Journal
STARCH-STARKE
Volume 71, Issue 5-6, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/star.201800281
Keywords
dual network hydrogels; mechanical properties; physical cross-linking; self-healing properties; thermal properties
Categories
Funding
- National Natural Science Foundation of China [41576098, 81773483]
- Science and Technology Department of Zhejiang Province of China [2016C33176, LGF18B070002]
- Natural Science Foundation of Ningbo [2017A610231, 2017A610228, 2017A610069]
- K.C. Wong Magna Fund in Ningbo University
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As promising soft materials, various excellent properties of hydrogels have received widespread attention during recent years. Mechanical properties and self-healing performance are required characteristics for hydrogels in practical applications. An important challenge is to develop hydrogels exhibiting mechanical performance and self-recoverability through physical cross-linking. In this work, the authors report a hydrogel consisting of a fully physically linked poly (vinyl alcohol)/agarose (PVA/AG) dual-network, which is of high toughness and self-healing properties. The synthesis process of the PVA/AG hydrogel is convenient, with AG as the first network, and hydrogen bonding and crystal-associated PVA as the second network to form a dual physical crosslink. Due to this physical cross-linking, the PVA/AG hydrogel has good mechanical properties (tensile strength of 6.5MPa to 14.6MPa, ductility of 168% to 214%). The highest compressive strength of hydrogel is up to 3.66MPa, which is almost 8 times that of pure PVA hydrogel. In addition, it has excellent self-healing properties without stimulation or healing agents. Compared to pure PVA hydrogel, PVA/AG hydrogels have higher thermal stability due to higher decomposition temperatures and lower degradation rates. In this study, the authors also initially explore the potential application of obtained hydrogel.
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