INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Ziyu Ba,Hongyun Luo,Jie Cui,Zhaoliang Guo
Fast-growing bamboo composites with the delignification and densification fabricating processes have been widely applied for sustainable structural materials, but the environmentally stability still hinders its further development. Here, we demonstrate a robust and environmental stable modified densified bamboo composites consisting of hierarchical Al 2 O 3 nanoparticles and organic coupling agent γ-Aminopropyl triethoxysilane (KH550) layer. KH550 densified bamboo exhibits superb tensile strength and flexural strength of 462 MPa and 364 MPa, which are, respectively, 237% and 198% higher than those of natural bamboo. Flexible molecular chains of KH550 decorate cellulose with silane groups and amino groups, the thermal decomposition temperature significantly delays ∼80 ℃ and hydrophilic densified bamboo turns hydrophobic with the contact angle of ∼112°. The obtained Al 2 O 3 densified bamboo however shows rough and porous defects, and only exhibits slight increase in tensile properties , but decreases on flexural and thermal properties. Real-time acoustic emission also reveals that the introduction of coupling agent enhances the load delivery between fibers and parenchyma cells, leading to high energy consumption and fracture resistance. This work shows the complex effects of organic and inorganic modification designs for bamboo materials, which might arouse potential application prospects for environmentally stable, sustainable robust structural biomass composites.
研究领域:
材料科学
·
生物质工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Qi Bu,Shuang Yin,Wei Wan,Sisi Zeng,Shiyao Zhou,Lei Yu,Yuejun Ouyang
Flexible CaCu 3 Ti 4 O 12 (CCTO)/polyurethane dielectric composite films were fabricated, and the effects of the silane coupling agent, 3-Aminopropyltriethoxysilane (KH550), on the dielectric properties of the composite films were investigated. It was found that using KH550 significantly improved interfacial compatibility between the CCTO filler and the polyurethane matrix, leading to the reduction of dielectric loss and conductivity, and an increase in the dielectric breakdown strength . At 100 Hz, the composite film with a 3 wt% KH550 dosage exhibited a dielectric constant of 53.1 and a dielectric loss of only 0.068 (a 73.8 % reduction compared to the composite film with untreated CCTO particles). The composite films with KH550-modified CCTO particles exhibited a maximum breakdown strength of 18.5 kV/mm, showing a 58.1 % increase compared to the composite film with untreated CCTO particles. Moreover, introducing KH550 was beneficial in reducing the variation of dielectric properties with temperature, thereby enhancing the reliability of polyurethane based dielectric composite materials in practical applications.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
·
2025
·
IF 3.1
Zuhao Wang,Xiao Peng,Ioannis Chronis,Yingrui Wu,Constantinos S. Psomopoulos,Chao Tang
As the global power industry evolves, transformer insulation systems face increasing challenges. The aging of cellulose insulation paper (cellulose-IP) at elevated temperatures significantly impacts its insulation properties and overall lifespan. To enhance the thermal aging resistance and industrial usability of cellulose-IP, this study employs nano-boron nitride (h-BN) along with three silane coupling agents—3-ammonopropyltriethoxysilane (KH550), 3-glycidyloxypropyltrimethoxysilane (KH560), and 3-methacryloyloxypropyltrimethoxysilane (KH570)—to modified cellulose-IP. Upon evaluating the properties and simulation results of the modified cellulose-IP, KH550-hBN demonstrated superior properties and was selected for an accelerated thermal aging test lasting 60 days. The results indicated that KH550-hBN effectively mitigates the degradation of cellulose-IP. In the late aging stage, the mechanical properties of the modified cellulose-IP deteriorated more slowly than those of pure cellulose-IP. Additionally, thermal conductivity improved by 26.9%, while breakdown field strength increased by 12.1%. The introduction of KH550-hBN promotes the formation of a complete thermal conductivity network within the cellulose matrix, increases the number of intermolecular hydrogen bonds and introduces nano-barrier regions.These improvements enhance the interactions between the cellulose systems and effectively inhibit the generation and migration of polar derivatives during the aging process, resulting in a significant improvement in the longevity and stability of transformer internal insulation systems.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 7
·8890-8902
·
IF 2.478
Liu Yulong,Chen Yufei,Zhao Hui,Teng Chengjun
