Elastische Eigenschaften von Polymernetzwerken [E-Book]
Elastische Eigenschaften von Polymernetzwerken [E-Book]
Polymers are long chain molecules with important biological and technical applications. By introducing additional chemical bonds they can be crosslinked into networks. Subject of this thesis is the statistical mechanical treatment of the elastic properties of polymers and polymer networks. In the fi...
Saved in:
Personal Name(s): | Everaers, Ralf (Corresponding author) |
---|---|
Contributing Institute: |
Institut für Festkörperforschung; IFF |
Imprint: |
Jülich
Forschungszentrum
1995
|
Physical Description: |
II, 177 S. |
Document Type: |
Report |
Series Title: |
Berichte des Forschungszentrums Jülich
3040 |
Subject (ZB): | |
Link: |
OpenAccess |
Publikationsportal JuSER |
Polymers are long chain molecules with important biological and technical applications. By introducing additional chemical bonds they can be crosslinked into networks. Subject of this thesis is the statistical mechanical treatment of the elastic properties of polymers and polymer networks. In the first part the first computer simulations of strained polymer networks are used to clarify the physical foundations of rubber elasticity. We investigate idealized model networks with a diamond lattice connectivity. By modifying the interaction potentials it is possible to simulate ensembles with and without topology conservation. The key element of the argumentation is the simultaneous measurement of the macroscopic restoring forces due to deformations and of those microscopic quantities from which the elastic properties are deduced in theories of rubber elasticity. It is shown that the classical moduli calculated from the change in the end-to-end distance distributions for the network strands are significantly smaller than the true moduli. To test a topological theory of rubber elasticity we determine the linking state for all pairs of meshes in the system. Using a distance dependent free energy for linked meshes the linking contribution to the modulus can be estimated within an affine approximation. The result is found to be in excellent agreement with the measured topology contribution. |