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Adsorption-induced Scission of Carbon–carbon Bonds by Sergei S. Sheiko; Frank C. Sun; Adrian Randall; David Shirvanyants; Michael Rubinstein; Hyung-il Lee; Krzysztof Matyjaszewski is a Physics and Astronomy article available to read on EtoBox.

What is Adsorption-induced Scission of Carbon–carbon Bonds about?

Covalent carbon-carbon bonds are hard to break. Their strength is evident in the hardness of diamonds 1,2 and tensile strength of polymeric fibres ; on the single-molecule level, it manifests itself in the need for forces of several nanonewtons to extend and mechanically rupture one bond. Such forces have been generated using extensional flow 7-9 , ultrasonic irradiation 10 , receding meniscus 11 and by directly stretching a single molecule with nanoprobes . Here we show that simple adsorption of brush-like macromolecules with long side chains on a substrate can induce not only conformational deformations 17 , but also spontaneous rupture of covalent bonds in the macromolecular backbone. We attribute this behaviour to the fact that the attractive interaction between the side chains and the substrate is maximized by the spreading of the side chains, which in turn induces tension along the polymer backbone. Provided the side-chain densities and substrate interaction are sufficiently high, the tension generated will be strong enough to rupture covalent carbon-carbon bonds. We expect similar adsorption-induced backbone scission to occur for all macromolecules with highly branched archi

Who reads Adsorption-induced Scission of Carbon–carbon Bonds?

Author

Sergei S. Sheiko; Frank C. Sun; Adrian Randall; David Shirvanyants; Michael Rubinstein; Hyung-il Lee; Krzysztof Matyjaszewski

Publisher

Springer Science and Business Media LLC

Published

2006

Language

EN

Field

Physics and Astronomy (Physical Sciences)