SYNTHETIC METALS
·
2020
·
IF 3.286
Peng Zhang,Bin-bin Wang,Qiu-jin Xia,Jian Zou
Herein, a series of electrically conductive polyurethane composites with multi-walled carbon nanotubes (PU/MWCNTs) were in-situ polymerized according to tailoring the segmented PU molecules. The ultralow percolation threshold of MWCNTs (0.057 wt%) in the composites was achieved and the electrically conductive properties were markedly enhanced. The conductivity in PU@MWCNTs1-0.5 % and PU@MWCNTs2-0.5 % was lower than 1.0 × 10 −1 ° S m -1 . While PU@MWCNTs3-0.5 % had the conductivity of over 1.0 × 10 -6 S m -1 , almost 4 orders of significance, which was attributed to the increasing of hard segments on the PU molecule. Furthermore, the high piezoresistive properties of the composites were also observed. Therefore, this work had the important sense in decreasing the low percolation thresholds of conductive polymer composites.
研究领域:
材料科学
·
高分子科学
·
纳米技术
·
电气工程
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产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2024
·
IF 4.5
Linlin Yu,Ruoyu Chen,Qian Jia
Oily wastewater, especially oil-water emulsions, has caused severe environmental damage. It is urgent to develop a simple, efficient superhydrophobic and superoleophilic material to address this issue. In this work, a multifunctional sponge based on MOF was proposed. The hydroxy-assisted method was employed to prepare MOF-5 with metal coordination centers. Subsequently, octadecylphosphonic acid (OPA) was used to hydrophobically modify MOF-5 to prepare stable and hydrophobic OPA-MOF-5. Polydimethylsiloxane (PDMS) with low surface energy was employed as the adhesive, and the hydrophobic OPA-MOF-5 was loaded onto the polyurethane (PU) sponge to obtain the stable superhydrophobic OPA-MOF-5@PDMS@PU with a WCA of 155.9°. The produced modified sponge exhibited high sorption capacity and oil-water separation efficiency, with a sorption capacity of 26.7 (petroleum ether)-85.6 (chloroform) g/g and a separation efficiency of over 99 %. It has also shown satisfactory emulsion purification and flame retardancy capacities.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 70
·65756-65762
·
IF 3.289
Xiaoyan Song,Tao Li,Bowen Cheng,Jinfeng Xing
Open cage polyhedral oligomeric silsesquioxane (POSS) was firstly used to modify polyurethane (PU) to prepare a POSS–PU composite. Then a POSS–PU nanofiber membrane was prepared by electrospinning technology. The hydrophilic/hydrophobic properties, fiber morphology and biocompatibility of the POSS–PU nanofibers membrane were investigated. Contact angle increased by 24.3° for 2 wt% POSS–PU nanofibers membrane compared to PU. The ability of the nanofibers membrane surface to repel proteins and platelets was assessed by using platelet adhesion test and BSA static protein-adsorption experiment. Platelet adsorption amount obviously decreased compared with PU and very few platelet was adhered on the surfaces of nanofibers membranes when 1 wt% POSS was added. Protein adsorption was also decreased with addition of POSS. Hemolysis tests showed that hemolysis rate localized in the desired range of values (<5%) for all nanofibers membrane. Moreover, the antibacterial activity of nanofibers membranes was obviously improved after addition of POSS.
