2014
DOI: 10.1021/ma500446g
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Tuning Cross-Link Density in a Physical Hydrogel by Supramolecular Self-Sorting

Abstract: Cross-link density is an important parameter for the macroscopic mechanical properties of hydrogels. Increasing network density leads to an increase in the storage and loss moduli of the gel and can be accomplished by either increasing the concentration of cross-linkers, or by reducing the fraction of mechanically inactive cross-links. Mechanically inactive crosslinks consist of loops in the network, which do not contribute to the mechanical properties. Suppression of loop formation is demonstrated in a system… Show more

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Cited by 41 publications
(37 citation statements)
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“…Strategies to control the size and shape of nano-and micrometer size objects that rely on selective solvent techniques in the self-assembly of block copolymers will not be discussed here. [60][61][62][63][64][65][66][67][68][69][70][71][72][73] Supramolecular multicomponent gels, [74][75][76][77][78][79][80][81][82][83][84][85][86][87][88][89] or orthogonal self-assembly, [90][91][92][93][94][95][96][97] self-sorting [98][99][100][101][102][103][104] and chiral amplification strategies 105 in multicomponent supramolecular polymers will not be covered in detail, and the interested reader is referred to the recent literature and review articles.…”
mentioning
confidence: 99%
“…Strategies to control the size and shape of nano-and micrometer size objects that rely on selective solvent techniques in the self-assembly of block copolymers will not be discussed here. [60][61][62][63][64][65][66][67][68][69][70][71][72][73] Supramolecular multicomponent gels, [74][75][76][77][78][79][80][81][82][83][84][85][86][87][88][89] or orthogonal self-assembly, [90][91][92][93][94][95][96][97] self-sorting [98][99][100][101][102][103][104] and chiral amplification strategies 105 in multicomponent supramolecular polymers will not be covered in detail, and the interested reader is referred to the recent literature and review articles.…”
mentioning
confidence: 99%
“…[36] A comparison of the hydrazone-forming reaction between gelator components at pH 5 and 7 showed distinct changes in the mechanical properties of the network consistent with differences in the hydrogel microstructure, thus demonstrating the importance of reaction rate on this process. [7,[10][11][12][13][14][15] Commonly, the addition of polymeric crosslinkers results in an improvement of the material's mechanical properties; however, competition between intraand interfibrillar crosslinking can occur preventing them from reaching their full mechanical potential. We became thus interested in studying the effect of various (bio)polymeric crosslinkers on the selfassembly process of this reaction-coupled hydrazide-aldehyde gelator into hydrogel materials as a model system (Scheme 1).…”
mentioning
confidence: 99%
“…61 Currently, several strategies to improve hydrogel toughness have been introduced, such as the addition of chemical crosslinkers to provide permanent cross-linked networks, the combined use of multiple noncovalent interactions to enhance the cooperative effect between the cross-linkages, and the introduction of inorganic nanomaterials to produce organicinorganic hybrid cross-linked structures. In contrast, the 3D noncovalent crosslinked networks of supramolecular hydrogels show unique mechanical properties, including both stiffness/toughness and elasticity/flexibility to retain the hydrogel structure.…”
Section: Mechanical Propertiesmentioning
confidence: 99%