CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Yanhong Zhou,Li Xiang,Zhiyuan Zhao,Tao Xu,Qi Wang,Xiaoyu Zhang,Zichu Zhang,Wei Zeng,Ning Wei,Limin Ruan,Yi Xiong,Siliang Wang,Tongqing Liao
In a biomimetic iontronic electrochemical system, the interior ions can move accompanied by surrounding charges, and then facilitating the integral carrier transfer, yet their transfers are still restricted by concentration gradient and temperature. Here, an ordered porous bismuthene electrode is designed, composed by bismuthene, bismuthene-derived Bi 2 O 3 &BiOCl, and borophene materials, with supercapacitive 4.96 F g −1 attribute retaining 89.6 % after 29,600 cycles, and the dispersive bismuthene nanosheets are also embedded into regenerated silk fibroin as elastic electrolyte. The resultant symmetrical iontronic pressure sensor shows high sensitivity of 2.31 kPa −1 in a wide 0.2–10 kPa range, and 0.41 kPa −1 sensitivity ranging 10–48 kPa, fast response/recovery time of 60/50 ms, and low detection limit of 0.45 Pa. The simulation and mechanism analysis demonstrate that a field emission effect plays an important role in electrolyte, in which the ions around the ordered bismuthene as emitters are launched and moved along the inner bismuthene nanosheets, step by step, to enormously shorten the ions migration path and effectively accelerate ion-charge pair transfer. Compared to the device without bismuthene in electrolyte, the sensitivity of sensor is improved by 23.81 times with high reproducibility over 1000 cycles. Additionally, the poly (3, 4-ethylenedioxythiophene): poly (styrene sulfonate) in electrolyte effectively constrains the movements of polymer molecules, contributing to high temperature adaptability from −15 to 70 ℃. In practical application, a tiny pressure monitoring in hot/cold perception is demonstrated, revealing a promising application in wearable systems and intelligent robotics.
研究领域:
材料科学
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生物医学工程
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传感器技术
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DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2024
·
IF 4.5
Bin Zhou,Yinwen Li,Shoufang Xu,Xingjian Li
Polycaprolactone (PCL) based thermadapt shape memory polymers (SMPs) have exhibited superiority over traditional analogues by allowing shape-editing to reconfigure permanent shapes into more complex geometrical shapes, driven by the pursuit of advanced functionalities for high-value applications. Nevertheless, although transesterification-based PCL networks exhibit impressive shape reconfigurability as prototypical thermadapt SMPs, there are still constraints in terms of the need for significant flexibility in architectural adjustment and property modulation without compromising reconfigurability, which would be relevant for practical applications. Here, we present a simple yet efficient strategy to create PCL-based thermadapt SMPs that possess a highly tunable structure and properties, as well as exceptional reconfigurability. The family of SMPs, called thermadapt shape memory AB copolymer networks (AB-CPNs), was synthesized by UV-initiated free radical polymerization between PCL diacrylate as crosslinker and 4-hydroxybutyl acrylate (HBA) as comonomer. The thermadapt AB-CPNs allow for significant structural alterations with 0 wt% to 70 wt% HBA while maintaining excellent shape memory and shape reconfigurability effects. The insertion of the polymer segment containing free hydroxyls not only promises tunable material properties but also makes network rearrangement easier since dynamic hydroxy-ester bonds are more active than dynamic ester-ester bonds. It is envisioned that the thermadapt shape memory AB-CPNs with widely tunable macroscopic properties will drive progress in the real-world applications of SMP devices with complicated geometric structures.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
Advanced Materials Technologies
·
2023
·Vol. 8
·期 14
·2300029
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IF 6.8
Sijia Ren,Jiachun Feng
The reconfigurable and reprocessable thermadapt two-way shape memory polymers (2W-SMPs) are highly desirable for many advanced biomimetic applications, but the preparation of these polymers with economical raw materials and convenient approaches still remains a challenge. In this work, thermadapt 2W-SMPs based on a dual crosslinking network are synthesized by linking polyethylene glycol with hydroxylated modified SBS via dynamic covalent bonds. Benefiting from the synergistic effect of combining a dynamic covalent network and a physical cross-linking network, the thermadapt 2W-SMPs exhibit a good balance of mechanical properties and favorable two-way shape memory effect (2W-SME) with the reversible actuation strain of 11.9%. The 2W-SMPs can be reprocessed and transformed into complex 3D shapes after multiple folding processes due to the dynamic covalent exchange as well as the reversible physical crosslinking, and the obtained new samples still exhibit good 2W-SMEs. Furthermore, the transition temperature of 2W-SMPs is designed to be close to human body temperature, and it is manufactured into a biomimetic mimosa actuator that can undergo shape changes through finger contact and cooling. This work provides a new idea for the development of thermadapt 2W-SMPs, and the obtained materials show great potential applications in intelligent actuators.
