INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Yao Qin,Yuanmeng Wang,Hengkun Zhao,Fuju Xu,Jingbo Zhao,Jue Cheng,Junying Zhang
Vinylogous urethane (VU) vitrimer, as an emerging reprocessable material, exhibits excellent designability, reprocessability, recyclability, and wide potential applications. A critical challenge persisting in VU materials is harmonizing exceptional mechanical strength with robust recyclability and reprocessability. Here, a simple strategy was presented to synthesize VU vitrimers with excellent mechanical properties and good reprocessability through the incorporation of symmetrical diamide motifs into VU backbones. Dynamic mechanical analysis and tensile testing revealed outstanding mechanical properties, including a tensile strength of 112.2 MPa and a storage modulus of 2.5 GPa. The designed VU networks demonstrated full closed-loop recyclability via thermal reprocessing or acidic hydrolysis, retaining 80–90% of their initial mechanical integrity after two reprocessing cycles. This study provides a versatile molecular design paradigm for engineering high-performance reprocessable materials and extends its applicability to VU-based systems and other recyclable polymer platforms.
研究领域:
高分子化学
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材料科学
·
可持续化学
·
再生材料工程
·
动态共价化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Xin Wang,Binbo Wang,Rong Huang,Tao Jiang,Yi Wang,Shuai Du,Falin Li,Jin Zhu,Songqi Ma
Poly (butylene adipate- co -terephthalate) (PBAT)/starch composites have captured great attentions due to their favorable biodegradability and cost-effectiveness. However, it is still a challenge to prepare PBAT/starch composites with superior mechanical performance, solvent and creep resistance, and gas barrier. This study used a chain breaking-crosslinking strategy to prepare covalent adaptable network (CAN) composites from PBAT and unmodified starch via reactive extrusion. In the chain breaking stage, dipentaerythritol was used to break PBAT via transesterification and capped more hydroxyl groups on PBAT, achieving favorable compatibility with unmodified starch, which is confirmed via infrared spectroscopy analysis and scanning electron microscopy among other experimental methods. In the crosslinking stage, the hydroxyl groups of chain broken PBAT and starch were reacted with styrene-maleic anhydride copolymer (SMA) to form CAN composites. The superior compatibility and network feature gave the composites excellent thermal properties, strength and modulus, creep resistance, solvent resistance and gas barrier performance. Moreover, fast stress relaxation can be achieved based on the transesterification, allowing for extrusion processing and thermal compression molding, demonstrating excellent reprocessing recyclability of the PBAT/starch CAN composites. Overall, this work provides a simple, green and efficient method for preparing high-performance PBAT/starch CAN composites, which should also be suitable for other polymer/filler composites.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 43
·26858-26866
·
IF 3.108
Peiyao Yan,Wei Zhao,Xiaowei Fu,Zhimeng Liu,Weibo Kong,Changlin Zhou,Jingxin Lei
Environmental protection and resources exhaustion have become the two major obstacles that the human race faces. Moreover, conventional thermoset polymers, which have been extensively applied in various fields, are difficult to be reprocessed and recycled thereby resulting in a wastage of resources and environmental pollution owing to their chemical crosslinks. Therefore, vitrimers may be a good option to solve this problem. In this study, renewable castor oil was used as the raw material to synthesize multifunctional polyurethane-vitrimers (PUVs), whose intrinsic carbamate bonds undergo transcarbamoylation reactions in the presence of a catalyst. Reprocessing experiments have shown that reprocessed PUVs have nearly the same excellent tensile property compared with the pristine PUVs and have significant potential for future engineering applications. Subsequent studies have indicated that crosslinked networks have properties of thermally-induced dual-shape memory effect (dual-SME) and self-welding due to transesterification reactions of carbamate bonds. As the current methods of dealing with abandoned thermoset polyurethanes have drawbacks, it can be anticipated that our findings will create significant benefits for our life.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 42
·34861-34873
·
IF 4.6
Minjun Yin,Hongting Pu
Despite the critical role of polybenzimidazole (PBI) in high-temperature membranes in fuel cells, its practical deployment remains hindered by inherent limitations including low molecular weight (<20 kDa), poor solution processability, and irreversible network formation upon conventional synthesis. To address these challenges, a dynamic covalent strategy was introduced, leveraging Diels–Alder (DA) chemistry for topological reconfiguration. By subjecting furan-functionalized PBI prepolymer (PBI-furan, Mn = 8.2 kDa) to bismaleimide chain extension, we achieve a fourfold increase in molecular weight (Mn = 32 kDa), yielding a reversibly crosslinked PBI-DA membrane. Compared to traditional PBI with the same molecular weight, this architecture synergistically integrates exceptional thermal stability (>450 °C onset decomposition), robust mechanical strength (tensile strength >80 MPa), suppressed phosphoric acid swelling (<10%) and elevated ionic conductivity. Crucially, the dynamic network enables cyclic reprocessability and autonomous self-healing, retaining >90% of the initial mechanical properties after three tensile cycles. Compared to static PBI networks, this system reduces irreversible chain entanglement, while maintaining performance parity. By deeply integrating dynamic covalent chemistry with PBI materials, this work not only advances the performance of high-temperature proton-exchange membranes but also establishes a novel framework for the sustainable design of green energy devices, presenting significant scientific merit and engineering application potential.
