CHEMICAL ENGINEERING JOURNAL
·
2022
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IF 16.744
Xiankun Wu,Jiale Zhang,Haonan Li,Huihui Gao,Mang Wu,Zhongkai Wang,Zhong Wang
It is a key challenge to combine high mechanical strength and excellent autonomous self-healing properties in one elastomer to match the requirements of commercial applications. Chemical cross-linking or ordered crystalline domains can afford high mechanical strength but are often based on the cost of losing autonomous self-healing performance. To address this dilemma, a strategy involving dual hard-phase structures was developed to reinforce self-healing polyurethane elastomers, by introducing plant oil-derived aliphatic chains into the hard segments. The dangling fatty acids not only allow segmental motion of the hard domains but also suppress the crystallization within polyurethane soft segments. The tailored dual-hard phase structure and dynamic chain motion are responsible for outstanding mechanical properties (tensile strength to 21.8 MPa and toughness of 131.6 MJ m −3 ) and autonomous self-healing ability (∼100 % healing efficiency). Furthermore, a versatile mechanical robust flexible conductor is conveniently constructed with an auto-repair capability at ambient conditions. This work represents a molecular design paradigm of simultaneously integrating balanced mechanical strength, durability, and self-healing ability for high-performance elastomers that can find applications such as skin-inspired wearable devices.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
RSC Advances
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2017
·Vol. 7
·期 33
·20093-20100
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IF 3.108
Ye Xiao,Huihua Huang,Xiaohong Peng
Polyurethanes can be modified to obtain an intrinsic self-healing property, which is the ability to self-recover from the damage of bulk materials, by changing the ways of increasing the density of hydrogen bonds or by inducing additional reversible crosslinks. An environment-friendly self-healing waterborne polyurethane (SHWPU) containing sulphonate groups was synthesized from isophorone diisocyanate, poly(tetramethylene glycol) and poly(1,4-butylene adipate glycol) and dispersed in water using the aliphatic diamine sulphonate as a hydrophilic chain-extender. The SHWPU coatings show a higher healing efficiency than the coatings without sulphonate group chains extended by ethylenediamine (EDA). With an increase in the soft contents, the healing efficiency increases, by virtue of which the polymer can completely recover itself at a temperature of 100 °C for 18 h. Moreover, significant phase separation of the continuous soft phase distributed with a spot-like hard phase is observed, which is due to the formation of ionic clusters.
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
ACS Applied Polymer Materials
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2025
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IF 4.7
Hao Wu,Xing Guo,Ming-Chao Luo,Shuangquan Liao
Dynamic covalet networks, exemplified by Vitrimers, hold significant promise for sustainable polymers due to their reprocessability and mechanical robustness. However, their susceptibility to creep deformation under sustained stress, driven by dynamic bond mobility, limits practical utility. We report a multiphase Vitrimer elastomer based on transesterification. Two distinct carboxylic acid cross-linkers containing dynamic β-hydroxy ester bonds were highly cross-linked into epoxidized natural rubber (ENR). Dithiodibenzoic acid (DS) bearing benzene rings first undergoes preferential aggregation via π–π interactions and thermally cross-links with epoxy groups to form a rigid hard phase, thereby restricting chain slippage and rearrangement at service temperatures to enhance creep resistance. Concurrently, 3,3′-dithiodipropionic acid (DD) establishes a soft phase with epoxy groups in the matrix, while preserving the material’s reprocessability. Stress relaxation and creep tests reveal that the hard domains/regions within the heterogeneous network structure impede segmental relaxation at relatively low temperatures, thereby enhancing the material’s creep resistance. At elevated reprocessing temperatures, however, these hard domains maintain dynamic bond exchange and segmental mobility, while the soft phase facilitates material reprocessability. This work establishes a scalable design framework for Vitrimers that synergistically enhances creep resistance and recyclability, addressing critical demands for durable yet sustainable engineering materials.
研究领域:
高分子科学
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材料工程
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可持续化学
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材料力学性能
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自修复材料
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Mengyao Chen,Wenjing Qin,Yanli Wang,Yu Song,Fei Tian,Hanlin Zhai,Changshun Gu,Le Ge,Song Xue,Xinxin Li,Xiangchuan Zhao,Yixin Xu,Zeyu Ming,Shengrong Li,Shougen Yin
3D printing hydrogel shows a broad application prospect in soft actuator/robot and flexible electronics due to its adaptable structure and designable chemical composition. Herein, a Zr 4 + -deep eutectic solvent (DES)-PAAc hydrogel is developed via digital light processing (DLP) 3D printing technology. By synergistically integrating hydrogen bonding, Zr⁴⁺-carboxylate ionic coordination bonds, and electrostatic interactions between DES and PAAc chains, the hydrogel achieves a unique soft-hard phase-separated dual-network architecture. This design provides an internal energy dissipation-storage mechanism, endowing the hydrogel with exceptional mechanical robustness (maximum stress of 1.86 MPa), high conductivity (conductivity of 0.51 S/m), and cyclic compression stability (energy dissipation of 2.69 kJ m⁻³), thereby overcoming the trade-off between toughness and functionality in conventional hydrogels. Leveraging DLP 3D printing, the hydrogel is precisely tailored into complex architectures (e.g., bioelectrodes, impact-resistant structures). Remarkably, the hydrogel serves as a self-powered pressure-sensing electrolyte in Zn-Cu batteries and a weather-resistant bioelectrode for real-time monitoring of bio-signals. Furthermore, its tailored structures exhibit programmable impact resistance for delicate device protection. The combination of additive manufacturing and cross-domain functionality establishes a paradigm for hydrogels in wearable healthcare, soft robotics, and energy-autonomous sensing systems.
研究领域:
材料科学
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3D打印/增材制造
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柔性电子器件
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传感器
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能源存储
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生物医学工程
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软体机器人
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高分子科学
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电化学
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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）