期刊
JOURNAL OF MATERIALS CHEMISTRY B
卷 5, 期 37, 页码 7683-7691出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7tb01780d
关键词
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资金
- National Natural Science Foundation of China [21504022]
- NSFC-Henan Province [U1304516]
- Henan Province [NSFRF1605, 2016GGJS-039, 17HASTIT006]
- Henan Polytechnic University [72105/001, 672517/005]
- NSF [DMR-1607475, CBET-1510099]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1607475] Funding Source: National Science Foundation
Double network (DN) hydrogels composed of two different polymer networks with strong asymmetry are excellent structural platforms to integrate different mechanical properties into a single material. However, simultaneously achieving high strength and self-healing properties in DN hydrogels still remains a challenge. In this work, we design and synthesize Gelatin/Polyacrylamide (Gelatin/PAAm) DN gels by combining thermo-reversible and physically crosslinked gelatin as the first network and covalently crosslinked PAAm as the second network. The optimized Gelatin/PAAm DN gels demonstrated high mechanical properties (E of 84 kPa, sigma(f) of 0.268 MPa, epsilon(f) of 40.69 mm mm(-1) and W of 6.01 MJ m(-3)), large hysteresis (up to 1012 kJ m(-3) at lambda = 30), and rapid self-recovery properties (similar to 87% toughness recovery at room temperature). These superior properties were largely attributed to effective energy dissipation via the rupture of the first gelatin network. Most interestingly, Gelatin/PAAm DN gels without any chemical crosslinkers in the second network enabled the achievement of both high mechanical strength and fast self-healing properties. By modulating the heating temperatures and healing times, the healed Gelatin/PAAm gels could achieve 53% healing efficiency at a physiological temperature range, which greatly expands their uses for biomedical applications. The combination of high strength, self-recovery, and self-healing properties makes Gelatin/PAAm gels promising candidates for further development and use as thermoresponsive biomaterials under physiological conditions.
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