POLYMER
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2023
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IF 4.6
Shuofeng Liang,Shuxiu Li,Chenrui Yuan,Chengwei Liu,Jiahui Chen,Si Wu
The development of healable polymers is crucial for the maintenance of underground pipeline systems during trenchless rehabilitation. While photocurable resins are commercial materials for this purpose, we introduce an innovative option: azobenzene-containing polymers (azopolymers) with photoinduced reversible solid-to-liquid transitions. The newly developed azopolymer comprises a methacrylate backbone and side chains incorporating hexyl spacers, azobenzene moieties, and dodecyl tails. We compared the thermal stability, efficiency of photoinduced solid-to-liquid transition, and adhesive strength among azopolymers with varying molecular weights . Subsequently, we identified the most suitable azopolymer for PVC pipe lining . The robust trans azopolymer inner layer maintains a solid state at ambient temperatures. Upon pipe damage, UV irradiation triggers trans -to- cis isomerization , leading to the conversion of the solid trans azopolymer into a liquid cis state. This flowing cis azopolymer effectively repairs cracks and can be reverted to its trans isomer via visible light irradiation or thermal relaxation. Unlike commercial photocurable resins, the developed azopolymers offer the advantage of multiple repair cycles. This study highlights the potential of azopolymers with photoinduced reversible solid-to-liquid transitions as innovative healable materials in trenchless rehabilitation technology.
研究领域:
材料科学
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土木工程
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高分子化学
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DOI
高影响因子
EUROPEAN POLYMER JOURNAL
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2025
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IF 6.3
Yulu Wang,Fengxiang Cao,Gang Liu,Zhen Fang,Zhuhui Qiao
The development of biobased thermosetting materials has garnered considerable interest as a promising alternative to conventional thermosets, which are often constrained by permanent cross-linking and dependence on petroleum-derived feedstocks. Nevertheless, both traditional and bio-based thermosets frequently exhibit limitations in reprocessability and recyclability. In this study, a novel epoxy covalent adaptable network (CAN) incorporating dynamic dual-crosslinking bonds (D-DCB) was synthesized from lignin-derived vanillin (VA) and glycerol propoxylate triglycidyl ether (GPTE). Specifically, a trialdehyde monomer (TAM) was first prepared from VA and GPTE, which subsequently reacted with disulfide-containing compounds (4,4′-diaminodiphenyl disulfide and cystamine) to form bio-based CANs (namely, TAM-APDS and TAM-Cys, respectively). This network synergistically combines imine and disulfide bonds as dynamic covalent units. The imine bonds not only provide fundamental mechanical strength and structural stability but also contribute UV-shielding properties due to their conjugated structure. The disulfide bonds impart reprocessability, self-healing capability, and degradability-enabling rapid disulfide exchange reactions within 1 h using a thiol/ethanol solution at 60 °C. Lap-shear adhesion tests on various substrates demonstrated that the resulting CANs exhibit a high strength of approximately 7 MPa on iron substrates, highlighting their potential as high-performance sustainable adhesives.
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2025
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IF 7.3
Hongliang Ding,Lu Liu,Xiaohua Liu,Hongfei He,Lini Wu,Na Sun,Keqing Zhou,Wei Wang,Chao Ding,Bin Yu
Designing multifunctional polyurethane or polyurea elastomers that are simultaneously strong, recyclable, flame-retardant, and sustainable remains a major challenge in advanced elastomer research. Herein, a phosphorus-containing biobased diol (HMF–DOPO) was synthesized by the reaction between 5-hydroxymethylfurfural (HMF) and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO). Then, the tough, repairable, recyclable, and flame-retardant poly(urethane–urea) (PUA) elastomers cross-linked via reversible Diels–Alder (DA) bonds were developed. The synthesized elastomers exhibited excellent mechanical properties, while PUA–HMF-20% showed the best performance with a high tensile strength of 51.9 MPa and notable toughness of 167.6 MJ m–3. The thermally reversible DA reaction endowed PUA materials with excellent repair and recycling properties. The cut pieces can be reformed into a complete film during hot pressing and solvent reprocessing. Due to the existence of the phosphorus-containing structure, PUA–HMF elastomers also exhibited excellent self-extinguishing capability, while PUA–HMF-40% showed the highest limiting oxygen index (LOI) value of 27% and reached a V-0 rating in the UL-94 vertical burning test. In the cone test, both the peak heat release rate (PHRR) and total heat release (THR) values of the PUA–HMF samples were significantly reduced. This work provides a promising strategy to expedite high-performance sustainable advanced elastomers and expand the industrial application.
研究领域:
高分子材料科学
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功能高分子
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可持续材料
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阻燃材料
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再生化学
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智能材料
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绿色化学
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DOI
高影响因子
Matter
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2021
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IF 15.589
JianHua Xu,Tong Liu,Yongzheng Zhang,YaNa Zhang,Kai Wu,Chuxin Lei,Qiang Fu,JiaJun Fu
Summary Mechanically robust and healable polymers are in high demand for the intelligent architecture, aerospace engineering, and auto industry; however, most of them suffer from brittle fracture owing to the inherent conflict between stiffness and toughness within polymer systems. Inspired by the microstructure of dragonfly wings, we show how brittle, stiff, and healable materials can become defect tolerant by strategies ranging from molecular design to structural processing. Transition metal carbides/carbonitrides form an interconnected mechanical framework, similar to the rigid nervure in dragonfly wings, to stabilize the growth and slow down the extension of crack, while the initially glassy healing polymer closely bonds to rigid framework through powerful interfacial supramolecular interactions, playing a key role in the soft membrane dissipating stress energy. Compared with initial polymers, the obtained SP/MXene (SPM) nanocomposite exhibits an increase in fracture toughness and flexural strength (54.3- and 25.0-fold, respectively), exceptional thermal stability, mechanical and functional repairability, and good electromagnetic interference shielding.
研究领域:
材料科学
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机械工程
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聚合物科学
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纳米技术
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航空航天工程
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汽车工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）