POLYMER
·
2018
·
IF 3.483
Zhenjie Ding,Li Yuan,Qingbao Guan,Aijuan Gu,Guozheng Liang
Muti-functional shape memory materials based on epoxy resins (EP) with different concentration of chain-extended bismaleimide resins (CBMI) were fabricated. The resulting EP/CBMI polymers have high glass transition temperature (T g : 93–125 °C), excellent thermal stability and good mechanical property. Unlike traditional shape memory polymers (SMPs), EP/CBMI SMPs are capable of shape reconfiguration and self-healing abilities. EP/CBMI polymers have high cycle-life shape memory property at high temperature, and their original shapes can be quickly recovered within 21 s by thermal activation method. Because of dynamic transesterification , EP/CBMI polymers can exhibit plasticity and reconfigure their shapes when heated to the temperature of dynamic transesterification (200 °C). For the same reason, EP/CBMI polymers also exhibit good healing behavior, and a 77.5–86.5% recovery of fracture toughness can be obtained after the fractured EP/CBMI polymers are healed at 200 °C/2 h.
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International Journal of Nanomedicine
·
2015
·
IF 4.383
Xiaoxiao Wen,Yudong Zheng,Jian Wu,Lu-Ning Wang,Zhenya Yuan,Jiang Peng,Haoye Meng
Bacterial cellulose (BC) is an alternative nanostructured biomaterial to be utilized for a wide range of biomedical applications. Because of its low bioactivity, which restricted its practical application, collagen and collagen hydrolysate were usually composited into BC. It is necessary to develop a new method to generate covalent bonds between collagen and cellulose to improve the immobilization of collagen on BC. This study describes a facile dialdehyde BC/collagen peptide nanocomposite. BC was oxidized into dialdehyde bacterial cellulose (DBC) by regioselective oxidation, and then composited with collagen peptide (Col-p) via covalent bonds to form Schiff’s base type compounds, which was demonstrated by the results of microstructures, contact angle, Col-p content, and peptide-binding ratio. The peptide-binding ratio was further affected by the degree of oxidation, pH value, and zeta potential. In vitro desorption measurement of Col-p suggested a controlled release mechanism of the nanocomposite. Cell tests indicated that the prepared DBC/Col-p composite was bioactive and suitable for cell adhesion and attachment. This work demonstrates that the DBC/Col-p composite is a promising material for tissue engineering and regeneration.
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OPTICAL MATERIALS
·
2015
·
IF 1.981
Wenjun Zhang,Haiyan Wang
A novel precursor PMA–Si was synthesized by modifying 1,2,4,5-benzene-tetracarboxylic acid (PMA) with 3-aminopropyltriethoxysilane (APTES). Then the hybrids were prepared by PMA–Si coordinating to lanthanide ions (Eu 3+ and Tb 3+ ) in sol–gel process. In order to improve luminescent efficiency, 1,10-Phenanthroline (Phen) was introduced to the system as the second ligand. As-prepared compounds in sol condition were coated on quartz plates to form a layer of thin film, which was different from other similar hybrids. The properties of the hybrids were characterized by FT-IR, fluorescence spectra, TG and SEM. The results showed that the obtained materials enhanced thermal stability, mechanical resistances, waterproofness as well as machining properties.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Qile Chen,Tong Ye,Shujuan Yang,Linwang Fan,Chaonan Shang,Yuhong Feng,Jiacheng Li,Yujuan Wang,Gaobo Yu,Jun Dai
The effective management of Type 2 Diabetes Mellitus (T2DM) depends on the development of streamlined, sustainable, and intelligent delivery systems. In this context, targeted stimulus-responsive Pickering emulsions (PEs) derived from biomass have emerged as a promising candidate. However, the interfacial films of PEs exhibit insufficient strength to endure the harsh gastric environment and lack the capability for targeted and responsive delivery. To address these limitations, an amphiphilic phenylboronic acid-functionalized sodium alginate (SA-PBA) was integrated into a ternary complex platform composed of soybean protein-isolated polyphenol (SPI-PSPAs), where it self-assembled into soft colloidal particles through multiple non-covalent interactions. A multiscale coupling methodology was proposed to investigate and elucidate the structure-function relationship between interfacial characteristics (e.g., thickness, viscoelasticity, and microstructures) and the stability of PEs, thereby providing a foundation for effectively controlling their targeted delivery properties. Notably, owing to the enhanced strength of the interfacial composite particle films, the PEs demonstrated the ability to withstand the harsh gastric environment while maintaining their structural integrity. Furthermore, the self-assembly process of the soft SA-PBA@SPI-PSPAs colloids could be modulated by external glucose stimuli, enabling the targeted and intelligent release of PSPAs in the intestinal environment. Consequently, the well-designed PE system achieved intestinal-targeted responsive release effects, highlighting the potential of the natural α-glucosidase (αG) inhibitor PSPAs as a viable clinical treatment for T2DM.
