Elasticity of Single Polymer Chains

Telechelic polymer chains (hydrophobic end-capped poly(ethylene oxide)) linked to a hydrophobic surface were probed with the atomic force microscope tip by vertical stretching. Under conditions that allowed only a limited number of molecular chains to interact with the hydrophobic atomic force micro...

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Bibliographic Details
Published in:Macromolecules 1999-07, Vol.32 (15), p.4989-4992
Main Authors: Maaloum, M, Courvoisier, A
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Surface properties
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Summary:Telechelic polymer chains (hydrophobic end-capped poly(ethylene oxide)) linked to a hydrophobic surface were probed with the atomic force microscope tip by vertical stretching. Under conditions that allowed only a limited number of molecular chains to interact with the hydrophobic atomic force microscope tip, the gradient of the forces was found to be quantized in integer multiples of 540 ± 30 and 330 ± 25 μN/m for polymers of mass 20 000 and 35 000, respectively. The measured force gradient quanta is interpreted as the stiffness of a single polymer chain. This work may shed new light on macromolecules at interfaces involving chain extensions and opens the route for elasticity studies of single macromolecules.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma981023p