Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 44
·30398-30408
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IF 10.7
Ning Ding,Yi Yang,Wei Zhou,Debora Puglia,Pengwu Xu,Deyu Niu,Weijun Yang,Piming Ma
A common approach for developing thermosetting polymers with self-healing performance is to introduce covalent adaptive networks into crosslinked systems. However, most self-healing polymers were conducted in “integral big materials”, which means “high energy consumption” and hard to carry out especially for those products with complex structures. In this work, thermosetting polythiourethane (PTU) dynamic networks with remote ultrafast infrared “welding” performance were designed. At first, biobased PTUs were synthesized by tailoring the crosslinking networks, which contain dynamic thiocarbamate bonds. Then, MXene, used for photothermal stimulation, was incorporated into the crosslinked PTU networks. The tensile strength and modulus of PTU ranged from 23.7 to 64.0 MPa and 17.4 MPa to 1.95 GPa, respectively, while the Tg could be tuned up to 83.4 °C. Moreover, due to the excellent photothermal conversion behavior of MXene and the reversibility of the dynamic thiocarbamate bonds, the PTU/MXene nanocomposites showed interesting remote and ultrafast infrared “welding” performance via the precise photothermal self-healing of the physical damage within 120 s. Meanwhile, the crosslinked PTU showed excellent intrinsic flame-retardant properties. This study may provide a novel strategy to facilitate the self-healing process for thermosetting polymers.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Liuwei Chen,Jiayue Lao,Jintao Ma,Zerui He,Wanwan Fu,Jiesheng Liu,Hao Peng,Tao Fang,Yanshu Luo
In this study, a methyl palmitate-polyurea phase change microcapsule (MPCM) was successfully synthesized by interfacial polymerization with methyl palmitate with high latent heat as the core material and tolylene-2,4-diisocyanate (TDI) and diethylene triamine (DETA) as the shell monomers. The effects of emulsifier type and content, cosolvent, reaction rate and core-shell mass ratio on the phase change properties of microcapsules were systematically discussed, and the optimum process was determined. A series of characterization techniques were used to analyze the composition, crystal structure, morphology, microstructure, particle size distribution and thermal performances of the microcapsules. The experimental results presented that the microcapsules synthesized under the optimal conditions had outstanding encapsulation efficiency (72.42 %) and encapsulation rate (70.77 %) with melting temperature and solidification temperature of 27.2 °C and 13.8 °C, and melting enthalpy and solidification enthalpy of 160.5J/g and 157.3J/g, respectively. Moreover, the resulting microcapsules had regularly spherical morphology with compact and smooth surface, and uniform particle size distribution with average particle size of 909.94 nm. Meanwhile, the microcapsules possessed excellent thermal stability, low thermal conductivity (0.2932 W K −1 m −1 ) and excellent thermal reliability. These characteristics made methyl palmitate-polyurea MPCMs have a broad application prospect in the field of thermal insulation.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yifei Zhang,Shuxin Xu,Jiarui Liu,Kaiyuan Zhang,Yu Guan,Shaoxiang Li
Developing high-performance polymer composites with self-healing and recyclable performance is crucial for long-term durability of the devices. This paper presents a novel method by incorporating carbon quantum dots (CQDs) into the chain extension reaction of polymers to construct self-healing polyurethane-urea (PUU) with excellent integrated mechanical and multi-recyclable properties. By the introduction of the CQDs with surface containing ample amide, carboxyl, and hydroxyl groups, the cross-linking networks are formed, and simultaneously, abundant H-bonds at the interface between CQDs nanospheres and PUU matrix provide strong interfacial interactions, which endows material reinforcement and self-healing effect. The addition of a very low amount of CQDs (0.15 wt%) can significantly improves the mechanical performance, especially the tensile stress and toughness, which increased about 74.4 % (35.2 MPa to 61.4 MPa) and 115.2 % (34.8 MJ·m −3 to 74.9 MJ·m −3 ), respectively. Besides, unlike other nanofillers, the addition of CQDs (more than 1 wt%) enables the PUU with excellent self-healing and recycling properties, and for 3 wt% addition, the room temperature self-healing efficiency can even achieve 97.0 % for 24 h without external intervention. Furthermore, the addition of the CQDs can also significantly the damping effect of the polymers. It is highly anticipated that the research will provide a facile method to construct high performance polymer materials.