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Gels
·
2025
·Vol. 11
·期 8
·623
·
IF 5.3
Yu Wang,Fan Zhang,Liangbin Dou,Yutong Li,Kaiwen Wang,Zhengli Shi,Leyao Du,Wangyuan Zhang,Zonglun Wang
To address the issue of drilling fluid performance drop and wellbore instability induced by desorption between treatment agents and clay in the high-temperature environment of ultra-deep drilling, this study synthesized three organosilicon polymers (ADE, ADM, ADD) with different substituents. The study confirmed that the covalent bond significantly improved the high-temperature adsorption resistance of clay, which is closely related to the interface behavior of gels. Through rolling recovery, rheology, and filtration experiments for performance evaluation, these organic silicon polymers showed excellent high-temperature performance: the shale rolling recovery rate exceeded 80% at 210 °C, and the filtration loss was reduced to 14 mL, with a reduction rate of 53.3%. The adsorption capacity of the three polymers on clay remained unchanged from 150 °C to 210 °C, among which the adsorption amount of trimethoxy groups stabilized at 8–11 mg/g after 150 °C. The adsorption capacity of ethoxy groups increased by 7.9% at 150–210 °C. The adsorption capacity of dimethoxy groups with methyl steric hindrance increased by 28.1% at 150–210 °C. These results indicate that covalent bonds effectively enhance the high-temperature adsorption of clay, allowing for polymer molecules to firmly anchor on the clay surface at high temperatures. This breakthrough overcomes the limitations of traditional inhibitors in high-temperature desorption, and provides a valuable reference for the preparation of high-temperature adsorption resistant functional materials in water-based drilling fluid gel systems.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Bo Qian,Yuepeng Wang,Zekai Wu,Yujie Jia,Ming Liu,Jilin Su,Yihan Wang,Zhechen Zhao,Jiani Wu,Wei Sun,Ming Tian,Zhengwei You
High adhesive strength and reversible rapid bonding are a long-lasting trade-off in polyurethane adhesives; integrating these advantages remains a key challenge for developing next-generation polyurethane adhesives. Additionally, performance limitations in complex environments and the inability to monitor structural changes in the curing process persist as unresolved issues. Here, a dual-dynamic crosslinking polyurethane adhesive that combines thermally responsive oxime-carbamate bonds and Diels-Alder reactions are presented to achieve both strong reversible adhesion and environmental tolerance. The synergistic effect of dual dynamic bonds yields remarkable adhesive strength under ambient (11.51 MPa) and ultra-low temperature (−196 °C, 9.57 MPa) conditions, with adhesive strength 1.46-fold enhanced in the aqueous environment over 45 days. Through real-time monitoring of electrical property evolution during the curing process, the structural transformations responsible for the adhesive's enhanced performance characteristics are elucidated. This work establishes a robust framework for designing high-performance reversible polyurethane adhesives.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Hui Chen,Wengao Zeng,Yutang Liu,Wanyue Dong,Tao Cai,Lin Tang,Juan Li,Wenlu Li
