Dissipative properties and chain evolution of highly strained nanocomposite hydrogel

Autor:	Yongmao Pei, Jingda Tang, Youyi Sun, Daining Fang, Gao Xu
Rok vydání:	2014
Předmět:	chemistry.chemical_classification Hysteresis Nanocomposite Materials science chemistry Self-healing hydrogels Ultimate tensile strength Dissipative system General Physics and Astronomy Polymer Composite material Dissipation Tensile testing
Zdroj:	Journal of Applied Physics. 116:244901
ISSN:	1089-7550 0021-8979
Popis:	The dissipative property is crucial to the toughness and recovery of hydrogels. In our investigation, systematic uniaxial tension tests were conducted to evaluate the dissipative properties of poly (N-isopropylacrylamide) nanocomposite hydrogels. Two dissipative mechanisms are presented for both small and large stretches. Before yielding, most dissipation results from the orientation of clay platelets along the tensile direction; after yielding, polymer chains peel off from clay platelets to induce hysteresis. For the first time, a quadratic power law between the hysteresis work and the maximum stretch is obtained. The hysteresis work is irrelevant to the detailed loading history. When the hydrogel is unloaded to a critical displacement, polymer chains can re-adsorb to the surfaces of clay platelets. The quantity of re-ruptured physical bonds is proportional to the product of re-adsorption ratio and that of initially ruptured bonds. These results may be useful for the toughening design of hydrogels.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::dffadee9d20b1873450825def7f5ee06 https://doi.org/10.1063/1.4904977 Zobrazit plný text záznamu