Surface modification of magnesium hydroxide sulfate hydrate whiskers using a silane coupling agent by dry process

Zhu, Donghai; Nai, Xueying; Lan, Shengjie; Bian, Shaoju; Liu, Xin; Wu, Li

doi:10.1016/j.apsusc.2016.08.033

Cited by 49 publications

(14 citation statements)

References 22 publications

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“…In comparison with Figure (a), some additional absorption peaks appeared in Figure (b) for the char layer of MMH–O‐SEBS–PP. The characteristic absorption peaks at 2973 and 1053 cm −1 indicated the presence of CH and SiOSi structures . Table shows that silicon was detected in the char residue surface of the MMH–O‐SEBS–PP composites, with a relative content of 0.11%.…”

Section: Resultsmentioning

confidence: 98%

“…From the line (a) of the MH FTIR spectrum, a sharp and intense peak appeared at 3700 cm −1 ; this was attributed to the OH stretching vibrations of MH. After grafting with TES, the line (b) of GMH showed new absorption peaks at about 2250 and 1079 cm −1 ; these corresponded to the stretching vibrations of SiH and SiOSi, respectively. The peak at 2980 cm −1 was assigned to the stretching vibrations of CH generated from a small amount of unhydrolyzed methyl groups on TES.…”

Section: Resultsmentioning

confidence: 99%

“…The surface modification enhanced the compatibility of the MH and O‐SEBS–PP matrix. On the basis of the previously reported studies, the grafted amount of silane coupling agents were not sufficient to obtained reasonable compatibility and water resistance when the surface of MH was chemically modified with silane coupling agents . The durability of the modified magnesium hydroxide (MMH) was not excellent when MH was directly encapsulated by silicone rubber because of the polar differences between MH and silicone rubber .…”

Section: Introductionmentioning

confidence: 99%

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Surface modification of magnesium hydroxide and its application in flame‐retardant oil‐extended styrene–ethylene–butadiene–styrene/polypropylene composites

Liu

et al. 2018

J of Applied Polymer Sci

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Magnesium hydroxide (MH) was modified with triethoxysilane and polymethyl-vinyl silicone rubber and used to prepare flame-retardant oil-extended styrene-ethylene-butadiene-styrene (O-SEBS)-polypropylene (PP) composites. The water contact angle of modified magnesium hydroxide (MMH) reached 141 ; this indicated that MMH possessed excellent hydrophobic properties. The samples (1.6 mm) passed the UL-94 V-0 rating during vertical burning tests when the loading amount of MH or MMH was 70 wt %. This indicated the modification did not decrease the flame-retardant properties of MH. The tensile strength and elongation at break values of the MMH-O-SEBS-PP composites increased by 20.4 and 88.9%, respectively, compared with those of the MH-O-SEBS-PP composites. The modification of MH enhanced the interfacial compatibility between the flame retardant and the matrix; thus, the mechanical performance was enhanced. Moreover, MMH was scarcely extracted after water treatment for 168 h at 70 C. As a result, the mechanical properties and flame retardancy of the MMH-O-SEBS-PP composites were well maintained after the water treatment. The modification of the MH endowed the O-SEBS-PP composites with an excellent compatibility and water-resistant performance.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Surface modification of magnesium hydroxide and its application in flame‐retardant oil‐extended styrene–ethylene–butadiene–styrene/polypropylene composites

Liu

et al. 2018

J of Applied Polymer Sci

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“…To modify the surface property of MHSH whiskers, Agnieszka Pilarska et al have successfully obtained well dispersive properties of magnesium sulfate by using PEGs of different weights as modifier. Zhu et al used vinyltriethoxysilane to modify the surface of MHSH whiskers by dry process to enhance the interfacial interaction of MHSH whiskers and surrounding matrix. Gao et al improved the compatibility with polymer by modifying the surface of MHSH nanowhiskers through grafting methyl methacrylate.…”