It is important to find an effective way to enhance the photocatalytic efficiency of metal–organic frameworks. In this work, an organic supermolecule perylene diimide (PDI) semiconductor with a carboxyl terminal was added into the synthesis process of MIL-53(Fe) crystals. The PDI/MIL-53(Fe) (PM) composite photocatalyst was first obtained. The TC-H photodegradation rate of the most efficient 5PM was nearly 94.08% within 30 min, whose apparent reaction rate constant (k) is 4 times that of PDI and 33 times that of MIL-53(Fe), respectively. By investigation and characterization, it has been found that PDI nanofibers were dispersed and fixed in MIL-53(Fe) and bonded to each other by covalent bonds. The radical trap experiments and electron spin resonance analysis illustrated that hydroxyl radical (·OH), superoxide radical (·O2–), and photogenerated holes (h+) were active species. Combined with the band structure of PDI and MIL-53(Fe), it is proposed that the PM photocatalyst was a Z-scheme heterojunction mechanism. Therefore, PM photocatalysts showed excellent charge separation and transfer ability. The performance improvement of 5PM is due to enhanced visible light absorption, efficient charge separation, and excellent redox potential. Five cyclic photocatalytic tests and experiments further demonstrate that the 5PM photocatalyst has a promising future for pollutant removal.
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Polymers
·
2026
·Vol. 18
·期 12
·1418
·
IF 5.8
Xu Sun,Chen He,Yan Zhang
Epoxy resins are extensively utilized in various fields for their excellent comprehensive performance. However, the inherent brittleness and lack of reprocessing ability greatly limit their sustainability. In order to obtain reprocess ability in epoxy resin with superior mechanical properties and thermal stability, a curing agent (VA) and a hyperbranched epoxy toughening agent (HVT) containing disulfide and imine bonds have been synthesized from vanillin. Owing to the distinctive topological structure and abundant epoxy terminal groups of HVT, the modified epoxy resin (5HVT/E51/VA) exhibits high toughness, enhanced mechanical strength, and favorable thermal stability. When compared to the properties of the unmodified resin, the impact and flexural strength of 5HVT/E51/VA are increased by 55.32% and 71.63%, respectively. Its glass transition temperature (Tg) and 5% weight loss temperature (Td5%) are also enhanced by 4.74% and 11.33%, respectively. Moreover, the resins are highly stable in most solvents, but can be completely degraded in hexylamine/2-mercaptoethanol (HAE/2-ME) solution within 2.5 h. The resin also displays notable scratch-healing capability, and the healing efficiencies reach above 85%. Even after three reprocessing cycles, their strength retention rate exceeds 80%, suggesting excellent sustainability potential. This research provides a sustainable method for preparing high-performance epoxy resins, suggesting their potential applications in self-healing and reprocessable composites.
