETWEEN COLLOIDAL STICKERS AND A p -ARMED STAR
  4. MICELLES OF POLYMERS WITH STICKERS
  5. CONCLUSIONS

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KEYWORDS and PACS

Keywords

adhesion, adsorption, aggregation, colloids, molecule-molecule reactions, polymer blends

PACS

  • 82.30.Cf

    Atom and radical reactions; chain reactions; molecule-molecule reactions

  • 82.70.Dd

    Colloids

  • 82.33.Nq

    Reactions in micells

  • 68.43.Mn

    Adsorption kinetics

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3505146

PUBLICATION DATA

ISSN

0021-9606 (print)  
1089-7690 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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