Graphene oxide (GO) was obtained by improved Hummers method; the pseudoboehmite (AlOOH) nanoparticles were prepared with aluminum isopropoxide by Sol–Gel method and modified by the silane coupling agent (KH-550) to get KH550-AlOOH. GO was coated by KH550-AlOOH to gain KH550-AlOOH@GO component. In the meantime, the matrix (E51-BCE) was synthesized from epoxy resin (E51) and bisphenol A cyanate (BCE). KH550-AlOOH@GO/E51-BCE composites were prepared via in situ polymerization, E51-BCE as the matrix and KH550-AlOOH@GO as the reinforcement. The micro-morphology of KH550-AlOOH@GO was investigated by Fourier transform infrared spectrometer (FT-IR) and transmission electron microscope (TEM), and the results showed that KH550-AlOOH was well distributed on the GO sheet and with abundant hydroxyl groups on its surface. The X-ray diffraction (XRD) and scanning electron microscope (SEM) of KH550-AlOOH@GO/E51-BCE composites indicated that KH550-AlOOH@GO was uniformly dispersed in E51-BCE matrix and there was a good interaction between them, which was conducive to the performances of the composite material. Mechanical and dielectric properties of composite also were tested and analyzed. The highest bending strength, bending modulus, and impact strength of KH550-AlOOH@GO/E51-BCE composites were 158.23 MPa, 2.37 GPa, and 46.96 kJ/m 2 , respectively, when the content of KH550-AlOOH@GO was 0.6 wt%, which were 15.72%, 22.42%, and 198.22% higher than those of the matrix resin, respectively. The dielectric constant and dielectric loss of the composite were 3.12 and 0.0027 at 100 Hz.
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
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 142
·期 3
·e56377
·
IF 2.7
Yaqi Ge,Pengfei Diao,Xiangxu Li,Yukun Zhou,Zhenchun Xu,Huiguang Bian,Yao Xiao,Chuansheng Wang
In this paper, pyrolysis carbon black (CBp) was introduced into nitrile butadiene rubber (NBR), the effects of the ratio of CBp and carbon black (N326) on the properties of NBR composites were investigated, and the optimal ratio was determined. On this basis, the accelerator DPG, coupling agent KH550 and CBp were modified by ball milling and plasma. The results showed that when the ratio of CBp to N326 was 40:15, the overall properties of NBR composites was better. Compared with the unmodified CBp/NBR composites, the change rate of tensile product, resilience and DIN abrasion of ball milling-plasma modified CBp/NBR composites in oil environment were reduced by 52.96%, 12.81%, and 27.19%, respectively, and the tear strength after double damage by high temperature and oil bath was increased by 15.63%, which resulted in better oil and high temperature-resistance. In summary, the ball milling-plasma combined with DPG/KH550 modified CBp can not only replace N326 carbon black, but also realize the preparation of NBR composites with better oil and high temperature-resistance.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2015
·
IF 2.587
Jian-Chao Liu,Miao-Jun Xu,Tao Lai,Bin Li
Ammonium polyphosphate (APP), which is an important component of intumescent flame retardant (IFR), has been modified with (3-aminopropyl) triethoxysilane (KH550) and silicon resin to enhance its hydrophobic properties. The structure and properties of the modified ammonium polyphosphate (MAPP) were well-characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy (SEM), and water contact angle (CA). The water CA of MAPP was as high as 148°, which demonstrated that MAPP possessed excellent hydrophobic properties. MAPP and APP were mixed with triazine, which is a char-foaming agent (CFA), and polypropylene (PP) to prepare PP/MAPP/CFA and PP/APP/CFA composites, respectively. The fire retardancy and thermal degradation behavior of PP/MAPP/CFA and PP/APP/CFA composites were investigated by limiting oxygen index (LOI), vertical burning test (UL-94), cone calorimetry, and thermogravimetric analysis. The surface and fracture morphologies were evaluated by SEM. The mechanical properties was analyzed by tensile, flexural, and izod impact tests. The results demonstrated that the MAPP imparted excellent flame retardancy of PP/MAPP/CFA systems, along with a higher LOI value, UL-94 rating, and lower heat release rate and total heat released values. The modification enhanced the interfacial adhesion, mechanical stability, and thermal stability of PP/MAPP/CFA composites. Moreover, PP/MAPP/CFA composites with the thickness of 1.6 mm can still pass the UL-94 V-0 rating after treatment with water for 168 h at 70 °C, meanwhile the weight loss rate was decreased from 2.31% for PP/APP/CFA composites to 0.85%, indicating excellent water resistance. This investigation shows a promising formulation for water-resistant intumescent flame-retardant PP composites with extraordinary properties.