Section: Introductionmentioning

confidence: 99%

Surface modification of magnesium hydroxide sulfate hydrate whiskers and its toughness and reinforcement for polyvinyl chloride

et al. 2017

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In order to enhance the adhesion and compatibility of magnesium hydroxide sulfate hydrate (MHSH) whiskers with polyvinyl chloride (PVC), and prepare high performance MHSH/PVC composites, chitosan (CS) is coated on the surface of MHSH whiskers by a facile method. The effect of the CS‐coated MHSH (CS‐MHSH) whisker and its toughness and reinforcement for PVC are studied. A thin layer coated on the surface of MHSH whiskers after modification is investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The efficacy of surface modification is confirmed by fourier transform infrared spectroscopy (FTIR), X‐ray power diffraction analyses (XRD) and energy disperse spectroscopy (EDS). The optimum modification concentration of CS is 0.025%. The notched impact strength and flexural modulus of PVC composite with 15 phr CS‐MHSH whiskers are increased by 85.5% and 58.5% compared with those of pure PVC, and by 48.3% and 4.1% compared with those of the PVC composite with 15 phr unmodified MHSH whiskers. A better thermal stability of CS‐MHSH/PVC composite is showed by thermogravimetric analysis (TGA). Dynamic mechanical analysis (DMA) result indicates that CS‐MHSH whiskers have a better dispersion and a stronger interfacial adhesion with PVC matrix. POLYM. COMPOS., 39:3676–3685, 2018. © 2017 Society of Plastics Engineers

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“…[1,2]. MHSH whiskers are important inorganic materials [3,4], with various distinctive properties including low toxicity, high corrosion resistance, low density, high thermal stability and high elastic modulus [5][6][7][8][9], which have been widely used as resin additives of flame retardant for polymers, fillers, reinforcing agent, and acidic waste neutralizer for environmental protection, etc. [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Utilization of the MgO-Rich Residue Originated from Ludwigite Ore: Hydrothermal Synthesis of MHSH Whiskers

Zhang

et al. 2017

Minerals

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Abstract:In this work, from the MgO-enriched residue originated from ludwigite ore, value-added magnesium hydroxide sulfate hydrate (MHSH) whiskers were prepared via sulfuric acid leaching and leachate purification, followed by hydrothermal synthesis. During sulfuric acid leaching, 98.2% magnesium and 99.6% silica were removed under the optimal leaching conditions: sulfuric acid concentration of 40%, leaching temperature of 80 • C, leaching time of 90 min, and liquid to solid ratio of 4 mL/g. After purification of the acidic leachate via oxidation and precipitation to remove impurities including iron and aluminum, the Mg 2+ -rich solution was used to prepare magnesium hydroxide sulfate hydrate whiskers (5Mg(OH) 2 ·MgSO 4 ·2H 2 O, abbreviated as 512MHSH) via hydrothermal synthesis. Finally, 512MHSH whiskers were obtained with 30-100 µm in length, 0.5-1.0 µm in diameter and aspect ratio of approximately 100. The physicochemical characteristics of whiskers were further characterized by X-Ray Diffraction (XRD), Scanning Electron Microscopy-Energy Dispersive Spectroscopy (SEM-EDS), Fourier Transform Infrared Spectroscopy (FT-IR) and Thermogravimetry-Differential Scanning Calorimetry (TG-DSC).

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Surface modification of magnesium hydroxide sulfate hydrate whiskers using a silane coupling agent by dry process

Cited by 49 publications

References 22 publications

Surface modification of magnesium hydroxide and its application in flame‐retardant oil‐extended styrene–ethylene–butadiene–styrene/polypropylene composites

Surface modification of magnesium hydroxide and its application in flame‐retardant oil‐extended styrene–ethylene–butadiene–styrene/polypropylene composites

Surface modification of magnesium hydroxide sulfate hydrate whiskers and its toughness and reinforcement for polyvinyl chloride

Utilization of the MgO-Rich Residue Originated from Ludwigite Ore: Hydrothermal Synthesis of MHSH Whiskers

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