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INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Panpan Song,Liuping Du,Jiuyin Pang,Guiquan Jiang,Jianmin Shen,Yanli Ma,Shixue Ren,Shujun Li
Conventional epoxy asphalt is a thermosetting material that is difficult to reprocess and cannot be easily recycled after disposal. In this study, a lignin-based epoxy asphalt (ELEA) with thermoplastic and thermosetting properties was prepared by introducing a lignin-based vitrimer system, which has a dynamic, covalently bonded, cross-linked ester network, into the asphalt. The mechanical properties (tensile strength, 1.605 MPa; elongation at break, 382.38 %) also meet the requirements of epoxy asphalt for steel bridge deck pavement. The viscosity, thermal properties and high-temperature reversibility of ELEA show that ELEA has good operability, thermal stability and potential for recycling, in line with the trend towards the development of a circular economy. The use of biomass-based derivatives for the epoxy resin and curing agent in ELEA also reduces dependence on non-renewable petroleum resources and provides a useful reference for the high-value and efficient development and utilization of industrial lignin.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2020
·
IF 6.444
Dong An,Xiaoyuan Duan,Shuaishuai Cheng,Zhiyi Zhang,Bo Yang,Qingsong Lian,Jiaxiong Li,Zhijian Sun,Yaqing Liu,Ching-Ping Wong
With the rapid development of electronic integration technology, the timely and efficient heat dissipation capacity has become increasingly important to ensure reliability and lifetime of electronics. Thermal interface materials (TIMs) were considered as the best candidate to tackle this issue. In this work, the three-dimensional structures with covalent bond connections of boron nitride/natural rubber (BN/NR) thermal interface composites were successfully prepared and its possessed an ameliorated through-plane thermal conductivity of 0.79 W m −1 K −1 when BN content were 25 wt%. The results demonstrated that three-dimensional network structures and chemical interactions between BN and NR had a significant contribution in reducing interfacial thermal resistance. Meanwhile, the sensitive thermal response, satisfactory electrical insulation and good mechanical properties made its own high probability for the TIMs applications. Importantly, this tactics created a new means to construct elastomer-based thermal management materials and applied for the electronic packing materials.
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EUROPEAN POLYMER JOURNAL
·
2025
·
IF 6.3
Jiaofeng Ye,Haocheng Liu,Danbin Zhu,Chenyang Guo,Yanhua Liu,Libang Feng
A self-healing polyurethane with five-fold response to thermal, near-infrared light, microwave, sunlight and UV light is prepared by introducing amino-functionalized copper sulfide (CuS-NH 2 ) nanoparticles into thermally reversible polyurethane containing both Diels-Alder and disulfide bonds. The prepared polyurethane exhibits optimal comprehensive mechanical properties and self-healing performance when the addition amount of CuS-NH 2 is 0.3 wt%. The polyurethane with quite high tensile strength (14.3 MPa), hardness (75 HA), elongation at break (625 %), and toughness (24.85 MJ/m 3 ) can be obtained. Cracks in the modified polyurethane can be self-healed repeatedly through heat-treated at 120 °C for 6 min, or irradiated with 4 W/m 2 of near infrared light at a wavelength of 808 nm for 60 s, or treated under a 250 W microwave for 80 s, and followed by a heat treatment for 12 h at 60 °C. More importantly, the damaged sample can also be repaired multiply after being treated to simulated sunlight or irradiated with 250–380 nm UV light for 6 h. Results show that the quickest self-healing speed and highest repair efficiency can be resulted when the materials are exposed to near-infrared light. The self-healing behavior is achieved through the cooperation of thermo-reversible Diels-Alder reaction, disulfide bonds exchange, dissociation and regeneration of hydrogen bonds, directional migration of CuS-NH 2 nanoparticles. These findings give important implication for the development of multi-responsive self-healing materials with efficient self-healing capability. Meanwhile, it provides various ideal selections for damage repair under different environments.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2025
·
IF 4.6
Jinzhi Lv,Xianxin Wu,Jin Wei,Tao Zhang,Yan Gong,Yanming Miao
Visible light is a more accessible and less phototoxic excitation light source in practical applications than ultraviolet light. However, it's still a challenge to prepare visible-light-excited carbon-dot long-afterglow photochromic materials. In this study, a carbon dots/boronic acid composite (CDs/BA) based on boron–carbon bond (B C) was synthesized. The CDs/BA under visible light excitation had a long-afterglow emission spectrum mixed of thermal activation delayed fluorescence (TADF) and room temperature phosphorescence (RTP), with an absolute photoluminescence quantum yield (PLQY) up to 30.35 %. After removed the visible light excitation source, the long afterglow lasted for more than 30 s. Moreover, the long afterglow emission of CDs/BA is excitation-dependent and time-dependent. On this basis, the anti-counterfeiting technology with more convenience (a mobile phone or flashlight can be used as a light source) and higher security was achieved.
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危险品化学品经营许可证（带存储）