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
ACS Applied Nano Materials
·
2024
·
IF 5.3
Yingrui Wu,Junyan Zhang,Binghao Chen,Hexing Li,Chao Tang
Nanoparticles are presently considered to be high-potential additives in insulation materials. Surface modifiers can not only improve the compatibility between nanoparticles and natural ester but also enhance the insulation performance of the insulation liquid. In this work, a mixture of two natural ester insulation oils (rapeseed oil + palm fatty acid ester) doped with 3-aminopropyltriethoxysilane (KH550)-TiO2 nanoparticles was prepared, and a 56-day thermal aging experiment was implemented. Moreover, the molecular dynamics simulation was applied to investigate the improvement mechanism of the physicochemical and electrical properties from a microscopic perspective. The experimental results revealed that KH550-modified nano-TiO2 particles could reduce the generation of microwater and acidic substances during the aging process of the oil–paper insulation system, retard the degradation of the system, and improve the thermal stability and insulation performance. At the end of the thermal aging, a decrease of breakdown voltage by 7.3% and an increase of acid value by 17.3% were observed in the modified insulation oil. On the contrary, the pure insulation oil decreased the breakdown voltage by 26.96%, and the acid value increased by 28.38%. Furthermore, the molecular simulation results determined that KH550-TiO2 could combine with polar molecules through hydrogen bonds, adsorb polar molecules in insulation oil, prevent their diffusion into cellulose insulation paper, and delay the aging and decomposition of insulation paper. Therefore, the modified nanoparticles have remarkably enhanced the antithermal aging performance of the oil–paper insulation system, which provides a considerably greater application prospect for nanomodification insulation in liquid medium.
研究领域:
材料科学
·
电气工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2022
·
IF 7.693
Xiaotao Zhang,Shun Zhou,Han Zhou,Dongxu Li
In this study, the effect of the incorporation of GO and KH550 modified GO(MGO) on the microstructure, mechanical properties and hydration process of the cement-based composites has been discussed. It is observed that the MGO surface is grafted with the functional groups, which reduce the interlayer force, thus, the dispersibility in the cement paste is improved. In addition, compared with GO, the addition of MGO can further promote the hydration of cement, and optimize the content of the various hydration products owing to no impact on the types of the hydration products, thus, make the microstructure of the cement more uniform. At the same time, the incorporation of MGO can refine the CH crystal size, reduce the total porosity of the cement material, and promote the conversion of harmful pores to harmless pores, thus, making the cement-based materials more compact and effectively improving the mechanical properties.
研究领域:
材料科学
·
土木工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Hailan Han,Hai Qiang Li,Meiyu Liu,Lishuang Xu,Jingmei Xu,Shuang Wang,Hongzhe Ni,Zhe Wang
A series of novel organic-inorganic crosslinked hybrid proton exchange membranes were prepared using sulfonated poly(arylene ether ketone sulfone) polymers containing carboxyl groups (C-SPAEKS), (3-aminopropyl)-triethoxysilane (KH550), and tetraethoxysilane (TEOS). KH550 acted as a “bridge” after reacting with carboxyl and sulfonic groups of C-SPAEKS to form covalent and ionic crosslinked structure between the C-SPAEKS and SiO 2 phase. The crosslinked hybrid membranes (C-SPAEKS/K-SiO 2 ) were characterized by FT-IR spectroscopy, TGA , and electrochemistry , etc. The thermal stability, mechanical properties and proton conductivity of the crosslinked hybrid membranes were improved by the presence of both crosslinked structure and inorganic phase. The proton conductivity of C-SPAEKS/K-SiO 2 -8 was recorded as 0.110 S cm − 1 , higher than that of Nafion ® (0.028 S cm − 1 ) at 120 °C. Moreover, the methanol permeability of the C-SPAEKS/K-SiO 2 -8 was measured as 3.86 × 10 −7 cm 2 s − 1 , much lower than that of Nafion ® 117 membranes (29.4 × 10 −7 cm 2 s − 1 ) at 25 °C.
