ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 18
·52958-52968
·
IF 5.8
Yuan Zhengqiu,Wu Yangfeng,Zeng Jianxian,Li Xiaoyan,Zang Kairong,Zhou Hu
In this study, hydrophobic polymer composite films based on polyurethane (PU) were prepared for oil-water separation. Hydrophilic fumed silica (nano-SiO 2 ) was introduced as reinforcing filler, and silane coupling agent (KH550) was used to crosslink PU with nano-SiO 2 in situ for enhancing the nano-SiO 2 dispersion in the films. The microscopic morphology, crystalline structure, and hydrophobic properties of the films were characterized by using scanning electron microscopy, X-ray diffraction, FTIR spectroscopy, water contact angle, and water absorption tests. The results showed that the hydrophobicity of the nano-SiO 2 /PU composite films increased with the addition of nano-SiO 2 . KH550 not only significantly promoted the crosslink action between PU and nano-SiO 2 but also enhanced the dispersion of nano-SiO 2 in the composite films. Moreover, the pore structure of the prepared films was changed with the addition of nano-SiO 2 and KH550, which greatly improved the hydrophobicity. The test results for oil-water separation performance showed that the prepared composite films can efficiently separate the oil from oil-water mixtures with good repeatability.
研究领域:
材料科学
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化学工程
·
环境科学
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产品关联
DOI
PubMed
高影响因子
FERROELECTRICS
·
2018
·
IF 0.728
Yuguo Zhuo,Jun Liu,Qingshan Li
Nano-TiO2/MDI-50 based waterborne polyurethane composites were prepared with MDI-50, polypropylene glycol (PPG) and nano-TiO2 as main materials. Nano-TiO2 was modified using r-aminopropyltriethoxysilane (KH550) as modifier in order to improve the dispersion of nano-TiO2 in WPU. The composites morphologies and physical states were investigated using scanning electron microscopy (SEM), thermogravimetry analysis (TG), fourier transform infrared (FTIR) spectroscopy and UV-visible (UV-Vis) spectroscopy. Scanning electron microscopy observations revealed that modified nano-TiO2 has good dispersibility. Results from FTIR and TG suggested that the modified nano-TiO2 had been successfully introduced to the polyurethane molecular chain and the thermal decomposition temperature of nano-TiO2/MDI-50 based waterborne polyurethane composites doubled under the same thermal weight loss. Results from UV-Vis suggested that when 2% of modified nano-TiO2 was added, maximum absorbance of composites were significantly improved and was twice higher than that of pure waterborne polyurethane.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
Sugar Tech
·
2020
·Vol. 22
·期 6
·1138-1147
·
IF 1.198
Li Xin,Deng Ligao,Li Yi,Li Kai
Polylactic acid (PLA) is biodegradable and biocompatible, but some of its functional properties limit its commercial application. To improve the properties of PLA without destroying other useful characteristics, a composite film consisting of microcrystalline cellulose (MCC) and PLA was prepared. In this research, MCC was obtained from bagasse bleached pulp by hydrochloric acid hydrolysis. After being modified by a silane coupling agent (KH550), the MCC was used as reinforcement in the PLA matrix. The degradation performance of the composite film was explored using degradation experiments in which the film was buried in soil. According to the single-factor experiments, the best composite formulation was 3% KH550, 20% KH550-MCC and 15% acetyl tributyl citrate. The results showed that the interfacial compatibility of the MCC/PLA composite films was improved after MCC was modified with KH550. This research showed that the addition of MCC can enhance the degradation rate of MCC/PLA composite films.
研究领域:
材料科学
·
生物工程
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DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 6
·1-13
·
IF 2.8
Su Hao,Yang Jin
Using 3-aminopropyltriethoxysilane (KH550), γ-glycidyloxypropyltrimethoxysilane (KH560) and silica with different particle sizes as raw materials, the grafting reaction through layer-by-layer assembly strawberry-like silica particles with multi-scale effects were prepared, and their structures were characterized by infrared spectroscopy (FT-IR), hydrogen nuclear magnetic resonance (NMR), X-ray diffraction (XRD), transmission electron microscopy (TEM) and other testing methods. Then it was physically blended with laboratory-made water-based epoxy resin WEP, and the coating with superhydrophobic properties was prepared by the low surface energy modification of methyltrimethoxysilane (MTMS). Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) to characterize the blending stability and heat resistance of the coating, and to analyze its morphological characteristics with scanning electron microscopy (SEM), and to analyze its abrasion resistance by measuring the change in the surface contact angle of the coating under certain conditions, Chemical resistance. The results showed that the prepared strawberry-like silica particles reached the expected structure, and formed Pickering emulsion similar to oil-in-water after blending with WEP, which was a stable emulsion system of solid particles. At the same time, due to the introduction of strawberry-like silica particles and the low surface energy modification of MTMS, the modified WEP has superhydrophobic properties, as well as excellent abrasion resistance, corrosion resistance and self-cleaning effect.
