PROGRESS IN ORGANIC COATINGS
·
2014
·
IF 2.302
Feigao Xu,Ning Xiang,Dan Li,Jiangang Yu,Daishe Wu,Qingjian Zhang
Deterioration of monuments constructed of limestone could be potentially arrested by applying a combination of coupling agents with consolidants, which can prevent acid attack and mechanical weakening. Two different coupling agents including N-(2-aminoethyl)-3-aminopropyl methyl dimethoxysilane (AE-APMDMS) and diethyl phosphatoethyl triethoxysilane(DEPETES) were used to link calcite . Calcite was impregnated with these coupling agents and studied by FTIR, TG-DSC and contact angle measurement. According to these techniques, new bands, a two stage decomposition pattern appeared and a slight increase in surface hydrophobicity for AE-APMDMS and DEPETES that indicated interactions between the coupling agents and calcite . The Scotch Tape test and compressive strength test showed that the cohesion between consolidant and limestone powder improved, while the ability of consolidation decreased, which were resulted by coupling agents. Resist acid test on limestone powder coated with the coupling agents resulted in a decreased deterioration rate. Limestone treated with combined consolidant plus AE-APMDMS or DEPETES showed a significant decrease in capillarity water absorption.
研究领域:
材料科学
·
文物保护
✓ 已验证
DOI
高影响因子
Journal of Manufacturing Processes
·
2021
·
IF 5.01
He Li,Yongsheng Liu,Yansong Liu,Qingfeng Zeng,Jingjing Liang
Stereolithography based-3D printing technology requires ceramic slurries with high solid content and low viscosity to prevent the formation of cracks, holes, warping, and other defects in sintered ceramic parts. In this study, several approaches based on optimization of alumina powder and coupling agent were explored to improve the solid content of ceramic slurries. It was shown that slurries containing γ-Al 2 O 3 reached solid content of only 22.5 wt% and viscosity of 15,199 mPa·s. By comparison, slurries composed of α-Al 2 O 3 reached higher solid content of 75 wt% and viscosity of 12,780 mPa·s. Three types of coupling agents, namely (3-Aminopropyl) triethoxysilane, (Aminoethylamino) propyldimethoxymethylsilane and 3-(Trimethoxysilyl) propyl methacrylate (abbreviated as E, F and G, respectively) were used to reduce the viscosity of the slurries. The addition of 10 wt% G led to slurry solid content reaching 82 wt% and viscosity of 860 m·Pas. The significant decrease in viscosity was mainly attributed to the presence of bifunctional hydrolyzable groups in G, which could well attach to alumina. On the other hand, the presence of organo-functional groups might also well attach to the photosensitive resin. The ceramics prepared with γ-Al 2 O 3 exhibited numerous pores in both intraparticle and intergranular while those obtained with α-Al 2 O 3 showed pores in only intergranular. The porous structure in γ-Al 2 O 3 occupied large space, leading to low solid content. Ceramics prepared with 75 wt% solid content possessed flexural strength of 29.3 MPa, bulk density of 2.3 g/cm 3 and open porosity of 39.8 %. By comparison, ceramics prepared with 82 % solid content showed flexural strength of 45.0 MPa. In sum, these findings look promising for future preparation of high-solid content 3D printed ceramic slurries for complex ceramics, such as ceramic cores.
