JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 136
·期 8
·47098
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IF 1.901
Zhuo Li,Jijun Wan,Yingzhe Li,Yang Li,Fei Zhao,Shugao Zhao
The effects of various coupling agents on the characteristics and properties of a natural rubber (NR)/styrene–butadiene rubber (SBR) matrix and its adhesion to continuous basalt fiber (CBF) cords were studied. Four types of silane-based and two types of titanate-based coupling agents were added separately to the rubber matrix during the mixing process. The processability of the rubber compounds and the mechanical and tension fatigue properties of the vulcanizates were evaluated. The static and dynamic adhesion between the CBF cord/rubber matrices were investigated using the H pull-out test and an elastomer testing system, respectively. The results showed that the effects of the coupling agent were controlled by its chemical structure, and it was found that the addition of (3-aminopropyl)triethoxysilane was the most effective for enhancing the interfacial fatigue properties, due to the combined improvements of the initial adhesion, interfacial stress states, and the fatigue property of the rubber matrix. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47098.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
Materials
·
2020
·Vol. 13
·期 21
·4896
·
IF 3.057
Yiren Pan,Meng Zhang,Jian Zhang,Xiaoyao Zhu,Huiguang Bian,Chuansheng Wang
In this paper, the areca fiber was extracted by physical and chemical treatment, and then the areca fiber/natural latex composite was prepared by natural latex impregnation technology. In order to combine areca fiber and natural rubber latex better, three silane coupling agents with different action mechanism were selected: Si−69, KH550, and KH570 which were used to treat the areca fiber/natural latex compound. The results show that the silane coupling agent can change the surface of the fiber from hydrophilic surface to organophilic surface, making the bonding of areca fiber to natural latex more closely. At the same time, the mechanical properties, physical and mechanical properties, swelling properties, and dynamic viscoelastic properties of the tightly bonded areca fiber/nature latex composites were improved. After observing the micro-structure through a scanning electron microscope, it was found that the three silane coupling agents could effectively bind areca fiber and natural latex to enhance the performance of the composite material, of which Si−69 performed best, and the tensile strength and tear strength of the composite increased by 21.19% and 12.90% respectively.Keywords:areca fiber;natural latex;silane coupling agent
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
Materials
·
2023
·Vol. 16
·期 18
·6221
·
IF 3.4
Junxue Chen,Zheng Chen,Junjiao Yang
The corrosion resistance of zinc–aluminum–magnesium steel plates (Zn–Al–Mg steel plates) is significantly higher than that of galvanized steel plates. However, the unsatisfactory bonding performance of Zn–Al–Mg steel plates significantly limits their widespread application. In this study, X-ray photoelectron spectroscopy is employed to detect changes in the surface oxygen content of Zn–Al–Mg steel plates after different temperature treatments to confirm the existence of surface loose layers. In particular, changes in the surface oxygen content of the Zn–Al–Mg steel plates after the oxide layer is removed are investigated under saturated H2O vapor and O2environmental conditions, and the cause of the formation of loose surface layers is determined. The uneven distribution of elements on the surface of the Zn–Al–Mg steel plates is investigated with scanning electron microscopy and energy dispersive spectroscopy. Nuclear magnetic resonance is employed to determine the size of the network spatial structure formed by silane coupling agents under different hydrolysis conditions and to further investigate the bonding performance of hydrolysate-modified Zn–Al–Mg steel plates. Several typical automotive adhesives are utilized to compare and examine the changes in the tensile strength of the Zn–Al–Mg steel plate bonding before and after modification with the silane coupling agent and analyze the structural damage of the adhesive at the bonding interface. The results confirm that the silane coupling agent strengthens the loose layer on the surface of the Zn–Al–Mg steel plate.Keywords:zinc–aluminum–magnesium steel plate;loose layer;silane coupling agent
研究领域:
材料科学
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表面工程
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DOI
PubMed
高影响因子
RSC Advances
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2021
·Vol. 11
·期 41
·25158-25169
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IF 3.361
Zheng Wang,Mei-chen Liu,Zhi-yuan Chang,Hui-bo Li
In this research, the graft modification mechanism of coupling agent vinyl triethoxysilane (KH-151) to macroporous silica gel was studied using a combination of multiple methods. SEM, FTIR, RAMAN, NMR and XPS were used to characterize the silica gel before and after grafting, determining the mechanism of the grafting reaction of the silane coupling agent. On this basis, the grafting rate of the coupling agent was accurately calculated by TGA weight loss. From the results of characterization, it can be seen that the coupling agent molecules have two connection types on the surface of silica gel, and the ratio of the two types is 43.51% and 56.49% respectively. The influences of hydration degree of the silica gel, coupling agent dosage and reaction temperature on the grafting rate were explored, and the optimal reaction conditions for the modification of macroporous silica gel were determined by the coupling agent through orthogonal experiments, that is, the hydration degree of silica gel of 10%, a coupling agent dosage of 12 mL, and a reaction temperature of 80 °C. Under optimal reaction conditions, the average grafting rate of the coupling agent vinyl triethoxysilane (KH-151) on macroporous silica gel is as high as 91.03%.