研究领域:
高分子材料
·
能源材料
·
膜科学
·
燃料电池
·
功能高分子
·
动态共价化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Matter
·
2021
·
IF 15.589
Yang Yang,Huimin Wang,Shuai Zhang,Yen Wei,Xiangming He,Jianlong Wang,Yingying Zhang,Yan Ji
Soft actuators are highly desirable in soft robots, electronic devices, wearable devices, etc. Both multi-stimuli responsiveness and multichannel self-healing ability are essential for soft actuators to be used in different circumstances. However, to date, research on soft actuators with multi-stimuli response or multichannel self-healing ability is scarce, and there is none on actuators with both multi-stimuli abilities. Here, we show that simply hot-pressing carbonized silk fabrics into the surface of vitrimers results in a thermosetting soft actuator that can be efficiently and repeatedly self-healed by five stimuli (light, electricity, electromagnetic wave, solvent, and heat) and can respond to four stimuli (light, electricity, heat, and solvent) simultaneously. Moreover, due to the nature of vitrimer, it is robust, sustainable, recyclable, and reprocessable. This soft actuator may greatly broaden its applications, as it is hopefully healed and actuated by a handy and facile tool when it is used in different environmental circumstances.
研究领域:
材料科学
·
软体机器人
·
智能材料
·
自修复材料
·
高分子科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Yingchao Cai,Chunmei Li,Yumin Yang,Haonan Li,Yuhang Wang,Qiuyu Zhang
Owing to excessive energy consumption and environmental deterioration, thermosets with permanent covalent crosslinks have encountered unprecedented challenge in the sustainable development. An effective method to address this intractable problem is to construct covalent adaptive networks that contain dynamic covalent bonds. Herein, self-healable and reprocessable cross-linked poly(urea-urethane) elastomers with high mechanical performance were simply developed by introducing dynamic oxime–carbamate bonds (POUUs). The studies on nuclear magnetic resonance indicated that the sufficient exchange rather than the reversible dissociation of oxime–carbamate bonds was the key to network arrangement at elevated temperatures. Due to the incorporation of strong polar urea bonds, POUUs showed excellent mechanical performance with a tensile strength of 27.8 MPa and toughness of 52.5 MJ m–3. The good self-healing ability of POUUs was demonstrated by the disappearance of scratches at 80 °C after 15 h. All POUUs were easily remolded (130 °C, 5 MPa) into transparent films with a maximum recovery efficiency of 80%. Furthermore, complete dissolution in N,N-dimethylformamide was achieved at 100 °C after 4 h, exhibiting high recyclability of the cross-linked POUUs.
研究领域:
高分子科学
·
材料工程
·
化学合成
·
可持续发展
·
力学性能研究
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Chenhui Cui,Xingxing Chen,Li Ma,Qianyun Zhong,Zhen Li,Arumugam Mariappan,Qiang Zhang,Yilong Cheng,Gang He,Xiaoming Chen,Zhen Dong,Le An,Yanfeng Zhang
The development of adhesives with superior optical and mechanical performance, solvent resistance, and reworkability is gaining increasing attention in recent years. However, traditional materials do not possess reprocessability and healing characteristics for sustainable development. Here, a superior dynamic polythiourethane (PTU) adhesive with high reprocessability was developed by introducing covalent adaptable networks (CANs). Specifically, dynamic thiocarbamate bonds (TCB) were used to prepare PTU CANs, which showed dramatically enhanced malleability and recyclability. The Young’s modulus of the material was 2.0 GPa and the tensile strength was 62.7 MPa. The reprocessing temperature of CANs was reduced to 80 °C while more than 90% of their mechanical properties were retained, even after being reprocessed several times. Moreover, the highly transparent and water-resistant PTU CANs featured an excellent bonding property and reworkability for various materials including glass, with a lap shear strength of 2.9 MPa, metal (5.1 MPa), and wood (6.3 MPa), compared with commercially available adhesives. Additionally, carbon fiber-reinforced composites constructed with PTU CANs were capable of being fully recycled and reused. Importantly, laminated glass with a toughened PTU–PU elastomer interface exhibited an outstanding impact fatigue-resistance behavior, sustaining thousands of impacts. These features demonstrate that PTU CANs show great potential as sustainable materials.
研究领域:
材料科学
·
化学工程
·
可持续材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）