研究领域:
材料科学
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高分子化学
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纳米技术
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DOI
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Kunyang Zhou,Kaiqiang Zhang,Luping Wang,Yu Tan,Yuwen Meng,Xu Li,Xu Wang
The pursuit of protective materials that strike a perfect balance between flexibility and superior impact resistance continues to drive significant advancements in material science, despite the inherent limitations of conventional materials. This study introduces a class of supramolecular poly(urethane-urea) elastomers, carefully designed by combining polycaprolactone soft segments with hydrogen bond-rich hard segments. This unique composition not only provides exceptional quasi-static mechanical properties, ensuring durability under everyday use, but also excels in dynamic mechanical properties essential for protection against high-speed impacts. These elastomers exhibit outstanding tensile strength, toughness, and impact resistance, outperforming existing commercial materials. Their remarkable performance is attributed to a supramolecular network structure with strong interactions between the soft and hard segments, which efficiently redistribute and dissipate energy through deformation and dynamic hardening. Furthermore, the reversible hydrogen bonds within the polymer matrix enhance the self-healing capabilities and recyclability of these materials, offering a sustainable solution for high-performance protective gear.
研究领域:
材料科学
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工程学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xubao Jiang,Diankai Zhang,Yujun Wang,Ruiqing Wang,Xiang Zheng Kong,Xiaoli Zhu,Shusheng Li,Xiangling Gu
Raspberry-like microspheres have been widely used as superhydrophobic materials, photonic crystals, drug carriers, etc. Nevertheless, their preparation methods, usually consisting of multiple steps, are generally time- and energy-consuming. Herein raspberry-like SiO2@polyurea microspheres (SiO2@PUM) are readily prepared via a one-step precipitation polymerization of isophorone diisocyanate in a H2O/acetone mixture with the presence of SiO2 particles. The sphere size, surface roughness, and SiO2 content of SiO2@PUM are easily adjustable by varying the experimental conditions. TEM and SEM observations reveal that the final SiO2@PUM exhibits a core–shell structure, with polyurea (PU) in the core and SiO2 particles as the shell. In the process, the SiO2 particles were initially located on the PUM surface as a monolayer. With the reaction proceeding, the monolayer of SiO2 particles became thicker, forming a thicker layer of SiO2 particles on PUM due to the accumulation of SiO2 particles, leading to a multilayer structure of SiO2 particles on the shell of SiO2@PUM. The formation mechanism of the raspberry-like SiO2@PUM was thoroughly discussed and ascribed to electrostatic attraction between the positively charged PU and negatively charged SiO2 particles. Once dried, SiO2@PUM was superhydrophobic and turned hydrophilic if water-wetted. Using a layer of SiO2@PUM, effective separation with good reusability for a variety of oil–water mixtures was achieved regardless of the oil density and types of oil–water emulsions. This work presents a novel protocol for the preparation of raspberry-like microspheres with tunable wettability via a rapid and green process, and the resulting microspheres are highly effective for the separation of diverse types of oil–water mixtures.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Jiandong Wang,Yuxing Jiang,Zhuangzhuang Tian,Jun Li,Yang Jin,Jianjun Chen,Yubin Wang
The traditional wet-process phosphoric acid has higher economic benefits than the thermal-process phosphoric acid, but introduces many metal ion impurities, which limits the application of phosphoric acid. In highly concentrated phosphoric acid solutions, phosphoric acid mainly exists in molecular form. Due to the surface charge and appropriate pore size of the nanofiltration (NF) membrane, it exhibits high selectivity for phosphoric acid and its impurities. However, because of the uncontrolled diffusion of monomers and rapid polymerization, the pore size distribution becomes highly uneven. Meanwhile the extremely low pH and high viscosity of the phosphoric acid compromise the stability and permeance of commercial membranes. We identified that the organic monomer benzene-1,3-disulfonyl chloride (BDSC) exhibits a capping effect when reacting with the aqueous phase of branched polyethyleneimine (PEI) which allows the newly formed membrane to regulate the subsequent diffusion and reaction of hexamethylene diisocyanate (HDI), thereby optimizing the membrane structure. By adjusting the concentration of BDSC, the pore size of the membrane layer was optimized. The final average pore size was determined to be 0.33 nm. The membrane exhibited an average ion rejection of over 65 % when tested in a 20 wt% P 2 O 5 solution, while maintaining a very low rejection rate of only 1.74 % for phosphorus. The permeance reached 1.21 L/h m 2 bar, surpassing that of traditional commercial membrane operating at less than 1 L/h m 2 bar under 10 wt% P 2 O 5 conditions. This study employed the capping effect to adjust the membrane structure and pore size, demonstrating that spatial sieving is the main mechanism for ions purification in phosphoric acid. Long-term acid resistance tests confirmed the stability of the poly (sulfonamide-urea) NF membrane during phosphoric acid purification process. This work shows that this new nanofiltration membrane exhibits promising prospects for application within acidic high-viscosity systems.
