LANGMUIR
·
2022
·
IF 4.331
Yuanjing Gan,Xiaosen Pan,Jie Li,Miaomiao Liu,Boyue Liu,Meng Gao,Ning Ma,Hao Wei
Biomineral materials such as nacre of shells exhibit high mechanical strength and toughness on account of their unique “brick-mortar” multilayer structure. 2-Ureido-4[1H]-pyrimidinone (UPy) derivatives with different types of end groups, due to the self-complementary quadruple hydrogen bonds and abundant Ca2+ binding sites, can easily self-assemble into supramolecular aggregates and act as templates and skeleton in the process of inducing mineral crystallization. In this work, UPy derivatives were used as templates to induce the mineralization and growth of CaCO3 through a CO2 diffusion method. The morphology of CaCO3 crystals was modulated and analyzed by adjusting the synthesizing parameters including Ca2+ concentration, pH, and end groups. The results showed that, by the regulatory role of the mineralization template, it was easier to realize the multilayer crystal structure at a lower concentration of Ca2+ (less than 0.01 mol L–1). Under alkaline regulation, the quadruple hydrogen bonds would be destroyed, and the template’s regulation effect on the morphology of CaCO3 crystals would be weakened. Moreover, by comparing different types of end groups, it was proven that the UPy derivatives with carboxylic acid groups (−COOH) played a crucial role in the process of CaCO3 crystallization with unique morphologies.
研究领域:
材料科学
·
生物矿物学
✓ 已验证
DOI
PubMed
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2025
·
IF 9.8
Yan Wang,Xianhui Dong,Yan Wang,Zuming Hu,Yinjun Chen,Junrong Yu,Meifang Zhu
Aramid fiber/epoxy (AF/EP) composites often exhibit suboptimal interfacial bonding between the fibers and matrix, which undermines their mechanical performance and hinders the broader application of these materials. Herein, an amphiphilic polymer brush of polyvinyl alcohol-2-Amino-4-hydroxy-6-methylpyrimidine-hexyl-isocyanate (PVA-UPy) as interfacial modification agent was designed and synthesized to reinforce interfacial bonding of AF/EP composites. The incorporation of PVA-UPy markedly improved the interfacial adhesion between the aramid fibers and the epoxy matrix, leveraging strong supramolecular interactions and principle of “like dissolves like”. The interfacial shear strength of AF/EP composites displayed a substantial boost from 27.9 MPa to 60.9 MPa. Additionally, the interlaminar shear strength, flexural strength and tensile strength of composites were reinforced by 55.9%, 46.8% and 42.9%, respectively. The reinforcement is ascribed to the formation of strong hydrogen bonds between 2-Amino-4-hydroxy-6-methylpyrimidine (UPy) side chain of PVA-UPy and the AF/EP interface, as well as the compatibility principle between hydroxyl and epoxy. This work presents a novel and straightforward approach to the design and synthesis of interfacial modification agents, offering an effective strategy for reinforcing interfacial bonding in composites through supramolecular interactions.
研究领域:
材料科学
·
复合材料工程
✓ 已验证
产品关联
DOI
高影响因子
Applied Materials Today
·
2025
·
IF 6.9
Ji Ma,Xinfeng Pang,Zhijie Chen,Lili Du,Ping Qiu
Corrosion remains a critical challenge, particularly in aqueous environments, where traditional coatings struggle to maintain integrity. Despite advancements, self-healing materials often exhibit insufficient healing efficiency and stability underwater. This work presents a novel PDMS-based self-healing elastomer, PDMS-SS 1 /UPy 1 , incorporating dynamic disulfide bonds and 2-ureido-4[1H]-pyrimidone (UPy) unit for robust amphibious self-healing. Synthesized via a two-step reaction, PDMS-SS 1 /UPy 1 exhibits high thermal stability (T 5 % = 362 °C), excellent mechanical properties, and >92 % self-healing efficiency at 90 °C. FTIR, Raman, and XPS confirm successful SS/UPy incorporation, while SEM and AFM reveal uniform morphology. Contact angle measurements and adhesion tests confirm environmental stability and substrate compatibility. Furthermore, EIS demonstrates exceptional corrosion resistance (>10⁸ Ω·cm² in NaCl solution), and the innovative application of distribution of relaxation times (DRT) analysis provides deeper insights into the coating's electrochemical behavior. PDMS-SS 1 /UPy 1 offers a promising solution for durable anti-corrosion protection in demanding aqueous environments.
