The Extension of Rod-Coil Multiblock Copolymers and the Effect of the Helix-Coil Transition

Details The Extension of Rod-Coil Multiblock Copolymers and the Effect of the Helix-Coil Transition The Extension of Rod-Coil Multiblock Copolymers and the Effect of the Helix-Coil Transition

1999-09-21

arxiv.org/abs/cond-mat/9909309v1

Phys. Rev. Lett. 84, 2160-2163 (2000)

Physics

Condensed Matter

Soft Condensed Matter

4 pages and 1 figure

Scientific paper

10.1103/PhysRevLett.84.2160

The extension elasticity of rod-coil mutliblock copolymers is analyzed for two experimentally accessible situations. In the quenched case, when the architecture is fixed by the synthesis, the force law is distinguished by a sharp change in the slope. In the annealed case, where interconversion between rod and coil states is possible, the resulting force law is sigmoid with a pronounced plateau. This last case is realized, for example, when homopolypeptides capable of undergoing a helix-coil transition are extended from a coil state. Both scenarios are relevant to the analysis and design of experiments involving single molecule mechanical measurements of biopolymers and synthetic macromolecules.

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