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Mahdi Ghelichi,Nader Taheri Qazvini,Seyed Hassan Jafari,Hossein Ali Khonakdar 한국고분자학회 2013 Macromolecular Research Vol.21 No.4
The influence for the minor amount of sodium montmorillonite (Na+-MMT) nanoclay on the thermorheological complexity of a miscible blend of 20 wt% poly(ethylene oxide) (PEO) in poly(methyl methacrylate)(PMMA) is studied. The dispersion of Na+-MMT in the PEO/PMMA is assessed via X-ray diffraction. The empirical principle of time-temperature superposition is found to be partially restored in the case of blend nanocomposite,whereas it fails for the neat PEO/PMMA blend. The relaxation times of each component are determined from the oscillatory shear rheometry data in the form of a monomeric friction coefficient. The chain dynamics of components is coupled in the presence of hydrophilic nanoclay, which preferentially adsorbs PEO. The self-concentration model of Lodge and McLeish successfully describes the temperature dependence of the PMMA monomeric friction coefficient in both the neat and blend nanocomposite in regards to the temperature range studied.
Flocculation properties of a natural polyampholyte
Mohammad Nazarzadeh,Nasser Nikfarjam,Nader Taheri Qazvini 대한환경공학회 2017 Environmental Engineering Research Vol.22 No.3
Polyelectrolytes are commonly used as flocculants in drinking water treatment. However the growing concerns about their toxicity have motivated the search for biocompatible flocculants. Here, we show that gelatin, a natural amphoteric polyelectrolyte, can be effectively adsorbed on clay surfaces and can potentially be a suitable substitute for existing flocculants. The adsorption of gelatin from its aqueous solution onto the mineral clay surfaces at different conditions was systematically investigated using the design of experiments methodology. The gelatin adsorption was found to vary considerately with pH variation showed a maximum adsorption at its isoelectric point. The amount of adsorbed gelation increased with increasing pH from 3 to 5, attained a maximum at pH 5 and then decreased with increasing pH from 5 to 11. Similarly, the amount of adsorbed gelatin showed decreasing trends around salt concentration of 0.05 M and temperature 35°C. On the other hand, the adsorption was continuously increased with time and polymer concentration in the range of 0.1-0.9 mg/dL. Finally, the jar tests confirmed the ability of gelatin for using a natural flocculant for water treatment.