The Experts below are selected from a list of 10461 Experts worldwide ranked by ideXlab platform
Beng Teik Poh - One of the best experts on this subject based on the ideXlab platform.
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Physicochemical and Rheological Properties of Novel Magnesium Salt-Polyacrylamide Composite Polymers
Journal of Dispersion Science and Technology, 2012Co-Authors: Khai Ern Lee, Imran Khan, Norhashimah Morad, Tjoon Tow Teng, Beng Teik PohAbstract:Two series of novel inorganic-organic composite polymers have been prepared through physical blending of Magnesium chloride and Magnesium hydroxide respectively with polyacrylamide aqueous solution. The physicochemical properties of the Magnesium Salt-polyacrylamide composite polymers were tuned by varying the ratio between the Magnesium Salt (e.g., Magnesium chloride and Magnesium hydroxide) and polyacrylamide. Characterizations of Magnesium Salt-polyacrylamide composite polymers were carried out via FTIR and TEM. Parameters such as solution conductivity and viscosity were also taken into account to characterize the physicochemical properties of the composite polymer aqueous solutions. Magnesium chloride-polyacrylamide (MCPAM) composite polymer aqueous solutions have a higher conductivity compared to Magnesium hydroxide-polyacrylamide (MHPAM) composite polymer aqueous solutions. The viscosities of the MHPAM composite polymer aqueous solutions were found higher than MCPAM composite polymer aqueous solutio...
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Thermal behavior and morphological properties of novel Magnesium Salt–polyacrylamide composite polymers
Polymer Composites, 2011Co-Authors: Khai Ern Lee, Imran Khan, Norhashimah Morad, Tjoon Tow Teng, Beng Teik PohAbstract:Magnesium Salt–polyacrylamide composite polymers have been prepared by blending Magnesium chloride and Magnesium hydroxide, respectively, with polyacrylamide aqueous solution. The thermal behavior of the dried Magnesium Salt–polyacrylamide composite polymers has been studied. Differential scanning calorimetric (DSC) analysis and thermal gravimetric analysis (TGA) were carried out to investigate the changes of the composite polymers' behavior with temperature. The kinetics of the thermal decomposition of Magnesium Salt–polyacrylamide composite polymers was investigated over temperature range of 35–800°C with three heating rates of 10, 20, and 40°C/min under nitrogen atmosphere. Flynn and Wall's model was usedto determine the activation energies of thermal decomposition for Magnesium Salt–polyacrylamide composite polymers. The activation energies needed to decompose 50 wt% of Magnesium hydroxide-polyacrylamide (MHPAM) composite polymer ranged from of 28.993–174.307 kJ/mol which are higher than the values for Magnesium chloride–polyacrylamide (MCPAM) composite polymer (21.069–39.412 kJ/mol). Therefore, MHPAM composite polymer has a better thermal stability compared with MCPAM composite polymer. The morphological properties of Magnesium Salt–polyacrylamide composite polymers were studied using scanning electron microscopy (SEM). Energy-dispersive X-ray (EDX) spectroscopy was used to determine the composition of the chemical elements. POLYM. COMPOS., 2011. © 2011 Society of Plastics Engineers
Jinkai Zhang - One of the best experts on this subject based on the ideXlab platform.
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Synthesis and characterization of novel organic Magnesium Salt flame retardant
Materials Letters, 2014Co-Authors: Hong Yan, Meng Zhang, Jinkai ZhangAbstract:Abstract Magnesium hydroxide (MH), being an environment-friendly flame retardant, are usually added into polymers to obtain satisfying flame retardancy in high loading. Bad compatibility and high loading both cause poor mechanical properties of polymer composites. In this paper, organic groups were introduced into the molecular structure of MH, which can take part in the synthetic reaction of polymer and then be grafted on long chains of polymer. It is promising that the integrated performance of flame retardancy and good mechanic properties can be achieved at the same time. Pure terephthalic acid (PTA) was chosen to react with MH in organic solvent to obtain an organic Magnesium Salt (OMS) containing organic groups. The obtained OMS was characterized in terms of morphology, particle size, crystal structure, and thermal stability by field-emission scanning electron microscopy (FESEM), X-ray power diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA). Moreover, the molecular structure of OMS was verified by mass spectrometry (MS).
Chun-chi Wang - One of the best experts on this subject based on the ideXlab platform.
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Simultaneous determination of l-ascorbic acid, ascorbic acid-2-phosphate Magnesium Salt, and ascorbic acid-6-palmitate in commercial cosmetics by micellar electrokinetic capillary electrophoresis.
