Volume 47, Number 6, September II 1999
|Page(s)||675 - 680|
|Section||Atomic and molecular physics|
|Published online||01 September 2002|
Escape transition of a compressed polymer mushroom under good solvent conditions
Institut für Physik, Johannes-Gutenberg-Universität Staudinger Weg 7, D-55099 Mainz, Germany
2 Institute for Physical Chemistry, Bulgarian Academy of Sciences - 1113, Sofia, Bulgaria
3 Max-Planck-Institut für Polymerforshung Ackermannweg 10, D-55128, Mainz, Germany
Accepted: 12 July 1999
The escape transition of a flexible polymer chain of chain length N, endgrafted at a hard wall and compressed by a piston of radius R, is studied by Monte Carlo simulation and by phenomenological arguments. In contrast to previous theories which have considered the transition as a function of a (fixed) height H of the piston above the wall, we consider the transition as a function of the conjugate variable, the force f acting on the piston. We find that the transition (which is sharp only for ) is characterized by a flat region of f in the f vs. H isotherm, i.e. a jump in the height occurs at the transition from to , with .
PACS: 36.20.-r – Macromolecules and polymer molecules / 36.20Ey – Conformation (statistics and dynamics) / 82.45.+z – Electrochemistry and electrophoresis
© EDP Sciences, 1999
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