研究领域:
生物材料学
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医学工程
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Xue Yang,Yi Pu,Yifei Zhang,Xiaofang Liu,Jianxin Li,Ding Yuan,Xin Ning
In this study, a new barium titanate@polyurethane/polysulfonamide (BaTiO 3 @PU/PSA) composite nanofibrous membrane with comprehensive properties for high temperature filtration and robust PM2.5 removal was successfully fabricated through the blending spinning of PU and PSA and the introduction of BaTiO 3 . As a consequence, the BaTiO 3 @PU/PSA membrane achieved the high capture efficiency of 99.99 % for fine particulates, low pressure drop of 39.4 ± 0.2 Pa, good mechanical property (13.27 MPa), sufficient flexibility, high thermal stability (up to 300 °C), favorable flame-retardancy as well as superior chemical resistance against acid and alkali. Especially, to intuitively reveal the relationship between the fiber structure, high temperature environment, gas velocity and filtration performance of the composite membrane, the filtration processes were carefully investigated through the analog simulation. More importantly, the BaTiO 3 @PU/PSA membrane exhibited high-efficiency PM2.5 purification capacity, and the removal efficiency kept stable after high temperature, acid or alkali treatment, ascribing to the advantageous structure of PSA, PU and BaTiO 3 . Overall, the BaTiO 3 @PU/PSA nanofiber membranes with versatility are a promising high-efficiency candidate for dust removal, particularly in harsh conditions.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Lei Zhu,Hongye Lu,Tianci Huo,Dongxiao Liu,Zechen Yan,Jianqiang Zhang
The frequent oil leakage accidents cause huge loss of natural resources and serious damage to the ecosystem. Although all kinds of modified sponges have been invented to deal with the offshore oil spills, it is difficult to separate high viscosity crude oil and water-in-oil emulsions. To address these challenges, a modified polyurethane (PU) sponge (PDMS/MOF-74@PU) coated by polydimethylsiloxane (PDMS) with ultra-low surface energy after growing spindle-shaped metal–organic framework structure (MOF-74) on the PU sponge surface was prepared. With the advantages of super-hydrophobic and high porosity, the prepared sponge can selectively and effectively absorb various oils from oil/water mixtures and it has good oil adsorption capacity (18–55 g/g). Meanwhile, the black MOF-74 endows the PDMS/MOF-74@PU photothermal properties for the separation of high viscosity crude oil under the light conditions. As well as, the prepared sponge shows excellent separation performance for the water-in-oil emulsions, the amount of water in the oil could reduce to less than 20 ppm and the separation efficiency could reach as high as 99.9 % after separation. In addition, we used molecular dynamics to verify the mechanism by which PDMS coatings change the surface wettability of materials. With the excellent mechanical property, chemical stability, and thermal stability in various harsh environments, the PDMS/MOF-74@PU have a broad application prospect in the treatment of offshore oil spills.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 9
·4907-4915
·
IF 3.119
Yi Hou,Nan Jiang,Dan Sun,Yiping Wang,Xianchun Chen,Songsong Zhu,Li Zhang
Hydrogels demonstrate superior properties that favor wound healing and have been widely used in clinical settings for wound dressing applications. However, commercial hydrogel dressings often lack flexibility/adhesiveness, and do not conform well to the irregular skin surfaces of complex wounds and/or wounds near joints. As a result, the wound is likely to be exposed to potential bacterial invasion. Herein, we designed and developed a mechanically flexible and self-adhesive polyurethane-poly(acrylamide) (PU-PAAm) hydrogel for wound healing applications. The hydrogel can be cured from a novel waterborne emulsion within 90 s under UV irradiation. The PU component within the PU-PAAm hydrogel plays a “bridging” role that accelerates the formation of an interpenetrating polymer network (IPN), which consists of a physically crosslinked PU network trapped within a chemically crosslinked PAAm network. The unique IPN structure endowes the hydrogel with superior stretchability and ductility. The hydrogen bonding formation and electrostatic interaction between the hydrogel and skin ensure strong adhesion without causing irritation to skin upon dressing removal. Animal studies further confirmed the PU-PAAm hydrogel's remarkable skin regeneration capability. This work shows our new hydrogel holds a promising prospect for treatment of complicated or challenging wounds such as burns and chronic wounds.
