EUROPEAN POLYMER JOURNAL
·
2018
·
IF 3.741
Ting Li,Zhining Xie,Jun Xu,Yunxuan Weng,Bao-Hua Guo
In this work, diamine chain extenders containing disulfide bonds are reacted with triisocyanates to yield dynamic chemical cross-links based on exchangeable disulfide bonds. The polyurea system with dynamic bonding shows drastic decline of storage modulus and very short relaxation times above 150 °C so that this polymer exhibits typical dynamic properties, e.g. self-healing, recycling and hysteresis loop recovery. The introduction of disulfide bonds dominates the thermal stimulated dynamic properties, since the control samples without disulfide bonds have longer relaxation times even at high temperatures. Interestingly, presence of disulfide bonds leads to the decline of hydrogen bonding strength which can result in their easier dissociation and subsequently easier topological network rearrangement. In addition, almost complete reversibility of the hydrogen bonding is observed from temperature-dependent Fourier Transform Infrared Spectroscopy, which reveals the important influence of hydrogen bonding on dynamic properties. Thus, Hydrogen bonding dissociation is an indirect reason of dynamic properties, while exchange reaction of disulfide bonds is the primary cause. The results may deepen our understanding of the role of hydrogen bonding in the dynamic materials. In addition, the available commercial raw component, operational feasibility and simplicity constitute a great advantage of the so-prepared dynamic polyurea system, i.e. an effective step to implementation of industrial applications and recycle the nonbiodegradable crosslinked polyureas.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Hongrui Liang,Yifen Xu,Jing Song,Yongxi Cui,Yubo Chen,Yu Cao,Qinglong An,Lixian Yin,Tongan Bu,Zhi Wang
Developing degradable and recyclable thermosetting polyurethanes represents a significant step toward environmental protection and resource conservation. However, achieving these properties often compromises mechanical performance and thermal stability. To address this challenge, we developed a high-performance degradable and recyclable thermosetting polyurethane (IP-AD-BA1) by integrating dynamic cross-linkers with abundant hydrogen bonding. First, a polyurethane prepolymer was synthesized using adipic dihydrazide (AD), a chain extender enriched with hydrogen bond donors and acceptors, to generate abundant hydrogen bonding within the polyurethane structure. This prepolymer was then cross-linked to form IP-AD-BA1 using boric acid as the dynamic cross-linker. Comparisons with other polyurethanes of the same type reveal that IP-AD-BA1 exhibits excellent comprehensive performance. This includes outstanding mechanical properties (tensile strength of 51.1 MPa and toughness of 152.1 MJ m −3 ), as well as thermal stability (5% weight loss temperature of 322.5 °C). Moreover, IP-AD-BA1 offers rapid recyclability under mild conditions (110 °C, 15 MPa) while maintaining its mechanical and thermal properties after recycling. It can also be degraded in ethanol, enabling recovery as a linear polyurethane oligomer. Finally, we utilized IP-AD-BA1 to fabricate recyclable foam sensors capable of effectively detecting strain and stress, thereby broadening the potential applications of thermosetting polyurethanes.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2024
·Vol. 42
·期 10
·1595-1601
·
IF 4.1
Wei Meng,Feng Wei-Hao,Yu Chen,Jiang Zhen-Yi,Yin Guang-Qiang,Lu Wei,Chen Tao
Achieving versatile room temperature phosphorescence (RTP) materials, especially with tunable mechanical properties and shape memory is attractive and essential but rarely reported. Here, a strategy was reported to realize multi-functional RTP films with multicolor fluorescence, ultralong afterglow, adjustable mechanical properties, and shape memory through the synergistic dynamic interaction of lanthanide (Ln III )-terpyridine coordination, borate ester bonds, and hydrogen bondings in a poly(vinyl alcohol) (PVA) matrix. By varying the amount of borax, the mechanical properties of the films could be finely controlled due to the change of crosslinking degree of dynamic borate ester bonds in PVA. The assembly and disassembly of borate ester bonds upon the trigger of borax and acid were applied as reversible linkage to achieve programmable shape memory behavior. In addition, the films displayed both fascinating multicolor fluorescence and ultralong afterglow characteristics due to the presence of Ln III doping and confinement of terpyridine in PVA. This study provides a new avenue to impart modulable mechanical strength and shape memory to RTP materials.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Jian Xu,Zheng Dai,Rongrong Chen,Zhongyi Wang,Qi Liu,Jingyuan Liu,Jing Yu,Jiahui Zhu,Jun Wang