Analytica chimica acta, 2006Co-Authors: Chun-chi WangAbstract:Abstract l -Ascorbic acid (LAA) can be used as a whitening agent in cosmetics. Because of its instability, some more stable derivatives have been developed to control melanin production, such as ascorbic acid-2-phosphate Magnesium Salt (AAPM) and ascorbic acid-6-palmitate (AA6P). To assess the quality of cosmetics, a micellar electrokinetic capillary electrophoresis technique (MEKC) was established for simultaneous analysis of AA and its two derivatives. Separation was performed with 10 mM borate (pH 9.5) containing 50 mM sodium dodecyl sulfate (SDS) at 20 kV. The detection wavelength was 265 nm. Several parameters, including borate concentration, buffer pH, and SDS level, were investigated. On method validation, calibration curves were linear over a concentration range of 150.0–1000.0 μM for LAA and 200.0–1000.0 μM for AAPM and AA6P. For intraday and interday analysis, relative standard deviation and relative errors were all less than 3%. Limits of detection were 70 μM for AAPM and AA6P, and 50 μM for LAA. All recoveries were greater than 95%. This method was applied to quality control of commercial cosmetics.
Rui Wang - One of the best experts on this subject based on the ideXlab platform.
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Thermal stability and flame retardancy of PET/Magnesium Salt composites
Polymer Degradation and Stability, 2010Co-Authors: Haiming Liu, Rui WangAbstract:Abstract Nano-Mg(OH) 2 (nanometre Magnesium hydroxide, nano-MH) was successfully introduced into the esterification and polycondensation system by in situ polymerization to obtain PET/Magnesium Salt composites (PETMS). The thermal properties and flame retardancy of PETMS were investigated by differential scanning calorimeter (DSC), thermogravimetric analysis (TGA), UL-94 vertical burning and limited oxygen index (LOI) test. The DSC and TGA results show that Magnesium Salts in the PET matrix have little effect on the thermal properties of PET, but a significant effect on the thermal stabilities of the composites. The results of LOI and UL-94 test show PETMS have higher LOI values (≥25%) and V-0 rating without melt dripping in the UL-94 test, indicating that PETMS have good flame retardancy and anti-dripping property. Moreover, the residues of Magnesium Salts and composites after TGA test were also studied by Fourier transform infrared spectroscopy (FTIR) to better understand the mechanism of flame retardancy, which reveals that Magnesium Salts accelerate the degradation of PET and catalyze the formation of char. The SEM results show the morphological structures of the char effectively protect the composites’ internal structures and inhibit the heat, smoke transmission and reduce the fuel gases when the fire contacts them.
Hua Xie - One of the best experts on this subject based on the ideXlab platform.
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Study on Thermal Decomposition Characteristics of Magnesium Salt Flame Retardants
Advanced Materials Research, 2014Co-Authors: Xu Zhang, Hua Xie, Rui FengAbstract:Magnesium Salt flame retardant is a new filler flame retardant agent, and can release the water and absorb the latent heat during the thermal decomposition, which can effectively inhibit the polymers decomposition and cool the combustible gas generated in the case of fire. In this paper, the Magnesium Salt flame retardant is synthesized in different conditions. Then the thermal decomposition features of the Magnesium Salt flame retardants with the smallest particle diameters are characterized by using thermogravimetric analysis and differential thermal analysis. Finally, on the basis of this analysis, optimization parameters for preparing the Magnesium Salt flame retardant with good thermal decomposition performance are obtained, which may be helpful for guiding the preparation of high-performance Magnesium Salt flame retardants and providing a beneficial reference.
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Thermal Properties Study of Magnesium Salt Flame Retardants Prepared by Different Alkali Sources
Applied Mechanics and Materials, 2014Co-Authors: Xu Zhang, Hua XieAbstract:Magnesium Salt flame retardant is an additive flame retardant with environmental protection performance, which has been successfully applied in various industries because of its many advantages. In this paper, the chemical precipitation method is used to prepare Magnesium Salt flame retardants with different alkali sources (sodium hydroxide and ammonia) and reaction temperatures. And then, study on the thermal properties of all samples is systematically carried out on the basis of differential thermal analysis. These investigations could build up a link between the thermal property and growth behaviors of Magnesium Salt, which may offer us theoretical help.
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Effect of Different Parameters on Particle Diameters of Magnesium Salt Flame Retardants
Advanced Materials Research, 2013Co-Authors: Xu Zhang, Hua XieAbstract:The impact of the reaction temperature, ammonia concentration, aging time and molar ratio on the particle diameters of Magnesium Salt flame retardants have been systematically investigated through preparing Magnesium Salt powders under different conditions. Particle diameters are characterized by laser particle size analyzer, and the effect of different factors on the particle diameters is discussed, respectively. On the basis of the analysis, optimization parameters for synthesizing Magnesium Salts with the minimum particle diameters are found, which may be very helpful to the development of Magnesium Salt flame retardants
