Relaxation dynamics of supramolecular polymer networks with mixed cross-linkers
The linear rheological properties of supramolecular polymer networks formed by mixtures of two different bis-Pd(II) cross-linkers with poly(4-vinylpyridine) in dimethyl sulfoxide are examined. The changes in storage and loss moduli of the networks with mixed cross-linkers are compared to those of samples with a single type of cross-linkers. While the plateau moduli, and presumably network topology, of the networks remain equal regardless of the cross-link distribution, the relaxation time contributed by the faster cross-linkers is increased (by a factor of about 1.5 for the specific samples used in this work) by the presence of the slower cross-linkers, while the reverse influences are not significant. This effect can be explained by the fact that a certain fraction of the elastically effective strands cross-linked with fast cross-linkers is pinned on one end by slow cross-linkers, reducing by half the rate of fast chain relaxation. This effect is anticipated to be general for gels with two well-separated relaxation times.
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- Polymers
- 4012 Fluid mechanics and thermal engineering
- 0915 Interdisciplinary Engineering
- 0913 Mechanical Engineering
- 0904 Chemical Engineering
Citation
Published In
DOI
EISSN
ISSN
Publication Date
Volume
Issue
Start / End Page
Related Subject Headings
- Polymers
- 4012 Fluid mechanics and thermal engineering
- 0915 Interdisciplinary Engineering
- 0913 Mechanical Engineering
- 0904 Chemical Engineering