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RISS 인기검색어
- 검색키워드
- 저자 : Mingcai Chen (검색결과 3 건)
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Zhang, Huaiping,Li, Wei,Cao, Qing,Chen, Mingcai 한국유변학회 2014 Korea-Australia rheology journal Vol.26 No.2
Hydrophobically modified (HM) polyelectrolytes were prepared by using precipitation polymerization of acrylic acid (AA) and octadecyl acrylate (ODA) in various molar ratios in supercritical carbon dioxide. The product was obtained in the form of a white powder and the micrographs show aggregates of primary particles < $1{\mu}m$ in size. The effects of polymer concentration, ODA content in polymer, surfactant, shear time, shear rate on the apparent viscosity were investigated. The reason leaded to a significant viscosity enhancement was discussed. Steady-state and oscillatory tests of solution were also investigated. Solution exhibited shear thinning behavior and thixotropy. Polymers contain octadecyl acrylate (3.4 mol%) at 0.2 g/dL behaved as high entanglement structures or association gels, since the modulus $G^{\prime}$ were being higher than $G^{{\prime}{\prime}}$ throughout the frequency range. The comparison of apparent and complex viscosities confirmed the association gel properties.
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Huaiping Zhang,Wei Li,Qing Cao,Mingcai Chen 한국유변학회 2014 Korea-Australia rheology journal Vol.26 No.2
Hydrophobically modified (HM) polyelectrolytes were prepared by using precipitation polymerization ofacrylic acid (AA) and octadecyl acrylate (ODA) in various molar ratios in supercritical carbon dioxide. Theproduct was obtained in the form of a white powder and the micrographs show aggregates of primary particles< 1 μm in size. The effects of polymer concentration, ODA content in polymer, surfactant, shear time,shear rate on the apparent viscosity were investigated. The reason leaded to a significant viscosity enhancementwas discussed. Steady-state and oscillatory tests of solution were also investigated. Solution exhibitedshear thinning behavior and thixotropy. Polymers contain octadecyl acrylate (3.4 mol%) at 0.2 g/dLbehaved as high entanglement structures or association gels, since the modulus G' were being higher thanG" throughout the frequency range. The comparison of apparent and complex viscosities confirmed theassociation gel properties.
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Xin Liu,Kai Xu,Huan Liu,Hualun Cai,Zien Fu,Ying Guo,Mingcai Chen 한국고분자학회 2012 Macromolecular Research Vol.20 No.6
Four series of cross-linked polyurethanes with polyester polyols as soft segments were prepared by selfcuring of isocyanate-terminated polyurethanes. Polyester polyols herein were derived from different dimer fatty acids weight content, such as dicarboxylic acid leading to various hydrophobicity and steric hindrance. The structure of cross-linked polyurethane was characterized by Fourier transform infrared spectroscopy (FTIR). The surface properties and mechanical and thermal properties of cross-linked polyurethane were investigated using contact meter, tensile tester, differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The results indicated that with increasing dimer fatty acid weight content from 0% to 100%, the cross-linked polyurethanes exhibited increased hydrophobicity (water contact angle increased from 91o to 96o), improved water resistance (water uptake decreased from 1.41% to 0.34%), toluene resistance (weight loss decreased from 33.2% to 22.7%), and hydrolytic resistance (weight loss decreased from 0.60% to 0.27%), enhanced mechanical properties (tensile strength increased from 1.3 to 4.8 MPa), and thermal stability (decomposition temperature of 50% weight loss increased from 425 to 462 oC).
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