研究领域:
材料科学
·
化学工程
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2025
·
IF 5.1
Chenyu Cai,Shuangshuang Liang,Tianxiang Li,Luyao Cong,An Fan,Hong Hao
Intelligently responsive super-wetting coatings have garnered significant attention for their ability to modulate wettability in response to environmental stimuli, enabling efficient oil/water separation. This study presents a novel pH-responsive super-wetting coating fabricated via a simple, cost-effective sol-gel and dip-coating approach on cotton fabric. The coating combines low-surface-energy dodecyl trimethoxysilane (DTMS) with pH-sensitive 3-aminopropyl triethoxysilane (KH550) modified SiO 2 nanoparticles. The coating's structure, morphology, and properties were characterized using Fourier transform infrared (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), and water contact angle measurements (WCA). Compared to existing pH-responsive systems, this coating exhibits superior switching speed: it transitions rapidly from superhydrophobicity (WCA > 150° at pH 7) to superhydrophilicity (WCA decreases from 50.24° to 0° within 20 s at pH 1) and reversibly back to superhydrophobicity (WCA = 163° at pH 13). The coating demonstrates excellent stability in various salt solutions (NaCl, KCl, KNO 3 ) and under ultrasonic washing, ensuring robustness in complex aqueous environments. Leveraging this reversible wettability switching, the coating achieves high separation efficiencies for both high-density (98.5 %) and low-density (96 %) oil/water mixtures. Critically, this fabrication strategy eliminates the need for expensive, environmentally hazardous heavy metals (e.g., Ag, Au, Cu) or complex polymerization processes commonly employed in other smart separation materials. The combination of rapid switching, environmental and economic friendliness, salt resistance, durability, and high separation performance underscores the significant potential of this coating for diverse practical oil/water separation applications.
研究领域:
材料科学
·
表面化学
·
环境功能材料
·
纳米技术
·
分离科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Xinyi Wan,Yingqing Zhan,Zhihang Long,Guangyong Zeng,Yang Ren,Yi He
To develop high-performance magnetic polymer composites, we reported a facial mussel-inspired way to functionalize Fe 3 O 4 microspheres with dopamine (DA) and KH550, followed by compounding with poly (arylene ether nitrile) (PEN), to prepare functional nanocomposite films. Such mussel inspired co-modification of Fe 3 O 4 was characterized and confirmed by Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Therefore, the outstanding properties of the functionalize Fe 3 O 4 /polymer composites were obtained. With the addition of 15 wt% functionalized Fe 3 O 4 , the saturation magnetization (Ms) and dielectric permittivity of the PEN composites were increased to 12.49 emu/g and 14.3 (250 Hz), respectively, while the low dielectric loss was maintained. In addition, even the high loading content of Fe 3 O 4 was incorporated, the functional PEN composites still exhibited high mechanical properties and thermal stability, including the significant improvement in glass transition temperature, and the same level of the tensile strength compared with neat PEN. Our work revealed that magnetic and dielectric PEN composites materials along with high comprehensive properties may be potentially used in the electromagnetic fields.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2025
·
IF 4.7
Yuting Qiu,Qingnan Meng,Chi Zhang,Mu Yuan,Xinyue Mao,Sifan Wang,Shiyin Huang
In this study, a wear-resistant epoxy resin (EP) composite coating incorporating surface-modified silicon carbide (SiC) particles was developed. The SiC particles were functionalized through sequential thermal oxidation and silane coupling agent (KH550) modification to yield SiC@SiO 2 -KH550 hybrid fillers. The influence of filler addition and content on the tribological properties was investigated with a pin-on-disk wear tester, whereas the wear morphology was analyzed by scanning electron microscopy (SEM). The results indicate that the neat EP coatings primarily exhibit an adhesive wear mechanism, whereas the composite coatings show a mixed wear mechanism involving adhesion, abrasion, and delamination. The composite coating with 20 wt% SiC@SiO 2 -KH550 filler achieved optimal tribological performance, with reductions in wear rate by 80% and 26% compared to neat EP and unmodified SiC/EP systems, respectively. The enhanced wear resistance is mainly attributed to the modified SiC particles, which promote the formation of transfer films with excellent mechanical properties and a larger area ratio through improved interfacial bonding and dispersion.
研究领域:
材料科学
·
表面工程
·
聚合物复合材料
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）