Characterization of stress softening and self-healing in a double network hydrogel
In this paper, a micro-mechanically based constitutive model is presented to describe stress softening and self-healing in alginate-polyacrylamide (PAAm) double network (DN) hydrogels. The stress softening phenomenon in alginate-PAAm DN hydrogels under cyclical deformation is assumed to be the resul...
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| Format: | Article |
| Language: | English |
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Elsevier
2019-03-01
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| Series: | Results in Physics |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211379718333485 |
| _version_ | 1818310566226165760 |
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| author | İsmail Doğan Külcü |
| author_facet | İsmail Doğan Külcü |
| author_sort | İsmail Doğan Külcü |
| collection | DOAJ |
| description | In this paper, a micro-mechanically based constitutive model is presented to describe stress softening and self-healing in alginate-polyacrylamide (PAAm) double network (DN) hydrogels. The stress softening phenomenon in alginate-PAAm DN hydrogels under cyclical deformation is assumed to be the result of the rupture of chain linkages. Therefore, the network evolution method [Dargazany and Itskov, International Journal of Solids and Structures, 2009, 46, 2967] is used to characterize stress softening. The polymer matrix is initially decomposed into reversible and irreversible polymer networks. To model stress softening, the entropic energy of a polymer chain and the chain distribution are taken into account for each network. Unlike conventional DN hydrogels, after deformation alginate-PAAm hydrogels show self-healing. The rate of self-healing is associated with both intermolecular forces and the duration of storage of the samples in a thermal chamber. Broken chain linkages are assumed to rebond due to intermolecular forces and heating. Chemical reaction kinetics and heat transfer equations are utilized to calculate the quantity of the reversible cross-linking rebonding. This model contains few material parameters and demonstrates good agreement with experimental data in stress softening and self-healing. Keywords: Constitutive modeling, Stress softening, Self healing, Rubber-like materials, Tough hydrogels |
| first_indexed | 2024-12-13T07:48:06Z |
| format | Article |
| id | doaj.art-b04b6a2252f94deb8cfc8815d0abf835 |
| institution | Directory Open Access Journal |
| issn | 2211-3797 |
| language | English |
| last_indexed | 2024-12-13T07:48:06Z |
| publishDate | 2019-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Physics |
| spelling | doaj.art-b04b6a2252f94deb8cfc8815d0abf8352022-12-21T23:54:46ZengElsevierResults in Physics2211-37972019-03-011218261833Characterization of stress softening and self-healing in a double network hydrogelİsmail Doğan Külcü0Faculty of Engineering, Turkish-German University, Sahinkaya Cad. 86, 34820 Beykoz/Istanbul, TurkeyIn this paper, a micro-mechanically based constitutive model is presented to describe stress softening and self-healing in alginate-polyacrylamide (PAAm) double network (DN) hydrogels. The stress softening phenomenon in alginate-PAAm DN hydrogels under cyclical deformation is assumed to be the result of the rupture of chain linkages. Therefore, the network evolution method [Dargazany and Itskov, International Journal of Solids and Structures, 2009, 46, 2967] is used to characterize stress softening. The polymer matrix is initially decomposed into reversible and irreversible polymer networks. To model stress softening, the entropic energy of a polymer chain and the chain distribution are taken into account for each network. Unlike conventional DN hydrogels, after deformation alginate-PAAm hydrogels show self-healing. The rate of self-healing is associated with both intermolecular forces and the duration of storage of the samples in a thermal chamber. Broken chain linkages are assumed to rebond due to intermolecular forces and heating. Chemical reaction kinetics and heat transfer equations are utilized to calculate the quantity of the reversible cross-linking rebonding. This model contains few material parameters and demonstrates good agreement with experimental data in stress softening and self-healing. Keywords: Constitutive modeling, Stress softening, Self healing, Rubber-like materials, Tough hydrogelshttp://www.sciencedirect.com/science/article/pii/S2211379718333485 |
| spellingShingle | İsmail Doğan Külcü Characterization of stress softening and self-healing in a double network hydrogel Results in Physics |
| title | Characterization of stress softening and self-healing in a double network hydrogel |
| title_full | Characterization of stress softening and self-healing in a double network hydrogel |
| title_fullStr | Characterization of stress softening and self-healing in a double network hydrogel |
| title_full_unstemmed | Characterization of stress softening and self-healing in a double network hydrogel |
| title_short | Characterization of stress softening and self-healing in a double network hydrogel |
| title_sort | characterization of stress softening and self healing in a double network hydrogel |
| url | http://www.sciencedirect.com/science/article/pii/S2211379718333485 |
| work_keys_str_mv | AT ismaildogankulcu characterizationofstresssofteningandselfhealinginadoublenetworkhydrogel |