研究领域:
材料科学
·
腐蚀与防护
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
Crystals
·
2021
·Vol. 11
·期 12
·1530
·
IF 2.589
Cong Chen,Xue-Wen Zhang,Hai-Mu Ye
A large spherulite structure deteriorates the mechanical properties of crystalline polymers, and therefore various methods have been explored to increase primary nucleation density. Recently, chain-end modification has been proposed as an effective approach for regulating polymer crystal nucleation. However, the relevant nucleation mechanism still requires investigation. Therefore, in this work, 2-ureido-4[1H]-pyrimidinone (UPy) units, which can form stacks via quadruple hydrogen bonds with each other, are introduced as end groups for the preparation of interacting telechelic poly(butylene succinate) (PBS-UPy) oligomers with different molecular weights (Mns). The crystallization, especially the nucleation behavior of PBS-UPy, is studied in detail by comparing with the corresponding pre-polymer, the hydroxyl-terminal PBS (PBS-OH). The thermal properties of PBS-UPy exhibit similarMn-dependent tendency to those of PBS-OH, but with weaker total crystallization rate. The spherulite growth rate is significantly reduced, whereas the primary nucleation density is highly promoted, after introducing UPy groups. Further investigation reveals that the mechanism of UPy stacks’ influence on nucleation ability changes from inhibition to promotion with respect toMn. Even under an inhibition of nucleation ability, the final nucleation density is obviously increased because of a significant decline of the growth rate. In addition, the change in the impact of UPy stacks on nucleation ability is speculated to originate from the memory expression feasibility of ordered conformation in the melt during crystallization.
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Yu Yuan,Shihu Zhu,Jun Zhu,Peixin Niu,Ailing Sun,Xingjiang Liu,Liuhe Wei,Yuhan Li
The miniaturization and reliability of portable electronics are increasingly dependent on structural adhesive while developing detachable, reusable, and recyclable adhesives remain great challenge. Herein, we developed a novel strategy of incorporating self-complementary quadruple hydrogen bonds into multi-branch polyurethane as terminal motifs to construct supramolecular adhesive. Impressively, the as-synthesized TPU-UPy was endowed with a high adhesion strength of 6.8 MPa for steel and featured excellent multiple reusability with more than 70% of the original adhesion strength remained even after reuse for five times. More importantly, it exhibited increasing trend of adhesive strength as the stretching speed increases, suitable for application of anti-impact. The way of generating UPy motifs by this synthetic route did not involve excessive consumption of reactants, which was potential to be industrialized. Thus, the TPU-UPy is a candidate hot melt adhesive that can be put into practical use of portable electronics encountering occasional impact.
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
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Biru Shi,Xiaoling Xu,Jiahui Zhong,Zhenyu Zhang,Haosen Ma,Yu He,Xinxin Tian,Yan Zhou,Xiangdong Liu,Dekun Sheng,Yuming Yang
Hot-melt adhesive (HMA) is commonly used in industrial manufacturing due to its ease of use. However, the direct factors that affect shear strength have been unclear in recent years, making it difficult to prepare hot melt adhesives with high shear strength, which are mostly lower than 6 MPa. In this study, three types of polyurethane HMAs, differing in the position of H-bond motifs, ureidopyrimidinone (UPy), were synthesized and characterized, the most central factor for shear strength, Young's modulus , was firstly found out and proved. Side-chain UPy provides better flexibility and more chain entanglement . The lap shear strength of SPU was about 13.48 MPa, which was the highest shear strength of PU HMA, and remained 73.4 % even after 4 cycles. Compared to the other two samples, the side-chain motifs improved the possibility of forming hydrogen bonds with adherends and increased chain mobility. This led to a more efficient wetting process and strengthened Young's modulus directly, enhancing adhesive property incomparably. This work provides a satisfactory method for achieving high shear strength in HMA.
