Journal article
Non-additive impacts of covalent cross-linking on the viscoelastic nanomechanics of ionic polyelectrolyte complexes
RSC advances, v 7(84), pp 53334-53345
2017
Abstract
This study elucidates the influences of adding covalent cross-linking on the nanomechanical viscoelasticity of ionically cross-linked polyelectrolyte networks. Using layer-by-layer (LbL) assembled PAH/PAA networks, we report how adding covalent amide cross-links changes the degree of swelling, indentation modulus, and force relaxation behaviors with varying solution conditions such as pH and ionic strength, which modulate the ionic cross-link density and fixed charge density. The addition of covalent cross-linking increases both the modulus and degree of elasticity through providing permanent anchorage to the ionically linked networks. Such addition also strongly increases the relaxation times at net neutral, less swollen states. These results together underscore the synergistic interplay between the covalent and ionic cross-links in the viscoelastic nanomechanics of polyelectrolyte networks, potentially enabling the use of these stimulus-responsive materials in mechano-sensitive biomedical and engineering applications.
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9 citations in Scopus
Details
- Title
- Non-additive impacts of covalent cross-linking on the viscoelastic nanomechanics of ionic polyelectrolyte complexes
- Creators
- Biao Han - School of Biomedical Engineering, Science, and Health Systems, Drexel University, Philadelphia, USATianzhu Ma - School of Biomedical Engineering, Science, and Health Systems, Drexel University, Philadelphia, USAJohn H Vergara - Department of Chemical and Biological Engineering, Drexel University, Philadelphia, USAGiuseppe R Palmese - Department of Chemical and Biological Engineering, Drexel University, Philadelphia, USAJie Yin - Department of Mechanical Engineering, Temple University, Philadelphia, USADaeyeon Lee - Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, USALin Han - School of Biomedical Engineering, Science, and Health Systems, Drexel University, Philadelphia, USA
- Publication Details
- RSC advances, v 7(84), pp 53334-53345
- Publisher
- Royal Society of Chemistry
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- School of Biomedical Engineering, Science, and Health Systems; Chemical and Biological Engineering
- Scopus ID
- 2-s2.0-85035109833
- Other Identifier
- 991014878535104721