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Stress-relaxation behavior in gels with ionic and covalent crosslinks
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10.1063/1.3343265
/content/aip/journal/jap/107/6/10.1063/1.3343265
http://aip.metastore.ingenta.com/content/aip/journal/jap/107/6/10.1063/1.3343265
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Figures

Image of FIG. 1.
FIG. 1.

Long-chained polymers of sodium alginate can form a network by (a) ionic crosslinks, , or by (b) covalent crosslinks, adipic acid dihydrazide (AAD).

Image of FIG. 2.
FIG. 2.

(a) Schematic of a stress-relaxation test. A disk of a gel is immersed in a PBS solvent and placed between two impermeable rigid plates. A strain is suddenly applied to the gel. (b) Subsequently, the strain is held constant, while the stress is recorded as a function of time.

Image of FIG. 3.
FIG. 3.

The stress-relaxation behavior of a gel with ionic crosslinks, and of a gel with covalent crosslinks. The two gels have a similar elastic modulus, but very different relaxation times.

Image of FIG. 4.
FIG. 4.

Photographs of gels before and after deformation. The gels were subjected to the stress relaxation test. After the test, the load was removed to allow the gels to recover. (a) For a gel with covalent crosslinks, deformation fully recovers after the load is removed. (b) For a gel with ionic crosslinks, part of the deformation is permanent after the load is removed.

Image of FIG. 5.
FIG. 5.

The weights of ionic and covalent gel disks before the stress-relaxation test, right after the test, and after storing in PBS for 24 h.

Image of FIG. 6.
FIG. 6.

(a) For gels with ionic crosslinks, the stress-relaxation behavior is independent of the radius of the disk. (b) For gels with covalent crosslinks, the relaxation slows down as the radius of the disk increases. The radius of the disk, however, does not affect the levels of the stress at short and long times.

Image of FIG. 7.
FIG. 7.

The effect of the radius of the disk on the stress-relaxation behavior of a gel with covalent crosslinks. When the of stress is plotted as a function of , the curves for the disks of different radii collapse into a single curve.

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/content/aip/journal/jap/107/6/10.1063/1.3343265
2010-03-23
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Stress-relaxation behavior in gels with ionic and covalent crosslinks
http://aip.metastore.ingenta.com/content/aip/journal/jap/107/6/10.1063/1.3343265
10.1063/1.3343265
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