Force–Reactivity Property of a Single Monomer Is Sufficient To Predict the Micromechanical Behavior of Its Polymer
摘要:
We demonstrate an accurate prediction of the micromechanical behavior of a single chain of cydopropanated polybutadiene, which is governed by rapid isomerization of the cyclopropane moieties at similar to 1.2 nN, from the force rate correlation of this reaction measured in a small series of increasingly strained macrocycles. The data demonstrate that a single physical quantity, force, uniquely defines the dynamics across length scales from >100 to <1 nm and that strain imposed through molecular design and that imposed by micromanipulation techniques have equivalent effects on the kinetics of a chemical reaction. This represents a new method of screening potential monomers for applications in stress-responsive materials that could also facilitate atomistic interpretations of single-molecule force experiments.
Kinetics of Thiol/Disulfide Exchange Correlate Weakly with the Restoring Force in the Disulfide Moiety
作者:Timothy J. Kucharski、Zhen Huang、Qing-Zheng Yang、Yancong Tian、Nicholas C. Rubin、Carlos D. Concepcion、Roman Boulatov
DOI:10.1002/anie.200901511
日期:2009.9.7
series of increasingly strained macrocyclic disulfides investigated experimentally and by high‐level DFT calculations reveals that the kinetics of thiol/disulfideexchange are independent of the restoringforce in the disulfidemoiety. This finding is consistent with the SN2 mechanism of thiol/disulfideexchange and lends insight into the acceleration of disulfide reduction upon stretching of certain proteins