研究领域:
生物材料学
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医学工程
·
组织修复与再生
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Zhihua Zhao,Zijie Su,Chunhua Zheng,Guixin Jin,Lan Wu
Given the considerable harm that NO 2 poses to the environment and human health, developing reliable NO 2 detection sensors is crucial. Herein, a flexible, multifunctional sensor was successfully synthesized through hydrothermal and the wet impregnation methods using an elastic PU yarn as the substrate. This sensor, named Au/VTe 2 /Ti 3 C 2 T x –PU, was characterized via X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopy to analyze its structure, chemical valence states, and micromorphology. At room temperature (23 °C), the sensor demonstrated an exceptionally high response to NO 2 gas, with a response value of 1.72 at 50 ppm as well as low response and recovery time of 33 and 38 s. Additionally, testing of the strain performance of Au/VTe 2 /Ti 3 C 2 T x –PU showed that this flexible sensor exhibits high strain sensitivity, excellent repeatability, and durability, making it suitable for detecting subtle human movements. Overall, the synthesized sensor is in considerable advantages in terms of both gas-sensing performance and tensile performance, exhibiting broad application prospects in human motion and health monitoring.
研究领域:
材料科学
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环境科学
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生物医学工程
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产品关联
DOI
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.2
Liu Xilin,Yang Fuwei,Yao Zhiqian,Wang Xuan,Liu Pengfei,Li Jiayin,Zhou Hu
Immobilizing the activator on the carrier is an effective strategy to solve the difficult recovery and secondary pollution of activator in advanced oxidation process. In this study, cobalt–aluminum-layered double hydroxide (activator) was immobilized on a PU membrane carrier (Co–Al-LDH@PU membrane) by a hydrothermal in situ growth technique to form a recyclable peroxymonosulfate (PMS) activator. The as-prepared Co–Al-LDH@PU membrane exhibited an excellent ability to activate PMS for the removal of tetracycline hydrochloride (TC). 97.20% of TC (30 mg L −1 ) was eliminated with Co–Al-LDH@PU membrane (3 × 3 cm 2 ) and 1.6 mM PMS at pH 5.5 in 30 min. Singlet oxygen ( 1 O 2 ) was verified as dominant reactive oxygen species responsible for TC removal via quenching tests. Mechanism investigation suggested that the redox cycle of Co 2+ /Co 3+ on the surface of Co–Al-LDH@PU membrane was crucial for PMS activation. Meanwhile, Co–Al-LDH@PU membrane displayed the ideal reusability and versatility.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yu Liu,Tianyi Hu,Shufei He,Likui Feng,Qingliang Zhao,Junqiu Jiang,Liangliang Wei
Inspired by the high sustainability, energy saving, cleanliness of photocatalysis (PC) with respect to antibiotics decomposition, we developed a stable, highly efficient Bi 2 Ti 2 O 7 @Bi 2 S 3 /polyurethane (BTO@Bi 2 S 3 /PU) photocatalytic system. It exhibited the best degradation performance with the removal of 82.08 % oxytetracycline (OTC) within 180 min under the optimal reaction parameters. Systematic characterization of BTO@Bi 2 S 3 /PU revealed its wider light-harvest capacity, higher electron–hole (e − –h + ) separation efficiency, lower interface resistance, and better redox potential in heterojunction. Based on electrochemical characterization and density functional theory calculation, the construction of Z-scheme BTO@Bi 2 S 3 photocatalyst substantially optimized the band structure. Moreover, the redox cycles of Bi 3+ /Bi 5+ and Ti 4+ /Ti 3+ further enhanced the charge transfer rate during the photoactivation process. For the OTC photodegradation pathways, ·OH, h + , ·O 2 − , and 1 O 2 dominated the pollutant decomposition and the toxicity of intermediates were decreased. Overall, the BTO@Bi 2 S 3 /PU photocatalytic system may provide a universal and stable technique for advanced photoheterojunction applications and wastewater purification.
