Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 142, Issue 16, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4919295
Keywords
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Funding
- RFBR [12-03-01137-a, 09-03-91344-NNIO-a, 13-03-91331-NNIO-a]
- DFG [436 RUS 113/863/02]
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We study force-extension curves of a single semiflexible chain consisting of several rigid rods connected by flexible spacers. The atomic force microscopy and laser optical or magnetic tweezers apparatus stretching these rod-coil macromolecules are discussed. In addition, the stretching by external isotropic force is analyzed. The main attention is focused on computer simulation and analytical results. We demonstrate that the force-extension curves for rod-coil chains composed of two or three rods of equal length differ not only quantitatively but also qualitatively in different probe methods. These curves have an anomalous shape for a chain of two rods. End-to-end distributions of rod-coil chains are calculated by Monte Carlo method and compared with analytical equations. The influence of the spacer's length on the force-extension curves in different probe methods is analyzed. The results can be useful for interpreting experiments on the stretching of rod-coil block-copolymers. (C) 2015 AIP Publishing LLC.
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