Surface icing and corrosion considerably reduce the operational safety of offshore wind turbines and can be mitigated through the use of lubricant-infused surfaces, which, however, often suffer from severe performance degradation under real-world conditions and lack long-term durability. Herein, this work prepares polyurea coatings based on a dynamic crosslinked phase-locked network and show that the alternating arrangement of strong and weak hydrogen bonds between the urea units facilitates the capture and storage of the liquid phase (silicone oil), while the affinity and associative interactions between this phase and polydimethylsiloxane segments ensure strong adhesion and integration. The best-performing coating exhibits good dynamic/static anti-icing properties (freezing delay time = 331 s, temperature of first ice nucleatio n = −24.6 °C, ice shear strength = 19.9 ± 3.3 kPa) according to the results of ice crystal growth simulations and wind tunnel tests while showing an exceptional anti-corrosion performance (low-frequency modulus (|Z| 0.01 Hz ) = 4.22 × 10 10 Ω·cm 2 ) and durability. Thus, this study presents a strategy for enhancing the ability of offshore wind turbines to withstand extreme environments and extending their service lifetimes.
研究领域:
材料科学
·
表面工程
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Yaxin Qiu,Jinxuan Ai,Aiying Liu,Chengkai Yang,Zhifeng Wang,Chong Chen,Xiaozhi Wang
For shape-shifting polymeric materials, the structure of material plays a critical role in determining shape-shifting pathways. However, homogenous structure is often insufficient to meet the programming demands of materials in complex external stimuli fields. In this work, a photoactive cross-linked network was constructed using coumarin-end-capped brush macromolecules, with the introduction of carbon nanofibers enabling efficient photothermal and electrothermal conversion. The dual-patterned programming of this system diversified responsive behaviors of the materials by introducing UV radiation and a shielding layer. Furthermore, the evolution of photo-crosslinking under UV irradiation was monitored in situ via rheological testing, and the temperature distribution within the materials was simultaneously detected in situ. This work presents a practical strategy for dual-patterned programming, enabling the design of shape-shifting pathways of materials under complex stimuli fields.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2021
·Vol. 33
·期 36
·2102096
·
IF 30.849
Qiang Ma,Shenglong Liao,Yingchao Ma,Yanji Chu,Yapei Wang
Elastomers presenting good elasticity, ductility, and chemical resistance at low temperatures can serve as superior performers for explorations in extremely cold environments. However, no commercially available elastomer to date can comprehensively fulfill those demands. Here, a perfluoropolyether (PFPE)-based network crosslinked by dynamic urethane chemistry is demonstrated, which may satisfy the demands of application in ultracold environments. As the crucial constitute in such a crosslinked network, PFPE provides the elastomer with excellent elasticity at a temperature down to −110 °C and outstanding ductility within the cryogenic temperature range. Importantly, the high proportion of fluorocarbon segment also provides wonderful compatibility to most organic solvents, accounting for the low-swelling characteristics of the elastomer in sealing applications. Furthermore, the dynamic crosslinking feature allows the cured elastomer to be reprocessed like thermoplastic polymers, which affords great promise to recycle and reuse the elastomer after its disposal. Inherently, this elastomer would inspire a worldwide interest in the design of elastic devices that are adaptable to extremely low temperature.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
POLYMER INTERNATIONAL
·
2020
·Vol. 69
·期 9
·858-866
·
IF 2.574
Cuicui Ding,Qili Yang,Mengdie Tian,Chenchen Guo,Feng Deng,Yuan Dang,Min Zhang
