Green synthesis of the excellent magnesium oxysulfate whiskers under controlled reaction conditions

Tang, Zhilei; Zhu, Chengfeng; Fan, Faying; Qing, Binju; Shao, Fei; Lei, Fengpeng; Deng, Xiaochuan

doi:10.1016/j.matchemphys.2017.04.014

Cited by 12 publications

(7 citation statements)

References 29 publications

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“…All the diffraction peaks could be indexed to the orthorhombic structure of 5Mg(OH)2•MgSO4•7H2O when the time exceeded 6 h. Additionally, no peaks corresponding to other impurities, such as magnesium hydroxide, were observed in the XRD pattern. This indicates that the formation mechanism in this study was different from that of the hydrothermal preparation of the 512-type and 513type BMSWs, wherein the dissolution and regeneration of magnesium hydroxide are not required, and the structure directly self-assembles to form 517-type BMSWs [34]. Chemical equations:…”

Section: Effects Of Reaction Time On Preparation Of 517-type Bmswmentioning

confidence: 94%

Preparation and Characterization of Novel 5Mg(OH)2·MgSO4·7H2O Whiskers

Ning

Hongdu

2022

Materials

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Herein, novel monodisperse basic magnesium sulfate whiskers (5Mg(OH)2·MgSO4·7H2O) were prepared under low-temperature and atmospheric-pressure conditions, using the admixture sodium citrate. X-ray diffraction, Raman spectroscopy, scanning electron microscopy, energy-dispersive spectroscopy, transmission electron microscopy, selected area electron diffraction, thermogravimetric analysis, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy were used to characterize the structure and morphology of the whisker products. The analysis results showed that the product was composed of high-purity basic magnesium sulfate whiskers. The lengths and diameters of the whiskers were 10–20 μm and 0.1–0.2 μm, respectively, and their aspect ratios were higher than 30. The formation mechanism of 5Mg(OH)2·MgSO4·7H2O involved direct assembly from the precursors without the formation of magnesium hydroxide for redissolution. High-purity MgO whiskers with smooth surfaces were prepared using the as-prepared whisker products via thermal decomposition. Thus, the findings of this study can provide technical support for the cost-effective industrial-scale preparation of basic magnesium-sulfate whiskers and associated whisker products.

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Section: Effects Of Reaction Time On Preparation Of 517-type Bmswmentioning

confidence: 94%

Preparation and Characterization of Novel 5Mg(OH)2·MgSO4·7H2O Whiskers

Ning

Hongdu

2022

Materials

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“…Composite materials are typically filled with black carbon, silica, graphite, and silicate to improve their mechanical properties and thermal resistance. Magnesium sulfate whisker (5 Mg(OH) 2 ·MgSO 4 ·3H 2 O) is an environmental‐friendly and economically attractive filler 12,13 . Recently, it has been widely used to reinforce rubbers and plastics because of its high tensile strength, modulus, and large aspect ratio (50–250) compared with other reinforcement fillers such as glass fiber and carbon fiber to prepare polymer composites, especially in the automobile industry 14 …”

Section: Introductionmentioning

confidence: 99%

“…Magnesium sulfate whisker (5 Mg(OH) 2 ÁMg-SO 4 Á3H 2 O) is an environmental-friendly and economically attractive filler. 12,13 Recently, it has been widely used to reinforce rubbers and plastics because of its high tensile strength, modulus, and large aspect ratio (50-250) compared with other reinforcement fillers such as glass fiber and carbon fiber to prepare polymer composites, especially in the automobile industry. 14 In a recent study, an attempt was made to prepare composites of silicone rubber, EVM rubber, and magnesium sulfate whisker by melt blending.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties, thermal stability, and thermal degradation kinetics of silicone rubber/ethylene‐vinyl acetate copolymer/magnesium sulfate whisker composites compatibilized by ethylene‐acrylic acid copolymer

