72 citations · 506 across the 15 of their papers we have counts for
12 papers · 1 filter
Competing exchange and irreversible reactions in a linear co-polycondensation lead to a broad composition window where tunable high molecular weight polymers can be prepared
Michael Lang, Frank Böhme
A co-polycondensation reaction is discussed analytically and by Monte-Carlo simulations where two reactive units compete for reactions with an alternating third reactive unit, wher…
Fluctuation driven height reduction of crosslinked polymer brushes
M. Lang, M. Hoffmann, M. Werner +2
We study the changes in the conformations of brushes upon the addition of crosslinks between the chains using the bond fluctuation model. The Flory-Rehner model applied to uni-axia…
Excluded volume effects in polymer brushes at moderate chain stretching
Dirk Romeis, Michael Lang
We develop a strong stretching approximation for a polymer brush made of self-avoiding polymer chains. The density profile of the brush and the distribution of the end monomer posi…
Arm retraction dynamics in dense polymer brushes
Michael Lang, Marco Werner, Ron Dockhorn +1
Large scale Monte Carlo simulations of dense layers of grafted polymer chains in good solvent conditions are used to explore the relaxation of a polymer brush. Monomer displacement…
Effect of Topology on the Conformations of Ring Polymers
Michael Lang, Jakob Fischer, Jens-Uwe Sommer
The bond fluctuation method is used to simulate both non-concatenated entangled and interpenetrating melts of ring polymers. We find that the swelling of interpenetrating rings upo…
Elasticity of Phantom Model Networks with Cyclic Defects
Michael Lang
The impact of finite cycles on the phantom modulus in an otherwise perfect network is computed exactly. It is shown that pending cycles reduce the phantom modulus of the network by…
Short Cyclic Structures in Polymer Model Networks: A Test of Mean Field Approximation by Monte Carlo Simulations
Michael Lang, Konrad Schwenke, Jens-Uwe Sommer
A mean field rate theory description of the homo- and co-polymerization of -functional molecules is developed, which contains the formation of short cyclic structures inside the…
On the Structure of Star-Polymer Networks
Konrad Schwenke, Michael Lang, Jens-Uwe Sommer
Using the bond fluctuation model we study polymer networks obtained by endlinking of symmetric 4-arm star polymers. We consider two types of systems. Solutions of one type (A) of s…
Monomer Fluctuations and the Distribution of Residual Bond Orientations in Polymer Networks
Michael Lang
In the present work, four series of simulations are analyzed: entangled model networks of a) mono-disperse or b) poly-disperse weight distribution between the crosslinks, c) non-en…
Ring conformations in bidisperse blends of ring polymers
Michael Lang
The size of rings (also called cyclic polymers) in bidisperse blends of chemically identical rings is analyzed by computer simulations. Data of entangled ring blends and blends of…
On the Elasticity of Polymer Model Networks Containing Finite Loops
Michael Lang
Based upon the resistor analogy and using the ideal loop gas approximation(ILGA) it is shown that only pending loops reduce the modulus of an otherwise perfect network made of mono…
Olympic Gels: Concatenation and Swelling
Michael Lang, Jakob Fischer, Marco Werner +1
Concatenation and equilibrium swelling of Olympic gels, which are composed of entangled cyclic polymers, is studied by Monte Carlo Simulations. The average number of concatenated m…