研究领域:
化学工程
·
材料科学
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产品关联
DOI
高影响因子
Small
·
2023
·Vol. 20
·期 12
·2307492
·
IF 13.3
Xue Bi,Kunpeng Song,Ye-Tang Pan,Camila Barreneche,Henri Vahabi,Jiyu He,Rongjie Yang
A dodecahedral superstructure consisting of a single layer of Janus spheres containing ZIF-67 nanodots is prepared by in situ polymerization, with ZIF-67 and bio-based phytic acid (PA) as templates and dopants. It is used to improve the flame retardant, electromagnetic (EMI) shielding, and thermal conductivity properties of polyurea (PUA). By adding 5 wt% polyaniline@cobalt phytate-2.0 (PANI@Co-PA-2.0), the peak of heat release rate and the peak of smoke production rate are reduced by 54.9 and 59.9%, respectively. The peak of CO and CO 2 production also decreased by 46.2 and 53.1%, respectively. A decrease in the absorption intensity of aliphatic and aromatic volatiles is also observed. The fire safety of PUA is greatly improved. In addition, PUA/PANI@Co-PA-2.0 exhibits an EMI shielding capability of 22.4 dB with the help of reduced graphene oxide, which confirms the possibility of PUA material application in the field of electromagnetic shielding. The 5 wt% filler increases the tensile strength of the PUA matrix to 6.3 MPa, and the composite material obtains good thermal conductivity. This work provides a viable method for the preparation of a flame-retardant, conductive, and electromagnetic refractory PUA substrate.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
LIQUID CRYSTALS
·
2014
·
IF 2.349
Fafu Yang,Jin Yuan,Congcong Li,Hongyu Guo,Xiaoyun Yan
Series of triphenylene derivatives with multiple NH groups 3a, 3b, 4a, 4b, 5a and 5b were designed and synthesised by simple procedures in high yields. Their structures were confirmed by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), mass spectrometry (MS) and elemental analysis. Their mesophase behaviours were studied by differential scanning calorimetry, polarising optical microscopy and X-ray diffraction. The triphenylene derivatives 3a and 3b with two NH groups and triphenylene derivatives 4a and 4b with three NH groups possess excellent mesomorphic properties. Compounds 4a and 4b exhibited wider mesophase than compounds 3a and 3b. Triphenylene derivatives 5a and 5b with five NH groups have no mesomorphic properties. These results suggested the units of hydrogen bonds played the crucial roles on mesomorphic properties and acylthiosemicarbazide group with three NH groups was a good functional group for producing excellent mesomorphic properties.
研究领域:
材料化学
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物理化学
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DOI
高影响因子
Journal of Energy Chemistry
·
2019
·
IF 5.162
Pin Wang,Ziyu Yin,Linfeng Gao,Hui Li,Tongyu Zhang,Qing Shen,Jun Lv,Yingfang Yao,Wenjun Luo,Zhigang Zou
Photoelectrochemical water splitting can convert solar energy into clean hydrogen energy for storage. It is desirable to explore non-precious electrocatalysts for practical applications of a photoelectrode in a large scale. Here, we developed a facile spin-coating and in-situ photoelectrochemical reduction method to prepare a dispersed Cu electrocatalyst on a Si photocathode, which improves the performance remarkably. We find that thiourea in the precursor solution for spin-coating plays an important role in obtaining dispersed Cu particles on the surface of a Si photoelectrode. With thiourea in the precursor, the Cu/Si photocathode shows higher performance than the one without thiourea. Moreover, the Cu/Si photocathode also indicates good stability after 16 h illumination.