研究领域:
环境科学
·
材料科学
·
毒理学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Zhiwei He,Hanqing Wu,Zhen Shi,Xing Duan,Shiyu Ma,Jiahao Chen,Zhe Kong,Aqing Chen,Yuping Sun,Xianguo Liu
The discharge of oily wastewaters is one of the major challenges in recent years due to its significant threat to the environment and human health. Herein, we prepared durable superhydrophobic/superoleophilic polyurethane (PU) sponge by decorating UiO-66-(COOH) 2 MOF nanoparticles via self-polymerization of dopamine and chemically modifying with low surface energy materials. Owing to the high mechanical and chemical stability of UiO-66-(COOH) 2 MOF nanoparticles, the MOF-PU sponge exhibits excellent chemical stability, thermal stability and mechanical durability in terms of being immersed in the corrosive mixtures and the boiling water, and the sandpaper abrasion tests, respectively. The MOF-PU sponge can absorb oils (or organic solvents) ranging from 29 to 56 times of its own weight, and shows an excellent separation efficiency for more than 96% even after 15 cycles. Besides, the MOF-PU sponge exhibits excellent anti-icing property with the icing delay time as long as 2040 s at − 15 ± 1 ℃. Thus, the MOF-PU sponge with above excellent properties has a great potential use in the practical application of efficient oil/water separation in the harsh environments.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Coatings Technology and Research
·
2022
·Vol. 19
·期 3
·977-988
·
IF 2.339
Xu Xinmeng,Zhou Zhongqun,Qin Liangrong,Yu Caili,Zhang Faai
It is difficult to produce coatings that have good mechanical and self-healing properties. In this study, polyvinyl alcohol/polyurethane/polyurea (PVA/PU/PUA) microcapsules (MCs) loaded with isophorone diisocyanate (IPDI) as core materials were first prepared by interfacial polymerization in an oil-in-water emulsion using different PVA as an emulsifier. The MCs were then uniformly dispersed in the matrix. Optical microscopy and scanning electron microscopy revealed that the size of MCs decreased as alcoholysis and polymerization degree of PVA increased. Thermogravimetric analysis showed that the MCs prepared with the high polymerization or alcoholysis degree of PVA revealed outstanding thermal stability, and the initial decomposition temperature increased by approximately 100°C compared with IPDI. Furthermore, the self-healing performance of the two-component waterborne polyurethane (2K WPU) coating system containing MCs was investigated. The 2K WPU coatings with 9 wt% PVA/PU/PUA MCs exhibited excellent self-healing, mechanical properties, and corrosion resistance, and indicated a high potential for smart coating.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Chen Yuqing,Wu Xuan,Yan Taihong,Wang Wentao,Liu Junjie,Wang Hui
NTAamide(C8) exhibits high selectivity for the extraction of Pu(IV) across a wide range of nitric acid concentrations. To separate trace Pu(IV) from radioactive liquid stream generated during the PUREX process in spent nuclear fuel reprocessing, a novel silica-polymer-based adsorbent, NTAamide(C8)/SiO 2 -P, was synthesized via vacuum impregnation using NTAamide(C8) as the extractant and SiO 2 -P as the support. The adsorption performance of Pu(IV) were systematically evaluated. Batch experiments revealed that adsorption equilibrium was achieved within 2 h, with a maximum adsorption capacity of 143.2 mg/g for Pu(IV). The material demonstrated high selectivity for Pu(IV) and exhibited excellent radiation resistance and hydrolytic stability. The adsorption mechanisms were further elucidated using X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) calculations, confirming the formation of 1:1 complexes between NTAamide(C8) and the metal ions. Column experiments using actual uranium product solution from the PUREX process verified the material's performance in trace Pu(IV) removal. After column treatment, the Pu content in the uranium product solution was reduced to below 10 Bq/gU, with no significant loss of uranium. These results demonstrate that NTAamide(C8)/SiO 2 -P is a promising adsorbent for the efficient and selective separation of Pu(IV) from radioactive liquid stream under a wide range of nitric acid concentrations.
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）