研究领域:
材料科学
·
3D打印技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Electronic Materials
·
2025
·
IF 5.3
Xiaoru Dong,Zhi Yang,Chaoran Xu,Jun Zhao,Juntong Zhu,Haokun Yi,Hui Xu,Zhuo Li
The couplant layer that transmits sound waves to the skin is essential for ultrasound imaging. Conventional liquid-based couplants are unsuitable for wearable detectors, while polymer-based dry couplants often suffer from high acoustic attenuation. Hydrogel-based couplants possess ideal acoustic and mechanical properties; however, water evaporation restricts their application in long-term monitoring. Current strategies to improve water retention, such as encapsulating hydrogels with elastomers, typically overlook the issue of curing shrinkage. This shrinkage induces a wrinkled interface between the elastomer and hydrogel, which can cause scattering and reflection of acoustic waves, thereby compromising ultrasound quality. To address this problem, a prefabricated hydrogel is employed as a template to mitigate the curing shrinkage at the interface. In the meantime, a large amount of glycerol is added to the template to form the organohydrogel, which reduces interactions between polymer chains, further minimizing curing shrinkage and resulting in a smooth interface. Additionally, the glycerol within the organohydrogel, combined with the external encapsulation layer, enhances long-term water retention. The results demonstrate that the prepared couplants maintain stable attenuation coefficients and produce clear imaging over 8 days.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 28
·6806-6815
·
IF 5.066
Xufeng Dong,Chenguang Niu,Min Qi
As a composite, the particle/matrix interface may play an important role in the electrorheological (ER) performance of ER elastomers, which has been overlooked in previous studies. In this study, TiO2 particles and silicon rubber were used to prepare ER elastomers. To improve the interfacial bond strength, two coupling agents, 3-(trimethoxysilyl)propyl methacrylate (A174) and triethoxyvinylsilane (VTEO), were used to modify the surface of the TiO2 particles. Particle characterization results illustrate that the coupling agent modified TiO2 particles present little change in morphology but an increase in size with respect to the bare TiO2 particles. Compared with the bare TiO2 particle filled sample, the modified TiO2 particle filled elastomers present bridging structures between the particles and the matrix, enhanced mechanical properties, and a higher dielectric constant, indicating enhanced interfacial bond strength. The viscoelastic properties of the bare and the modified TiO2 particle filled elastomers were tested and compared. The results indicated that the ER performance, including the field-induced storage modulus and the storage modulus sensitivity, can be promoted by improving the bond strength between the TiO2 particles and the silicon rubber.
研究领域:
材料科学
·
复合材料
·
界面工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Qingguang Bao,Nan Li,Bing Wang,Zhenguo Song,Bin Luo,Shan Cheng,Jingyao Feng,Mengting Li,Wenzhi Li,Yousi Chen,Xigao Jian
High-speed and heavy-duty equipment transmission or rotation systems have experienced a significant increase in demand for wear-resistant, self-lubricating resin matrix composites. However, the interfacial interaction between the fillers and the matrix is nonetheless weak due to the fact that the composites are multi-component systems. This weak interaction negatively impacts wear resistance in practical applications. In this paper, a one-step modification method of multiple fillers based on coupling agent compounding by RSM design is proposed. The resulting PPESK composites exhibit excellent thermal (T 5wt% = 517.6 °C), mechanical (Rockwell hardness = 118 HRR), and wear (ω = 0.72 × 10 −15 m 3 /Nm) properties. In addition, PPESK composite bearings were prepared, which showed lightweight advantages, exhibited outstanding tribology performance (μ = 0.079, ω = 0.52 × 10 −15 m 3 /Nm), and demonstrated excellent media resistance (Swelling degree (90 days, 25 ℃) = 0.45 %) in Jet fuel No.3. Therefore, these bearings have great application prospects in the field of aero-engine bearings.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Xiaoyu Li,Chao Lei,Junyu Wan,Weixing Xu,Jianfei Zhou,Bi Shi
Leather shavings are generated as solid waste in the leather industry and may cause environmental pollution if not disposed judiciously. These solid wastes, primarily composed of collagen fibers (CFs), can be recycled as biomass composites. However, CFs are incompatible with natural rubber (NR) due to its hydrophilicity. Conventionally, the compatibility has been improved by utilizing silane coupling agents (SCAs) along with a large number of organic solvents, which further contribute to environmental pollution. In this study, we developed a novel complex coupling agent (CCA) to enhance the compatibility between CF and NR. The CCA was synthesized through a coordination reaction between Cr(III) and α-methacrylic acid (MAA). Cr(III) in the coupling agent coordinates with the active groups in CFs, while the unsaturated double bonds in MAA facilitate covalent crosslinking between the CCA and NR, improving compatibility. The coordination bonding between CF and NR exhibits strong interfacial interaction, endowing the composites with desirable mechanical properties. Moreover, the proposed method is an economical and green approach that can be used to synthesize CF-based composites without requiring organic solvents. Herein, a strategy promoted sustainable development in the leather industry has been established.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 34
·e54327
·
IF 3
Wei Zhang,Hui Li,Weihong Cao,Zhenghong Guo,Zhengping Fang,Juan Li,Peng Chen
In this work, an organophosphorus flame retardant (BHD) was synthesized using 4-formylphenylboronic acid and 1,6-hexanediamine; a charring-coupling agent containing epoxy (DE) was synthesized using daidzein and epichlorohydrin. The BHD and DE were reacted and coated on the surface of aluminum diethylphosphinate (ADP) and the product is identified as BD-ADP. PA6 with 12 wt% BD-ADP achieves a UL-94 V-0 rating and a limiting oxygen index (LOI) value of 30.0 vol%. Substitute 1.0 wt% DE for BD-ADP, PA6-1.0E not only achieves a UL-94 V-0 rating, but also goes out before dripping. The time to ignition of PA6-1.0E is 19 s longer than that of PA6. The flame-retardant mode is the combination of the gas-phase effect of ADP and the condensed-phase effect of DE. In addition, the tensile strength and impact strength of PA6-1.0E are 103.9 MPa and 6.6 kJ/m 2 which are 35.6% and 43.5% more than that of PA6-12A. Both BD coating and DE contribute to a strong interfacial adhesion between ADP and PA6 which improves the mechanical properties. The DE plays a key role in the flame retardancy and mechanical properties of PA6 blends.