研究领域:
材料科学
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表面化学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 10
·5825-5838
·
IF 4.682
Zhou Jichun,Xu Wei
This experiment aims to optimize the interface compatibility between the wood template and the resin through silane coupling agent KH550, so as to improve the optical and mechanical properties of transparent wood with solid wood color and texture, and provide a theoretical basis for the application of new materials in the fields of home design and manufacturing. In this study, silane coupling agent was used to directly modify the wood templates from which partial lignin was removed, and then, epoxy resin E57 matched with the refractive index of the wood templates was introduced, and samples were obtained after impregnation and curing. Then, the orthogonal experiment method was used to explore the process conditions used when the optical performance of the samples reached the optimal (the transmittance was 87.5%, and the haze was 35.39% at 800 nm wavelength): KH550 concentration 5 wt%, 20 min, 25 °C. And the order of the influence of various factors on the light transmittance of the samples was: reaction temperature > reaction time > KH550 concentration. Then, through infrared test, X-ray diffraction patterns and electron microscopy, it was concluded that KH550 made more chemical bonds between the wood template and the resin, so the overall interface compatibility of the sample became better. Therefore, the light transmittance, tensile strength and elongation at break of the samples modified by KH550 were significantly improved, and the haze was significantly reduced. In addition, transparent wood still retains part texture of solid wood, which is also the feature of this new material. Graphical abstract
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
RSC Advances
·
2025
·Vol. 15
·期 15
·11835-11844
·
IF 4.6
Yanru Chen,Ke Yang,Hanhai Dong,Hongyu Niu,Quanguo Wang,Qingli Cheng
Silicone polyurea typically exhibits inferior mechanical properties due to the microphase separation between the siloxane and polyurea segments. To address this issue, we propose a method to enhance the mechanical properties through interfacial reactions. The mechanical properties and microphase separation of silicone polyurea we synthesized were studied. And poly(isobutene-alt-maleic anhydride) (PBAM) and γ-aminopropyl triethoxysilane (KH550) which are capable of interfacial reactions were respectively introduced into polyurea and siloxane segments to reduce the degree of microphase separation and enhance the mechanical properties of silicone polyurea. The mechanism behind the improvement was elucidated through experimental results. FT-IR spectra confirmed that the maleic anhydride groups in PBAM and the amino groups in KH550 undergo rapid reactions. Additionally, it was observed that the rapid interaction of PBAM and KH550 at the interface made interfacial tension decrease fast through the pendant-drop method. Stability analysis and light microscope observations revealed that PBAM and KH550 can stabilize the two-phase interface, forming stable droplets within the mixture. Scanning electron microscopy (SEM) observations indicated a reduction in the degree of microphase separation in the silicone polyurea. Consequently, the introduction of PBAM and KH550 decreases interfacial tension and the dispersion size of the silicone phase within the carbon phase, thereby reducing the degree of microphase separation and enhancing the mechanical properties of the silicone polyurea.
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
PubMed
高影响因子
ACS Omega
·
2021
·
IF 3.512
Lei Ge,Juanjuan Yin,Dawei Yan,Wei Hong,Tifeng Jiao
Cellulose nanocrystals (CNCs) not only have environmental protection characteristics of being lightweight, degradable, green, and renewable but also have some nanocharacteristics of high strength, large specific surface area, and obvious small size effect, so they are often used as a reinforcing agent in various polymers. However, the hydrogen bonding between CNC molecules is relatively strong, and they can easily aggregate and get entangled with each other. In this work, several large-porosity composite nanofiber films, KH550-CNC/waterborne polyurethane (WPU)/poly(vinyl alcohol) (PVAL) with KH550-modified CNCs, are prepared using poly(vinyl alcohol) (PVAL) solution and electrospinning technology. A variety of characterization methods are used to discuss and analyze the nanofiber materials, and the effects of the added amount of CNCs modified with KH550, spinning voltage, curing distance, and advancing speed on the morphology and performance of composite fibers are discussed separately. The results show that when the content of KH550-CNC is 1%, the composite fiber film obtained has the most regular morphology and the best spinnability, which is convenient for the specific application of fiber materials in a later period. In addition, the porosity of the obtained composite fiber film is 62.61%. Therefore, this work provides a theoretical basis and research strategy for the preparation of higher-porosity composite films as well as the development of new textile materials.