Collagen-based hydrogels have gained significant popularity in biomedical applications; however, traditional collagen hydrogels are easily disabled for lack of self-healing properties due to their non-reversible bonds. Here, a self-healing collagen-based hydrogel has been developed based on dynamic network chemistry, consisting of dynamic imine linkages between collagen and dialdehyde guar gum, as well as diol-borate ester bonds between guar gum and borax. In addition, macromolecular interactions amongst macromolecules are involved. The above-mentioned interactions were validated by Fourier transform infrared spectroscopy, sodium dodecyl sulfate polyacrylamide gel electrophoresis and DSC. The as-prepared collagen-based hydrogels showed good injectability and rapid self-healing capacity (within 3 min) as reflected from injection tests, optical microscope observations, rheological measurements, as well as self-healing studies. In addition, the collagen-based hydrogels showed accelerated wound-healing properties. This study offers a facile strategy to endow self-healing ability on collagen-based hydrogels without any external stimulus, which show great application potential as wound dressings. © 2020 Society of Chemical Industry
研究领域:
生物医学工程
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材料科学
·
组织工程
✓ 已验证
DOI
高影响因子
Polymers
·
2019
·Vol. 11
·期 8
·1320
·
IF 3.164
Ailing Sun,Wenjuan Guo,Wenjuan Li,Xin Liu,Hao Zhu,Yuhan Li,Liuhe Wei
Conventional approaches to synthesize thermoplastic polyurethane (TPU) with excellent robustness are limited by a competing relationship between soft and hard segments for tuning mechanical properties in terms of chain flexibility and micro-phase separation. Herein, we present a facile and effective way of simultaneously improving the tensile strength, elongation, and toughness by constructing dynamic cross-linkages from metal-ligand interaction between Zn2+and pyridine moiety in backbone of poly(urethane urea) (PUU) derived from 2,6-diaminopyridine and poly(propylene glycol). It was found that a Zn2+/pyridine ratio of 1:4 is the most effective for improving robustness. Specifically, tensile strength, elongation, and toughness could be remarkably increased to 16.0 MPa, 1286%, and 89.3 MJ/m3with 226%, 29%, and 185% increments compared to uncomplexed PUU, respectively. Results from UV-vis, Fourier transform infrared spectroscopy (FTIR), cyclic tensile tests, and stress relaxation reveal that metal-ligand interaction significantly interferes with the hydrogen bonding of urea groups, thus leading to weakening of stiffness. Furthermore, half of vacant ligands enable dynamic complexation during stretching, which consequently ensures constant noncovalent cross-linkages for constraining mutual chain sliding, contributing to simultaneous improvement of tensile strength, elongation, and toughness. This work provides a promising approach for designing TPU with excellent robustness.Keywords:toughening;strengthening;dynamic cross-linkages;metal-ligand;TPU
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
ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 34
·2401822
·
IF 18.5
Wenjie Wang,Xingyuan Lu,Yixuan Li,Xiang Li,Haoxiang Sun,Junqi Sun
It remains a huge challenge to efficiently recycle the printed circuit boards (PCBs) because of the diversity and complexity of the PCBs in terms of material composition. The recycling of PCBs highly depends on the design of the polymers that make up the polymer substrates and conductive pastes. Herein, closed-loop recyclable plastics for use as the polymer substrates and for the preparation of the conductive pastes are fabricated by dynamically cross-linking phenylboronic acid-functionalized poly(methylmethacrylate) (PMMA-B) and poly(urea-urethane) (PUU-B) with boroxines. The closed-loop recyclable plastic, which is denoted as PMMA-PUU exhibits a breaking strength of 71.0 MPa and Young's modulus of 1.8 GPa. Because of the dynamic nature of boroxines, the PMMA-PUU 0.6 plastic can be depolymerized in the N, N-dimethylacetamide/ethanol mixture solvent. The depolymerized PMMA and PUU can be efficiently recovered in high yields and purity through their solubility differences in selective solvents. Conductive pastes suitable for printing of electrical circuits are fabricated through complexation of Ag particles with PMMA-PUU. PCBs composed of PMMA-PUU substrates and PMMA-PUU-based conductive pastes are flexible, healable, and recyclable. The closed-loop recycling of the PCBs enables the collection of highly purified Ag particles, PMMA-B, and PUU-B monomers even when the PCBs are mixed with polymer wastes.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Science Advances
·
2025
·Vol. 11
·期 12
·
IF 12.5
Zekai Wu,Chengzhen Chu,Yuhui Jin,Lei Yang,Bo Qian,Yuepeng Wang,Yihan Wang,Jiani Wu,Yujie Jia,Wenwen Zhang,Zhengwei You