Zia-Ul-Haq

Haq

et al. 2022

J of Applied Polymer Sci

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Silicone rubber/ethylene‐vinyl acetate copolymer/magnesium sulfate whisker composites containing ethylene‐acrylic acid copolymer (MS/SR/EVM/EAA) as a compatibilizer were successfully prepared. Moreover, the magnesium sulfate whisker surface was modified with 3 wt% of silane coupling agent (KH570), resulting in composites including (unmodified magnesium sulfate whisker) uMS/SR/EVM, (modified magnesium sulfate whisker) mMS/SR/EVM, and mMS/SR/EVM/EAA were compared. The values of thermal decomposition activation energy (Ea) calculated by the two different methods (Kissinger and Friedman methods) show that the composites filled with 5 and 20 phr whiskers have lower values of activation energy (Ea) than the SR/EVM blend. The tensile strength of composites with a 5 phr modified whisker is 14.5 MPa, which is higher than that of the SR/EVM blend and uMS5/SR/EVM composite. The tear strength of the composite with 20 phr mMS is 51.6 kN m−1, much higher than that of the composite with 20 phr uMS and SR/EVM blend. The mechanical properties were also investigated after thermal aging of the composites at 85°C for 48 h. The thermal conductivity of the composites with high filler loading was studied.

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“…In addition, MOS whiskers have been found to degrade endothermic ally, together with water vapor release, leaving fire‐resistant MgO. During endothermic degradation of MOS whiskers, heat is withdrawn from the substrate, the fuel supply is diluted by the released water vapor, and a layer of MgO insulation is formed outside the substrate . This process indicates that MOS whiskers possess the essential qualities of an additive‐type fire retardant.…”

Section: Introductionmentioning

confidence: 99%

Surface treatment of magnesium oxysulfate whiskers through plasma polymerization

Lan

Zhu

Dang

et al. 2019

Surface & Interface Analysis

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The surface of magnesium oxysulfate (MOS) whiskers was treated through plasma polymerization to increase the compatibility between the MOS whiskers and a polymer matrix. Different plasma parameters were chosen to determine the most hydrophobic coating. The surface structure of the plasma‐treated MOS whiskers was examined. The MOS whiskers retained their crystal structure after plasma treatment, as shown by X‐ray powder diffraction (XRD) analyses. X‐ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FT‐IR) spectroscopy analyses revealed that a polymer sheath was formed on the surface of the MOS whiskers, and interfacial chemical bonds were generated between the polymer sheath and the MOS whiskers. The thin‐layer polymer sheath was uniform around the entire surface of the MOS whiskers and exhibited a typical amorphous structure, as determined by transmission electron microscopy (TEM) combined with selected area electron diffraction (SAED) analyses. The possible reaction mechanism on the surface of the MOS whiskers under plasma treatment was then proposed. Finally, the effect of surface treatment was evaluated by scanning electron microscopy (SEM), measurement of the contact angle and contact angle hysteresis, and torque rheometer. Results showed that plasma treatment could markedly increase the hydrophobicity of the MOS whiskers' surface, effectively reducing the agglomeration and improving the dispersibility of the MOS whiskers in the matrix, which results in the improved compatibility between the MOS whiskers and the polyvinyl matrix, as well as the processability of the composites.

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Green synthesis of the excellent magnesium oxysulfate whiskers under controlled reaction conditions

Cited by 12 publications

References 29 publications

Preparation and Characterization of Novel 5Mg(OH)2·MgSO4·7H2O Whiskers

Preparation and Characterization of Novel 5Mg(OH)2·MgSO4·7H2O Whiskers

Mechanical properties, thermal stability, and thermal degradation kinetics of silicone rubber/ethylene‐vinyl acetate copolymer/magnesium sulfate whisker composites compatibilized by ethylene‐acrylic acid copolymer

Surface treatment of magnesium oxysulfate whiskers through plasma polymerization

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