研究领域:
材料科学
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纺织工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 27
·e54019
·
IF 3
He Gong,Kai Zhong,Fanfan Chen,Mingyuan Yi,Lihong Wan,Zhifen Wang,Jianhe Liao
To effectively screen pathogens or eliminate allergy symptoms caused by the protein in natural latex products, the strength of the natural latex film must be improved and the water-soluble protein content in the latex products must be reduced. In this article, response surface methodology was used to optimize the reaction conditions for the preparation of hydroxyapatite (HA), and the reinforcement and adsorption of water-soluble proteins on natural rubber latex (NRL) by HA modified by coupling agent KH550 were studied. Modified HA was homogenously dispersed in the NRL, and the tensile and tear strengths of the rubber film were increased by 37.45% and 40.86%, respectively. In addition, modified HA adsorbs the water-soluble protein from the latex film. Compared with pure NR film, its protein content is reduced by 50.79%. This article has a reference value for the preparation of high-performance natural latex film with low protein content.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 8
·3825-3836
·
IF 4.5
Geng Cong,Lv Jiayu,Ming Hao,Liu Shiyue,Gao Yingjun,Meng Jing,Gao Weichun,Shen Xinjun,Zhao Zhongyuan,Xi Jingjun,Chen Shengwei,Guan Yinyan,Liang Jiyan
Capacitive Deionization (CDI) is a low energy, environmentally friendly desalination technology. In this study, PTFE activated carbon electrodes were prepared based on emulsion spraying technology and applied to CDI. In this article, resistivity, contact angle, specific surface area was tested. Combined with scanning electron microscope(SEM) and cyclic voltammetry(CV), the influence of KH550 dosages (2 g, 4 g, 6 g, 8 g) and layers of spraying (1–6 layers) on electrode performance was investigated. Coupling reagent KH550 played a role to enhance the adhesion of PTFE, and bridge activated carbon to form path for electron together with PTFE. When 4 g KH550 is added, a continuous conductive path was achieved, so the electrode exhibit good conductivity, with a resistivity of 7.65 Ω/cm. As layer increasing, more active carbon, the adsorbent, were joined together by binder, PTFE and KH550. Therefore, the specific surface area and capacitance increased. When 4 layers were sprayed, the electrode obtained a better specific capacitance, 0.564 F/cm 2 , but the mass transfer resistance became higher. Electrode, prepared by 4 g KH550 and 3 layers, was used for desalination. For low-concentration brine, salt removal rate and charge efficiency were 8.849 mg/g and 46.75%, respectively. This research provides a simple route for the preparation of activated carbon electrodes for the preparation of CDI, which was easy to expand production. The prepared electrode has great application potential in brackish water desalination.
研究领域:
环境科学
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材料科学
·
化学工程
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产品关联
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2023
·Vol. 224
·期 13
·2300067
·
IF 2.5
Bin Wang,Yunfeng Wu,Xiangmei Ma,Zhehao Dong
Zinc oxide (ZnO) is widely used as an excellent UV absorbent to improve UV-shielding ability. However, its photocatalytic activity is high, and the UV absorption region and dispersibility within the polymer are poor, which limits the application. This work is based on the design of ZnO nanoparticles via the coating of hydroxyapatite (HA) and (3-aminopropyl) triethoxysilane (KH550), then it is compounded with polyvinyl chloride (PVC). X-ray diffraction (XRD), Fourier transform infrared (FTIR), thermogravimetric analysis (TGA), high-resolution transmission electron microscopy (HRTE), and UV spectrophotometer are used to analyze the microstructure and properties. The results show that the composite films have good UV-shielding abilities and help reduce the damage of PVC upon exposure or heat. Therefore, this work provides new means to make PVC composites with superior UV-shielding properties, and the tensile strength at the break of PVC film blended with ZnO@HA/KH550 is effectively improved, which is due to good compatibility between ZnO@HA/KH550 and PVC matrix.