There is usually a trade-off between high-tensile properties and processability in polymers because the mechanisms of these properties are mutually exclusive. Here, we design a chemically coupled four-arm dynamic polymer cross-link site to overcome this challenge. By concurrently increasing cross-link sites and dynamic bond contents, this approach fabricates polymer networks with high cross-link density yet low processing temperature, challenging the conventional structure-property relationship where cross-linking inherently limits plasticity. Notably, the material demonstrates remarkable processability, evidenced by the ratio of G′max to G′min with a temperature differential (ΔT) of 120°C (which signifies the soft-to-hard transition capability). This ratio reaches 153.3, higher than all reported cross-linked polyurethanes. This work represents a molecular strategy that combines electronic effect and topology network design to modulate materials’ properties, and it will be useful for developing next-generation materials.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Yujie Wang,Xili Yan,Kenan Li,Siqi Li,Tao Ai,Fengrong Shi
Conventional epoxy asphalt is difficult to reuse due to its thermosetting inability to heal and reprocess. In this study, using dimer acid (DA) and zinc acetate (Zn(OAC) 2 ) as curing agent and catalyst, respectively, and the hydroxyl-ester bonds were introduced into the dynamic crosslinking network system of the asphalt, a highly compatible epoxy asphalt DEA with heat recovery performance was designed. On this basis, the effects of different contents of capped hyperbranched polyester HP102 on the mechanical properties, low-temperature properties, and compatibility of DEA were investigated. The results showed that the base asphalt was successfully grafted with hydroxyl and ester groups, and this chemical modification effect reduced the polarity between the asphalt phase and the resin phase, resulting in a notable improvement in the compatibility of DEA compared with commercially available epoxy asphalt. The introduced HP102 improves not only the low-temperature ductility of the material but also its structural presence of -COO- groups, which can be further used to realize the dynamic exchange and reorganization of hydroxyl-ester bonds, which contributes to the modulus relaxation of the material and enhances its mechanical properties and self-healing ability. The highly branched structure of HP102 increases the unoccupied space and undergoes stress relaxation, which contributes to the improvement of the low-temperature ductility of the material. In addition, the cyclic tensile test results show that the mechanical property recovery rate can reach 86.7 % when hot-pressing processed at 180 °C for 5 h, which confirms that the epoxy asphalt under the reversible covalent crosslinking network possesses non-negligible recycling potential, and provides an engineering application reference for the hot-pressing recycling of epoxy asphalt.
研究领域:
材料科学
·
化学工程
·
道路工程
✓ 已验证
产品关联
DOI
高影响因子
Science China-Chemistry
·
2024
·Vol. 67
·期 10
·3458-3467
·
IF 10.4
Zuo Han,Zhang Luzhi,Xuan Huixia,Gu Shijia,Xu Xinxin,Neisiany Rasoul Esmaeely,Wu Qilin,You Zhengwei
Polymeric materials have penetrated all aspects of society and play an irreplaceable role. However, there is an inherent contradiction between their mechanical properties and processing behavior. Here, inspired by cement, a crucial construction material renowned for its excellent fabricating behavior and self-strengthening properties, we have developed dynamic cross-linked poly(oxime-urethane) (CPOU). The synthesized CPOU showed good self-healing ability and 3D printability owing to the dynamic dissociation and re-association of oxime-carbamate bonds. Simple objects printed through the fused deposition modeling technique were able to be readily assembled into complex architectures through intrinsic self-healing. Furthermore, the self-strengthening of CPOU was successfully realized through multiple-step tandem reactions. The dissociation of dynamic oxime-carbamate bonds produced–NCO groups, which reacted with the surrounding water to form polar urea bonds in the polymer network, leading to an increase in the tensile strength of CPOU from 11.95 to 19.37 MPa. This work not only develops the polymers with combined self-healing, facile fabricating, and self-strengthening properties but also provides a new molecular strategy to modulate the properties of polymers, which could be potentially applied in diverse areas.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）