A self-healing polyvinyl alcohol-molybdenum disulfide composite hydrogel triggered by near-infrared light and its preparation method and testing method
A composite hydrogel and polyvinyl alcohol technology, applied in the direction of applying stable tension/pressure to test the strength of materials, can solve the problems of slow healing speed, rising material temperature, poor mechanical properties of hydrogel, etc., and achieve healing Fast speed, good mechanical properties, and high healing efficiency
Active Publication Date: 2021-06-08
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology
On the one hand, most hydrogels have relatively poor mechanical properties
On the other hand, synthetic hydrogels cannot satisfy both high healing efficiency and rapid healing ability
Zhao et al. (Poly(vinylcohol)hydrogel can autonomously self-heal.ACS Macro Lett.2012, 1, 1233-1236) prepared polyvinyl alcohol hydrogel based on hydrogen bonding, which can self-heal at room temperature , but the healing speed is slow, and the hydrogel has only 72% healing efficiency after 48 hours of healing
In addition, most hydrogels use contact or heating healing methods. The disadvantage is that the contact method cannot ensure sufficient and effective contact with the damaged area. Healing induced by heating will lead to an increase in the temperature of the entire material, which has a negative impact on the overall performance of the material. influences
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[0037] Objects, advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments. These embodiments are only typical examples of applying the technical solutions of the present invention, and all technical solutions formed by adopting equivalent replacements or equivalent transformations fall within the protection scope of the present invention.
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Abstract
The invention discloses a self-healing polyvinyl alcohol-molybdenum disulfide composite hydrogel triggered by near-infrared light, a preparation method and a test method thereof. The composite hydrogel is composed of thiolated molybdenum disulfide nanosheets with photothermal conversion properties and polyvinyl alcohol with excellent mechanical properties. The composite hydrogel is prepared by using thiol molybdenum disulfide nanosheets and polyvinyl alcohol to form hydrogen bond interactions, and is prepared by a simple repeated freeze-thaw method. The molybdenum disulfide surface modification adopts ligand molecules containing mercapto groups to carry out surface modification through the coordination of mercapto groups and molybdenum disulfide surface defect sites to prepare mercapto-containing molybdenum disulfide nanosheets with hydroxyl groups. The invention utilizes near-infrared light to initiate self-healing, promotes the re-formation of hydrogen bonds in the composite hydrogel, and realizes a self-healing mode of remote control and energy conversion.
Description
technical field [0001] The invention relates to a self-healing polyvinyl alcohol-molybdenum disulfide composite hydrogel triggered by near-infrared light, a preparation method and a testing method thereof, which can be used in the technical field of polymer materials. Background technique [0002] Self-healing materials have the characteristics of self-repairing damage, which can increase the safety of materials used and prolong the life of materials. It is a kind of intelligent new material with damage management performance, which has attracted much attention in recent years. According to the healing mechanism, it can be divided into explant type and intrinsic type self-healing materials. Early self-healing materials mainly focus on microcapsules and microtubules rupture to trigger repolymerization to repair damage, but this is an irreversible system. limited. Intrinsic self-healing materials are designed and synthesized based on the concept of dynamic chemistry, using dy...
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IPC IPC(8): C08L29/04C08K7/00C08K3/30C08K5/37C08J3/075G01N3/08
Inventor汪联辉杨文静王小栋徐文雅宇文力辉
OwnerNANJING UNIV OF POSTS & TELECOMM