期刊
JOURNAL OF APPLIED PHYSICS
卷 107, 期 6, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3343265
关键词
hydrogels; stress relaxation
资金
- National Science Foundation [0800161]
- NIH/NIDCR [R37DE013033]
- Materials Research Science and Engineering Center (MRSEC) at Harvard University
- American Academy of Mechanics
- Robert M. and Mary Haythornthwaite Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0800161] Funding Source: National Science Foundation
Long-chained polymers in alginate hydrogels can form networks by either ionic or covalent crosslinks. This paper shows that the type of crosslinks can markedly affect the stress-relaxation behavior of the gels. In gels with only ionic crosslinks, stress relaxes mainly through breaking and subsequent reforming of the ionic crosslinks, and the time scale of the relaxation is independent of the size of the sample. By contrast, in gels with only covalent crosslinks, stress relaxes mainly through migration of water, and the relaxation slows down as the size of the sample increases. Implications of these observations are discussed.
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