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 ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Dianbing Zhou,Yuanyuan Wang,Yingjie Ren,Liang He,Minmin Mao,Lei Cao,Bing Liu,Yasemin Tabak,Atilla Evcin,Dawei Wang,Xiaogang Yao,Kaixin Song
Polymer-ceramic composite substrates have been widely focused and used in recent years due to the 5th generation high frequency and high-speed communication. C 9 H 14 O 3 Si (Z6124) modified Mg 1.99 Ga 0.01 Si 0.99 Al 0.01 O 4 (MGSA) ceramic powder filled with polytetrafluoroethylene (PTFE) composites were prepared by casting and vacuum hot-pressing methods. The surface hydrophobicity of the particles and the interfacial compatibility of the composites were improved by using Z6124 coupling agent. Compared with the pure PTFE, the 55 wt% Z6124 modified MGSA particles filled PTFE composite board showed a high dielectric constant of 3.5 and lower dielectric loss of 9 × 10 −4 @10 GHz as well as a thermal conductivity of 0.734 W/mK, which is three times order than that PTFE @0.2 W/mK. Based on the above experiments, simulations of their dielectric properties and thermal conductivity were carried out with COMSOL Multiphysics. The results show that the 65 wt% MGSA particles construct the best thermal conductivity path filled PTFE composite board, which is consistent with the experimental results. All these properties indicate that Z6124 modified MGSA particle filled PTFE composites are potential materials for microwave substrate applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Junqing Ren,Pao Yang,Zhijian Peng,Xiuli Fu
Nowadays, microwave dielectric substrate materials have been extensively investigated to meet the requirements of rapid development in modern communications. Among them, the composites of ceramic powder filled polytetrafluoroethylene (PTFE) have been a hot topic. However, the compatibility and connectivity between the surface of ceramics and PTFE molecular chains in the samples are usually low. Herein novel PTFE based composites with different contents of Al 2 Mo 3 O 12 (20–60 wt%) modified by C 14 H 19 F 13 O 3 Si (F8261) coupling agent were designed and prepared. The coupling agent F8261 has been successfully grafted to the surface of Al 2 Mo 3 O 12 powders, effectively promoting the densification and dielectric properties of the composites. As the content of the modified Al 2 Mo 3 O 12 powders increases from 20 to 60 wt%, the ε r value increases from 3.4 to 4.2, and tanδ almost remains constant at the beginning and increases with much more Al 2 Mo 3 O 12 added. The Al 2 Mo 3 O 12 -PTFE composites filled with 30 wt% Al 2 Mo 3 O 12 present the optimal dielectric properties of ε r = 3.6 and tanδ = 0.0018 with a high density of 95.6%. In addition, the electromagnetic and multiphysic simulation of a 24 GHz substrate integrated waveguide filter on the basis of the 30 wt% Al 2 Mo 3 O 12 - 70 wt% PTFE composite was carried out. It was revealed that the filter presented high stability on the electrical parameters caused by self-heating and dimension deformation due to the good microwave dielectric , thermal and mechanical properties of the substrate. These results indicate that the as-prepared 30 wt% Al 2 Mo 3 O 12 - 70 wt% PTFE composite would be a promising candidate for high-performance microwave dielectric substrates.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2023
·
IF 29.4
Xiaoyu Han,Fan Wang,Jieliang Shen,Shuyu Chen,Pengcheng Xiao,Ying Zhu,Weiwei Yi,Zhengyu Zhao,Zhengwei Cai,Wenguo Cui,Dingqun Bai
