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RISS 인기검색어
- 검색키워드
- 저자 : Shouxiang Liu (검색결과 2 건)
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Preparation and properties of self‑healing polyurethane based on disulfide and hydrogen bonding
Shouxiang Liu,Yu Chen,Yang Qiao,Zhiqiang Li,Yanyan Wei 한국탄소학회 2023 Carbon Letters Vol.33 No.1
Cracks are an inevitable problem during the use of materials, and flexible sensors with self-healing capability are of great importance for applications in wearable devices and skin-like electronic devices. This paper prepared self-healing flexible strain sensors by compounding self-healing polyurethane with carbon nanotubes. First, by changing the ratio of disulfide bonds, a good balance between mechanical properties and self-healing efficiency was achieved in the prepared self-healing polyurethane. The most balanced sample reached 12.28 MPa in tensile strength, after 24 h of self-repair at 30 °C, the tensile strength was 7.75 MPa, and the self-repair efficiency was 63.11%; after 24 h of self-repair at 80 °C, the tensile strength was 11.64 MPa, and the self-repair efficiency reached 94.79%. Then the sensors prepared by compounding with carbon nanotubes showed a good electrochemical response, and both slow and fast repeated bending of the finger wearing the sensors yielded significantly different electrical signal changes, and the sensors were cut off and still had the same function after self-repair at 30 °C, demonstrating their excellent potential for applications in soft robots, wearable devices, etc.
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Preparation and Properties of Cellulose Nanocrystals Based Self-healing Polyurethane
Yang Qiao,Qi Xu,Shouxiang Liu,Zhiqiang Li,Yanyan Wei 한국고분자학회 2023 폴리머 Vol.47 No.3
First, cellulose nanocrystals were extracted from microcrystalline cellulose using the sulfuric acid hydrothermal method. Second, imine aromatic diol (Imine) was synthesized from p-hydroxybenzaldehyde and 4,4'-diaminodiphenylmethane as raw materials. Then the imine was introduced into the polyurethane, and the reversible covalent bond between the imine and the C = N group was used to endow the polyurethane with self-healing properties. Finally, cellulose nanocrystalline (CNC) was added into the self-healing polyurethane as the dispersed phase to prepare the composite. The experimental results show that with the increase of the amount of CNC, the properties of the composites increase first and then decrease, which is due to the physical cross-linking effect of proper CNC distribution in the self-healing polyurethane, it is beneficial to the mechanical properties, but the self-healing property is reduced by further increasing the content, which restricts the movement of the molecular chain. The mechanical properties of the composite with 0.049 g CNC are the best, with fracture strength reaching 20.59 MPa, approximately 1.56 times higher than that of pure self-healing polyurethane, and its elongation at break is 979%, and the self-healing efficiency reaches 84.7%, keeping an excellent level.
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