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
Frontiers in Materials
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2024
·
IF 2.6
Qiang Li,Mingdong Lei,Ziyou Li,Qiang Gan,Yong Sun,Xiaoxing Wei
Neat high-temperature vulcanized silicone rubber (HTV SR) showed bad hydrophobicity due to the existence of a large number of inorganic reinforcing fillers on its surface, which affected its security application in outdoor insulation systems. In this work, hydrophobic silane chains were grafted onto the surface of inorganic particles on the skin layer of HTV SR by a one-step coupling modification to improve its hydrophobicity. The effects of coupling agent types and coupling reaction conditions on the hydrophobicity of HTV SR were investigated. It was determined that the perfluorooctane trichlorosilicon with a large number of low surface energy fluorine atoms was the preferred coupling agent. The contact angle of HTV SR was increased by 15.70% when the optimal coupling reaction conditions were determined to be a reaction temperature of 60°C, a reaction time of 4 h, and an amount of coupling agent of 0.5%. The study found that both etching reaction and grafting reaction occurred during the whole coupling modification process, which led to the disappearance or decrease of a lot of holes on the HTV SR surface. After the fluorination coupling reaction, the surface of HTV SR became smooth and dense that led to the decrease of water absorption. The result of Fourier-transform infrared spectroscopy analysis showed the formation of C-F bond in HTV SR after fluorination modification, and the energetic dispersive spectroscopy analysis showed that the fluorine content on the surface of the fluorinated HTV SR increased significantly. Moreover, the stability analysis showed that the fluorinated HTV SR still had a good thermal stability and mechanical property stability.
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
CERAMICS INTERNATIONAL
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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
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电气工程
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产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
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2020
·
IF 4.419
Xiaobin Han,Zhilong Cao,Ruiyang Wang,Peng He,Yichi Zhang,Jianying Yu,Yangyang Ge
In order to evaluate the influence of silane coupling agent modified zeolite warm mix additives on the properties of asphalt, the physical and rheological properties as well as chemical structure of asphalt with zeolite, γ-ammoniapropyltriethoxysilane modified zeolite (KH550-zeolite) and γ-(2,3-epoxypropoxy)propytrimethoxysilane modified zeolite (KH560-zeolite) before and after thin film oven test (TFOT) aging were thoroughly investigated. The results showed that, compared with zeolite, KH550-zeolite and KH560-zeolite made the softening point of asphalt increase more, and whose penetration and ductility decrease less, which indicated that KH550-zeolite and KH560-zeolite (especially KH560-zeolite) could enhance the high-temperature properties and had less effect on the penetration and ductility of asphalt. The temperature susceptibility of asphalt was clearly reduced and the rutting factor (G*/sinδ) was enhanced after the introduction of silane coupling agent modified zeolites compared with zeolite. After the TFOT aging, the performance of asphalt with silane coupling agent modified zeolites (especially KH560-zeolite) had a little change. In a word, KH550-zeolite and KH560-zeolite as warm mix additives had a positive effect on the physical, rheological and anti-aging properties of asphalt.
研究领域:
材料科学
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土木工程
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产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2020
·
IF 6.444
Hua Cheng,Kai Zhao,Yi Gong,Xiao Wang,Rui Wang,Fengyu Wang,Rui Hu,Fangkuo Wang,Xian Zhang,Jianying He,Xingyou Tian
Creating covalent bonds between inorganic fillers and polymer matrix is an effective method to enhance the thermal conductivity (TC) of composite materials, while the detailed mechanism is still not clear. By introducing different silane coupling agents (SCAs) bonding poly(vinyl alcohol) (PVA) and functionalized boron nitride (fBN), intrinsic relationship between molecular structure of silane crosslinkers and TC of PVA-fBN composite has been systematically investigated. The results show that the SCAs molecules with short side chain, i.e. vinyl triethoxysilane (VTES) and tetraethyl orthosilicate (TEOS), increase the TC of composite polymer, with maximum value of 1.636 W/m·K, which is 337.3% of that of PVA/fBN. In contrast, 3-glycidoxypropyltrimethoxy silane (GPTMS) with long side chain decreases the TC to 54.4% of that of PVA-fBN. The number of hydrolyzable Si O R of SCAs molecules affects the TC of PVA-fBN composite through controlling the self-condensation degree of SCAs. Integrated with atomistic simulations, these findings provide new insights for the design of polymer-based thermal management materials.