研究领域:
材料科学
·
化学工程
·
聚合物科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2019
·
IF 3.771
Jin Hu,Ruibin Mo,Xiang Jiang,Xinxin Sheng,Xinya Zhang
One of the greatest challenges of robust self-healing materials is the confliction between high chain mobility for self-healing and a stable structure for mechanical strength . Herein, dangling 2-ureido-4[1 H ]-pyrimidione (UPy)-functionalized side groups were introduced into the hard segments of thermoplastic polyurethane (TPU) elastomers , where embedded the dynamic disulfide bonds in the main chain. The strong quadruple H-bonding interaction between UPy side groups acts as supramolecular crosslinkers enabling the TPU elastomer to have improved mechanical properties (tensile strength up to 25 MPa and toughness ~100 MJ m −3 ), and simultaneously the plasticizer effect of dangling side chain endows it with efficient healing ability at elevated temperatures (80–100 °C) comparable to its linear analogues. This strategy shows great potential in designing robust self-healing TPU elastomer employing weak dynamic covalent bonds , with wide promising applications as wearable electronics, coatings and adhesives.
研究领域:
材料科学
·
聚合物化学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zongxu Liu,Wenyan Wang,Jin Liu,Baolei Zhu,Guoxian Zhang,Jinxin Wang,Hepeng Zhang,Qiuyu Zhang
Nacre-mimetic strategy provides an enlightening approach to design high-performance bioinspired nanocomposites. Yet, it is still a big challenge to integrate excellent mechanical properties and tunable multifunctionality into artificial nacre materials. Herein, we develop a pioneering strategy to simultaneously modulate the electrical conductivity and mechanical properties of nacre-mimetic nanocomposite films by controlling interlay supramolecular interactions. A series of novel waterborne polyurethanes with 2-ureido-4[1H]-pyrimidinone (UPy) quadruple hydrogen bonding motifs in the side-chains were elaborately designed and synthesized, and further assembled with Ti 3 C 2 T x MXene nanosheets to construct lamellar nacre-mimetic nanocomposite films with highly ordered nanostructure. This research revealed for the first time that merely varying the content of UPy groups on polyurethane realize significant modulation of mechanical properties, electrical conductivity, and even the electromagnetic shielding effectiveness of nacre-mimetic nanocomposites. Strikingly, the tensile strength of the nanocomposites can be improved from 87.91 to 136.96 MPa and the electrical conductivity from 3214.0 to 4136.1 S cm −1 when the UPy content is increased from 0 to 15%. Additionally, the nacre-mimetic nanocomposite film is capable of fast responsive Joule heating performance at low trigger voltage. This work would open up a new avenue for fabricating multifunctional and mechanically robust biomimetic nanocomposites.
研究领域:
材料科学
·
纳米技术
·
复合材料
·
仿生学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Ji Ma,Kaili Zhang,Lili Du,Xujie Wang,Zhijie Chen,Hao Chen,Changfeng Chen,Ping Qiu
Corrosion-resistant coatings with self-healing capabilities are still a great challenge for metal protection. In this study, a corrosion-resistant coating with intrinsic self-healing capabilities was developed by compounding hydroxy-terminated silicone oil (HTSO) with 2-ureido-4[1H]-pyrimidone (UPy) derivatives. The smooth surface of the coating was shown by scanning electron microscopy (SEM), and good smoothness was also exhibited in the cross-section, which indicated that the coating is very homogeneous from the top to the bottom. Thermogravimetric analysis (TG) was employed to illustrate the temperature-resistant characteristics of the coating, revealing its significant chemical stability up to 360 °C. The corrosion resistance of the coating is assessed through electrochemical impedance spectroscopy (EIS), the typical impedance at 0.01 Hz is 1.70 × 109 and 2.44 × 108 Ω·cm2 before and after exposure to a 3.5 wt % NaCl solution for 70 days. There was no significant change in the water contact angle of the coatings before and after immersion; however, the adhesion strength was reduced. Notably, the coating demonstrates immediate and multiple self-healing properties. The tensile stress of the associated healing sample experiences an augmentation within the temperature range of 30–120 °C, with the critical fracture strain of the healed sample reaching 235% at 120 °C. The self-healing mechanism of the coating is systematically investigated using in situ Raman spectroscopy.