研究领域:
材料科学
·
能源化学
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DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Yunshu Jiang,Yunlong Chen,Futing Zi,Xianzhi Hu,Shuliang Chen,Puqiang He,Li Zhao,Xinrong Li,Jiao Li,Yue Lin,Zhujuan Li
Compared with the cyanide method, the thiosulfate method is a green and clean gold production method, while gold recovery from thiosulfate solution is pending. Although the activated carbon adsorption method has been highlighted, current studies cannot avoid the complexity of activated carbon modification. This study used thiosemicarbazide (TSC) as the additive of the gold solution, investigating the gold recovery performance of pristine activated carbon and its adsorption mechanism. As a result, even for containing gold 100 mg/L, gold adsorption percentage close to 100% could be achieved on original carbon within 12 h when adding 0.02 g TSC. Next, under the optimal conditions, gold loading amount of 42.6 kg/t was attained after five-stage adsorption. Characterization via XPS , FT-IR, BET, and UV–vis verified the gold adsorption mechanism was related to TSC's decomposition into SCN − under activated carbon's catalysis, the formation of Au(SCN) 2 - and whose adsorption on the surface of original carbon. Furthermore, it was found that this method exhibited well gold recovery ability (99%) for gold in both Cu 2+ -en-S 2 O 3 2− and Cu 2+ -NH 3 -S 2 O 3 2− solutions; Additionally, well gold recovery performance (99%) was also achieved for two leaching solutions (Au: 35 and 42 mg/L, Cu 2+ : 3178 mg/L) of an actual ore. Last, gold desorption studies indicated that a good gold desorption rate of 95.3% was achieved within 24 h for carbon containing 5 kg/t of gold when using N, N-dimethylformamide (DMF) as desorbent . This paper gifted untreated activated carbon with excellent adsorption ability towards gold in thiosulfate system for the first time, which is meaningful for the cleaner production gold.
研究领域:
环境科学
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材料科学
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冶金工程
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DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 26
·15762-15768
·
IF 3.108
Zideng Gao,Long Pang,Haojie Feng,Shunyi Wang,Qiuyun Wang,Mengyao Wang,Yining Xia,Shuwen Hu
Encapsulation of pesticides with polymeric materials is a promising approach to improve the efficacy of pesticide application and reduce the potential risks of pesticides to the environment and humans. In this study, a novel imidacloprid microcapsule was prepared by depositing a polydopamine (PDA) layer on imidacloprid via oxidative self-polymerization followed by a polyurea (PU) layer on PDA via copolymerization. No organic solvent or surfactant was used in the preparation process. The entrapment rate of imidacloprid was determined to be 47.28 ± 0.87%, and the pesticide loading of microcapsule was 68.36 ± 1.13%. Several characterization assays, such as Fourier infrared transform analysis, thermogravimetric analysis and contact angle analysis, were conducted to confirm the encapsulation of imidacloprid. Dynamic light scattering showed that the microcapsule size ranged from hundreds of nm to several μm, which was similar to the results obtained by scanning electron microscopy. The microcapsule had a stable dispersion up to one month in the aqueous solution. Moreover, the microcapsule was able to release imidacloprid in a sustainable manner, as the release was much slower than the non-encapsulated imidacloprid.
研究领域:
农业化学
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材料科学
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环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Man Wang,Zhipeng Zhang,Qingyi Xie,Jiansen Pan,Chunfeng Ma,Guangzhao Zhang
Polyurea has found applications in protective coatings. Yet, the too fast polymerization and lack of functions limit its application. Herein, we report a high-performance polyurea via the stepwise polymerization of an isocyanate (NCO)-terminated prepolymer consisting of poly(propylene glycol)-block-poly(ethylene glycol)-block-poly(propylene glycol) (PPG-b-PEG-b-PPG) with a nanocluster synthesized via the hydrolysis of N-phenylaminomethyltriethoxysilane. Such a nanocluster contains low-reactivity secondary amines, so the polymerization of polyurea can be slowed down (over 1 h), which improves its wetting and adhesion to a substrate. The residual silanol groups on the nanocluster further increase the adhesion. Such polyurea exhibits high adhesion on various substrates, including glass, ceramic, steel, copper, titanium, wood, and natural rubber (∼2.35–14.64 MPa). Besides, the nanoclusters can cross-link the prepolymer into a tough network, endowing the polyurea with a high mechanical strength of ∼25 MPa, much higher than the traditional polyaspartic ester polyurea. On the other hand, the PEG segments enable the polyurea to have good fouling resistance against proteins (fibrinogen absorption was reduced by over 90%), bacteria (RBA of S. aureusE. coli and Pseudomonas sp. was less than 10%), as well as diatom (diatom density was less than 100 cells/mm2). The polyurea is expected to find applications in biomedical engineering and marine antifouling.
研究领域:
材料科学
·
生物医学工程
·
海洋科学
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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）