研究领域:
材料科学
·
高分子化学
·
纳米技术
✓ 已验证
DOI
高影响因子
POLYMER COMPOSITES
·
2026
·
IF 4.9
Li Diao,Ziyuan Wang,Han Wu,Xin Hao Xu,Linying Xiong,Ya Peng
Core–shell CaCu 3 Ti 4 O 12 @Al 2 O 3 (CCTO@Al 2 O 3 ) fillers were synthesized via a hydrothermal method and subsequently functionalized with KH550 to obtain K-CCTO@Al 2 O 3 . The formation of the core–shell structure was confirmed by transmission electron microscopy (TEM), while the successful grafting of KH550 and the presence of a stable interfacial layer were further verified by FT-IR spectroscopy, X-ray diffraction (XRD), surface energy measurements, and particle size analysis. Polyimide (PI) composites were fabricated through in situ polymerization of 4,4′-(4,4′-isopropylidenediphenoxy)bis(phthalic anhydride) (BPADA) and 4,4′-oxydianiline (ODA), with various loadings of K-CCTO@Al 2 O 3 incorporated into the matrix. The dielectric, mechanical, water resistance, breakdown strength, and thermal properties of the resulting PI composite films were systematically investigated. Among all samples, the composite containing 10 wt% K-CCTO@Al 2 O 3 showed the best overall performance, showing a dielectric constant of 8.93 at 1 kHz before water absorption and 9.10 after water absorption, with dielectric loss remaining below 0.01 under both conditions. In addition, this composite exhibited a tensile strength of 117.41 MPa, a breakdown strength of 246.1 kV/mm, improved thermal stability, and excellent water resistance. The KH550 functionalization renders the filler surface energy closer to that of the PI matrix, thereby enhancing interfacial compatibility and promoting more uniform filler dispersion. Consequently, interfacial defects are effectively suppressed, facilitating more efficient charge transport and stress transfer within the composite. This study demonstrates that combining the core–shell structure with surface functionalization is an effective approach for developing high-performance dielectric polyimide composites. Highlights KH550 was applied to modify core–shell CCTO@Al 2 O 3 fillers. Dielectric composites were prepared from K-CCTO@Al 2 O 3 and polyimide. The KH550 treatment improved the dispersion of K-CCTO@Al 2 O 3 fillers in PI. K-CCTO@Al 2 O 3 improved dielectric and mechanical performance for the optimized loading.
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产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2023
·
IF 6.2
Binghao Chen,Jiahui Yang,Hexing Li,Ziming Su,Rui Chen,Chao Tang
Bio-based sustainable natural ester has a great application prospect in the field of electrical equipment insulation due to its characteristics such as environmental friendliness. In recent years, the use of nanotechnology to improve the electrical and physical and chemical properties of liquid dielectrics has come under the spotlight. Therefore, two bio-based sustainable natural ester insulating oils were prepared in this paper, modified by nano-TiO 2 and KH550-TiO 2 , respectively. The basic physicochemical and electrical properties of two kinds of nano-TiO 2 modified insulating oils were tested and compared. And the interfacial interaction between KH550-TiO 2 and oil molecules was explored by molecular dynamics. The results showed that the improving effect of KH550 surface modified nano-TiO 2 on the electrical properties of insulating oil was superior to that of nano-TiO 2 , and the optimal concentration was 0.03 g/L. Compared with pure insulating oil, when the concentration of KH550-TiO 2 is 0.03 g/L, the breakdown voltage of nano-modified insulating oil was 75.7 kV, increased by 37.9 %, and the dielectric loss factor was 1.03 %, decreased by 59.8 %. DFT calculations show that there are a large number of electron traps at the interface of nano-TiO 2 . Electron traps can capture free electrons , reduce carrier mobility , and thus improve the breakdown voltage of insulating oil. The band gap width of KH550-TiO 2 is 4.15 eV, which is much larger than that of TiO 2 . The wider the band gap, the harder it is for electrons to transition from the valence band to the conduction band , which explains why the breakdown voltage of KH550-TiO 2 modified oil is higher than that of TiO 2 modified oil. More importantly, the amino and silicon hydroxyl groups on the surface of KH550-TiO 2 carry strong positive electrostatic potential , and can adsorb free electrons and polar molecules in insulating oil. Moreover, the interface adsorption energy between KH550-TiO 2 and oil molecular is -806.03 kJ/mol, which greatly improves the dispersion of KH550-TiO 2 in natural esters.
研究领域:
电气工程
·
纳米材料
·
电介质
·
可持续能源
·
分子模拟
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）