研究领域:
材料科学
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生物仿生学
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产品关联
DOI
高影响因子
ACS Applied Polymer Materials
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2023
·
IF 5
Jianing Lv,Anying Wang,Yinwen Li,Shoufang Xu,Xingjian Li
Beyond self-repairability and reprocessability, permanent shape reconfigurability in thermadapt shape memory polymers (TSMPs) is a prominent functionality in dynamic covalent polymer networks. The design and synthesis of TSMPs with a wide range of tunable macroscopic properties that do not require sophisticated chemistry or modification are highly desirable for real-world device applications but are a significant challenge. Herein, we present a straightforward yet efficient strategy to prepare TSMPs with adjustable properties, good reconfigurability, and self-repairability via ester–ester exchange. The class of TSMPs is engineered as the architecture of AB copolymer networks (AB-CPNs), which are composed of the semicrystalline polycaprolactone (PCL) as the A-segment and the poly(butyl acrylate) (PBA) as the B-segment. Regulating the weight content of the PCL segment in the thermadapt shape memory PCL-co-PBA networks can govern the network rearrangement kinetics, thermal properties, thermomechanical properties, switching temperature, and shape memory properties. The thermadapt shape memory AB-CPNs with ester–ester exchange do not require the introduction of extra hydroxyl groups, and their network structure is readily adjusted, allowing for considerable flexibility in the structure design and property adjustment. It is anticipated that a large family of thermadapt shape memory AB-CPNs with widely tunable macroscopic properties and the commercial availability of precursors will contribute significantly to real-world applications of SMP devices.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2023
·Vol. 47
·期 38
·18039-18048
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IF 3.3
Yuan Nie,Mei Li,Shouhai Li,Mingtao Lin,Na Yao,Tianxiang Deng,Xiao Feng,Xiaohua Yang,Haiyang Ding,Lina Xu
The development of recyclable biopolymers from renewable resources is of great importance to sustainable development and environmental protection. Biopolymers not only provide a platform for achieving a friendly environment, but also reduce dependence on fossil fuel elements. In this study, a castor oil-based macromolecule prepolymer containing reactive isocyanate groups was firstly synthesized, and next a series of recyclable bio-polymers containing dynamic Diels–Alder bonds, imine bonds and hydrogen bonds were designed and fabricated by the introduction of furfural derivatives and vanillin. Dynamic covalent bonds and hydrogen bonds can bestow biopolymers with excellent comprehensive properties, including high self-healing efficiency, shape memory and reprocessability. Meanwhile, the formation of a reversible cross-linked network of hydrogen and dynamic bonds significantly improved the mechanical properties and endowed the biopolymers with self-healing capability. Fourier transform infrared spectroscopy and 1H nuclear magnetic resonance indicate the successful preparation of the biopolymers. Thermal gravimetric analysis demonstrates that the materials as-prepared possess high thermal stability. Mechanical tests show that the materials have excellent mechanical properties with a maximum stress of 36.44 MPa. Surface scratches can be repaired at 120 °C for 5 minutes. The biopolymers also exhibit shape memory properties. This work will contribute to the development and study of functional self-healing biopolymers.
研究领域:
材料科学
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高分子化学
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可持续材料
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环境科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）