Polymeric Degrees of Freedom Do Matter
Polymer Melts, Elastomers, Collapsed Polymer Globules, Chromosome Territories etc
Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
The role of topological constraints on conformational as well as relaxational and dynamical properties of open linear and closed ring polymers as well as mixtures thereof is discussed. In the case of polymer melts the conformational statistics can be used to directly determine the entanglement molecular weight in excellent agreement to experiment. By manipulating the entanglements through non-equilibrium processes in long chain melts materials with new rheological properties can be obtained. For ring polymers the situation is completely different. While linked rings act like DeGennes’ Olympic gels, we find that non concatenated polymer rings segregate and form individual “collapsed” objects. I discuss some details of their conformations, which not only is related to one of the very basic problems in polymer science but also has far reaching consequences from the collapse of gels to chromosome territories. Furthermore chain length effects play a decisive role when it comes to structure formation in driven systems.
J. D. Halverson, J. Smrek, K. Kremer and A. Yu Grosberg, From a melt of rings to chromosome territories: the role of topological constraints in genome folding. Rep. Prog. Phys. 77 (2014)
G. Zhang, T. Stuehn, K. Ch. Daoulas, K. Kremer, Communication: One size fits all: Equilibrating chemically different polymer liquids through universal long-wavelength description J. Chem. Phys. 142, 221102 (2015)
H. P. Hsu, K. Kremer, Static and dynamic properties of large polymer melts in equilibrium. J. Chem. Phys. 144, 154907 (2016) J. Smrek, K. Kremer, Small Activity Differences Drive Phase Separation in Active-Passive Polymer Mixtures, PRL 116, 098002 (2017)