Conventional coupling agents (such as polyvinylpyrrolidone, methylcellulose, and polyurethane) are unable to efficiently transport drugs through the skin's dual barriers (the epidermal cuticle barrier and the basement membrane barrier between the epidermis and dermis) when exposed to ultrasound, hindering deep and noninvasive transdermal drug delivery. In this study, nanobubbles prepared by the double emulsification method and aminated hyaluronic acid are crosslinked with aldehyde-based hyaluronic acid by dynamic covalent bonding through the Schiff base reaction to produce an innovative ultrasound-nanobubble coupling agent. By amplifying the cavitation effect of ultrasound, drugs can be efficiently transferred through the double barrier of the skin and delivered to deep layers. In an in vitro model of isolated porcine skin, this agent achieves an effective penetration depth of 728 µm with the parameters of ultrasound set at 2 W, 650 kHz, and 50% duty cycle for 20 min. Consequently, drugs can be efficiently delivered to deeper layers noninvasively. In summary, this ultrasound nanobubble coupling agent efficiently achieves deep-layer drug delivery by amplifying the ultrasonic cavitation effect and penetrating the double barriers, heralding a new era for noninvasive drug delivery platforms and disease treatment.
研究领域:
药学
·
生物医学工程
·
药物递送系统
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Environmental Science and Technology
·
2015
·Vol. 13
·期 1
·113-124
·
IF 2.19
Wang Z.,Ye C.,Wang H.
Amino group exhibits alkaline properties. Amino functionalized imidazole-modified silicas would benefit the adsorption of phenolic compounds. Coupling agent between the silica and the imidazolium ring has an effect on adsorption performance. In this paper, two adsorbents were synthesized for the surface bonding of N -(3-aminopropyl)-imidazole onto silicas modified by 3-chloropropyltriethoxysilane and 3-mercaptopropyltrimethoxysilane, respectively. Infrared spectra, elemental analysis, thermogravimetric analysis and N 2 adsorption–desorption isotherms were used to characterize the two adsorbents, and their adsorption capacities of 2,4-dinitrophenol from aqueous solutions were investigated in detail. The experimental results indicated that amino group plays an important role in the enhancement of adsorption capacities of 2,4-dinitrophenol. The adsorbent with 3-mercaptopropyltrimethoxysilane as coupling agent exhibited lower adsorption capacity due to a weak electron–electron repulsion between the non-bonding electrons of sulfur atom and π electrons of benzene ring of 2,4-dinitrophenol. The adsorption kinetics fitted well with pseudo-second-order model. The two adsorbents could be regenerated and reused eight times at least by washing with HCl. The adsorption mechanism was also discussed.
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
ADVANCED MATERIALS
·
2025
·
IF 26.8
Jian Chen,Youlong Hua,Binjie Jin,Zhan Zhu,Mengru Zhang,Yuhua Zhang,Renan Jin,Xiao Liang,Ruijue Cao,Xinben Hu,Xingkun Man,Li Xi,Baochun Guo,Bingfeng Ju,Qian Zhao
Couplant is indispensable for ultrasound examinations. However, shape adaptability and operational feasibility, which are both crucial, cannot be provided conjointly by existing couplants due to their either liquid or solid form. Here an ideal couplant composed of fibers and dynamically cross-linked polysilicone is reported, which exhibits a unique solid-to-fluid transition upon application of stress exceeding a threshold. Together with the acoustically transparent feature, the particularity of the stress-triggered fluidity allows conformal adapting to arbitrary geometries under stress exertion and stable preserving for long-term and reliable ultrasound examination after stress release. Steeply curved geometries and pressure-sensitive tissues, which are extremely challenging for the state-of-the-art ultrasound modalities, are successfully graphed or treated. This couplant integrates the merits of liquids and solids, providing new opportunities for various ultrasound in industrial and medical fields.
研究领域:
生物医学工程
·
超声医学
·
材料科学
·
柔性电子
·
医学影像
✓ 已验证
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）