Single-Molecule Measurement of the Strength of a Siloxane Bond
| Autor: | Peter Schwaderer, Johann Weis, Jens Michaelis, Enno Funk, Christoph Bräuchle, Frank Achenbach |
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| Rok vydání: | 2007 |
| Předmět: |
chemistry.chemical_classification
Quantitative Biology::Biomolecules Polydimethylsiloxane Bond Force spectroscopy Surfaces and Interfaces Polymer Condensed Matter Physics Condensed Matter::Soft Condensed Matter chemistry.chemical_compound chemistry Covalent bond Chemical physics Siloxane Electrochemistry Physical chemistry Molecule General Materials Science Density functional theory Spectroscopy |
| Zdroj: | Langmuir. 24:1343-1349 |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/la702352x |
| Popis: | Increasing the mechanical stability of artificial polymer materials is an important task in materials science, and for this a profound knowledge of the critical mechanoelastic properties of its constituents is vital. Here, we use AFM-based single-molecule force spectroscopy measurements to characterize the rupture of a single silicon-oxygen bond in the backbone of polydimethylsiloxane as well as the force-extension behavior of this polymer. PDMS is not only a polymer used in a large variety of products but also an important model system for highly flexible polymers. In our experiments, we probe the entire relevant force range from low forces dominated by entropy up to the rupture of the covalent Si-O bonds in the polymer backbone at high forces. The resulting rupture-force histograms are investigated with microscopic models of bond rupture under load and are compared to density functional theory calculations to characterize the free-energy landscape of the Si-O bond in the polymer backbone. |
| Databáze: | OpenAIRE |
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