研究领域:
材料科学
·
化学工程
·
表面科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Horizons
·
2023
·Vol. 10
·期 8
·2968-2979
·
IF 13.3
Tong Liu,ChuanLong Li,Hai Yao,FuYao Sun,Lin Wang,BoWen Yao,JianHua Xu,JiaJun Fu
Soft self-healing materials are crucial for the development of next-generation wearable electronics that could function in dynamic environments and resist mechanical damage. However, several challenges remain, including fatigue fracture, poor elasticity, and thermodynamic lability, which significantly limit their practical applications. Here, with a model system of soft self-healing polyurea, we propose a molecular engineering strategy of transforming inherently fragile materials with an island-like structure into resilient ones with a bicontinuous nanophase separation structure using 2-ureido-4-pyrimidinone (UPy) supramolecular motifs as structural regulators. The dynamic and continuous hard domains modified by UPy formed a repairable bicontinuous network similar to those of the reticular layer in animal dermis. This design allows for a simultaneous and tremendous improvement in the fatigue threshold (34.8-fold increase), elastic restorability (the maximum elongation for full dimensional recovery increasing from 6 times to 13 times), and thermodynamic stability (4 orders of magnitude improvement in the characteristic flow transition relaxation time), without significantly compromising the compliance, autonomous self-healing, and optical transparency. These mechanical and thermodynamic improvements address current limitations in unfilled soft self-healing materials as reliable substrates for transparent strain-electronics.
研究领域:
材料科学
·
纳米技术
·
聚合物化学
·
可穿戴技术
·
自愈材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Biofabrication
·
2020
·Vol. 12
·期 4
·045003
·
IF 8.213
Huimin He,Duo Li,Zifeng Lin,Liuqi Peng,Jirong Yang,Mingming Wu,Delin Cheng,Haobo Pan,Changshun Ruan
The development of exceptional bioinks with excellent printability, high fidelity, and excellent cell viability maintenance for extrusion bioprinting remains a major challenge. Gelatin is an ideal candidate bioink due to its biocompatibility, biodegradability, and non-immunogenicity. However, its inherently low viscosity and unstable physical gelation under physiological conditions make it unsuitable for direct extrusion bioprinting of tissue-like gelatin constructs with high fidelity. Herein, sequential chemical modification using reversible quadruple-hydrogen-bonded ureido-pyrimidinone (UPy) and enzyme-responsive tyramine moieties (Tyr) were devloped to endow the gelatin with a temperature-programmable viscosity and enzyme-controlled solidification, thus realizing enhanced printability and superior fidelity. As demonstrated in a proof-of-concept study, various cell-laden constructs were built based on our modified gelatin, including two-dimensional human bone marrow mesenchymal stem cell (hBMSC)-laden patterns, three-dimensional interconnected hBMSC-laden scaffolds, a reversible twisting-tension human-scale hBMSC-laden ear, a bicellular tibia-like construct containing hBMSCs and endothelial cells and a hexagonal prism-shaped hepatocyte-laden scaffold. The loaded cells in the construct have high viability of over 90% at 24 h, and show proliferation and protein secretion over one week, suggesting that Gel-UPy-Tyr-based constructs under physiological temperature not only can keep high fidelity, but also can support the growth and functions of the loaded cells.
研究领域:
生物医学工程
·
组织工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2013
·
IF 2.562
Wengui Weng,Xiuli Fang,Huan Zhang,Huiying Peng,Yangju Lin,Yinjun Chen
Macromonomers bearing tridentate 2,6-bis(1,2,3-trizol-4-yl)pyridine (BTP) ligand unit synthesized via CuAAC “click” chemistry in the middle of the chain and two ureidopyrimidinone (UPy) motifs on the ends linked to the central BTP unit via PEGs of various lengths were synthesized and used for the study of gelation both with and without the presence of Eu(III) ions. Various interesting gelation behaviors were found. Gels exhibited various multi-responsive properties, including photoluminescence, mechanoresponsive properties, self-healing abilities, thermorepsonsive properties and chemoresponsive properties. The different gelation abilities and multi-responsive properties for different systems were shown to be resulted from difference in PEG linker lengths and the introduction of orthogonal metal–ligand coordination and hydrogen bonding interactions. The selective responsiveness to different chemicals would allow the development of modular sensory systems that utilize a combination of orthogonal supramolecular interactions.
研究领域:
超分子化学
·
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）