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Polymer Loops vs. Brushes on Surfaces: Adsorption, Kinetics, and Viscoelastic Behavior of α,ω-Thiol Telechelics on Gold

  1. Derek Patton1,2,
  2. Wolfgang Knoll3,
  3. Rigoberto C. Advincula1,*

Article first published online: 27 DEC 2010

DOI: 10.1002/macp.201000524

Issue

Macromolecular Chemistry and Physics

Macromolecular Chemistry and Physics

Volume 212, Issue 5, pages 485–497, March 1, 2011

Additional Information

How to Cite

Patton, D., Knoll, W. and Advincula, R. C. (2011), Polymer Loops vs. Brushes on Surfaces: Adsorption, Kinetics, and Viscoelastic Behavior of α,ω-Thiol Telechelics on Gold. Macromol. Chem. Phys., 212: 485–497. doi: 10.1002/macp.201000524

Author Information

  1. 1

    Department of Chemistry and Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX 77204-5003, USA

  2. 2

    Current address: School of Polymers and High Performance Materials, University of Southern Mississippi, Hattiesburg, MS 39406, USA

  3. 3

    Austrian Institute of Technology (AIT) GmbH, Donau-City-Straße 1, 1220 Vienna, Austria

*Department of Chemistry and Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX 77204-5003, USA.

Publication History

  1. Issue published online: 21 FEB 2011
  2. Article first published online: 27 DEC 2010
  3. Manuscript Revised: 23 OCT 2010
  4. Manuscript Received: 12 SEP 2010

Funded by

  • NSF. Grant Numbers: DMR-10-06776, CHE-03-04807, CBET-0854979, CHE-1041300, NHARP 01846
  • Robert A. Welch Foundation. Grant Number: E-1551

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Keywords:

  • adsorption;
  • self-assembly;
  • telechelics;
  • viscoelastic properties

Abstract

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Telechelic thiopolymers were explored towards formation of doubly-bound (polymer loops) vs. singly-bound (polymer brushes) chains on gold substrates. The conformation, adsorption kinetics, and viscoelastic properties of the α,ω-dithiol and monothiol PS telechelics were investigated by means of XPS and QCM-D techniques. The oxidation behavior of the free thiol proved to be important for distinguishing doubly-bound vs. singly-bound chains. The results show a critical dependence of equation image on the ability to obtain polymer loops. Comparison with unperturbed dimensions obtained by scaling theory show that the loop is less stretched and occupies more lateral space than the brush. The results are important in demonstrating the different and perhaps superior properties of polymer loops vs. singly-bound polymer brushes.

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