研究领域:
材料科学
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热管理材料
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DOI
高影响因子
Micro & Nano Letters
·
2018
·Vol. 13
·期 11
·1556-1559
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IF 0.841
Lihui Yao,Yajuan Wang,Ya Li,Jingkuan Duan
Different Fe 3 O 4 particles are synthesised with silane and carboxylic acid, surface modified by co-precipitation, and subsequently are characterised by Fourier transform infrared spectroscopy, wide-angle X-ray diffraction, laser particle size analyser (LPSA) and thermogravimetric analyser (TG). Based on the LPSA results, Fe 3 O 4 particles are micrometre size due to the experimental condition and modifiers. It is therefore suggested that the vacuum freeze-drying and the long-chain modifiers tend to obtain small size particles. The modifiers density on the surface of Fe 3 O 4 particles is obtained by TG and formula calculation. It is shown that the silane coupling agent is more effective modifier for Fe 3 O 4 particles compared with carboxylic acid. In accordance with the molecular structure and functional group number of carboxylic acids, different carboxylic acids have different modifiers density.
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
CONSTRUCTION AND BUILDING MATERIALS
·
2020
·
IF 4.419
Xiaobin Han,Jianying Yu,Zhilong Cao,Ruiyang Wang,Wei Du,Peng He,Yangyang Ge
Zeolite is a common additive for warm mix asphalt. In order to improve the dispersion and water loss rate of zeolite in asphalt, it was modified by γ-ammoniapropyltriethoxysilane (KH550, namely KH550-Zeolite) and γ-(2,3-epoxypropoxy)propytrimethoxysilane (KH560, namely KH560-Zeolite). FTIR demonstrated KH550 and KH560 were grafted to the surface of zeolite through chemical reaction, and SEM showed that the agglomeration of the modified zeolites was weaker than that of zeolite. Laser particle size analyzer revealed the particle size of zeolite, KH550-Zeolite and KH560-Zeolite mainly distributed in 7–20 μm, 4–10 μm and 3–8 μm, respectively. The KH550-Zeolite and KH560-Zeolite were more compatible with n-heptane than zeolite and the water contact angles of zeolite, KH550-Zeolite and KH560-Zeolite were 0°, 36.75° and 63.5°. In hot asphalt, the water loss of zeolite was non-uniform (first fast, then slow), while that of KH550-Zeolite and KH560-Zeolite was uniform, which results in that the viscosity reduction effect of KH550-Zeolite and KH560-Zeolite on asphalt was better than that of zeolite. The residual Marshall stability, flexural breaking strain and dynamical stability of warm mix asphalt with KH550-Zeolite or KH560-Zeolite were higher than those of warm mix asphalt with zeolite. When the mixing and compaction temperature of warm mix asphalt was 30 °C lower than that of hot mix asphalt, the comprehensive road performance of warm mix asphalt with KH550-zeolite was better than that of hot mix asphalt.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 10
·5825-5838
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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
Polymers
·
2023
·Vol. 15
·期 7
·1759
·
IF 5
Yuxian Ma,Minghui Zhang,Wenhao Du,Shixiong Sun,Benbo Zhao,Yuan Cheng
Waterborne coatings have obtained more and more attention from researchers with increasing concerns in environmental protection, and have the advantages of being green, environmentally friendly and safe. However, the introduction of hydrophilic groups leads to lower hydrophobicity and it is difficult to meet the requirements of complex application environments. Herein, we proposed an optimization approach of waterborne polyurethane (WPU) with vinyl tris(β-methoxyethoxy) silane (A172), and it was found that the surface roughness, mechanical properties, thermal stability and water resistance of WPU will be increased to a certain extent with the addition of A172. Moreover, the hydrophobicity of the coating film is best when the silicon content is 10% of the acrylic monomer mass and the water contact angle reaches 100°, which could exceed two-thirds of the research results in the last decade. Therefore, our study can provide some theoretical basis for the research of hydrophobic polyurethane coatings.Keywords:silane coupling agent;waterborne polyurethane;acrylate;hydrophobic modification
研究领域:
材料科学
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高分子化学
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环境科学
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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）