The Experts below are selected from a list of 29610 Experts worldwide ranked by ideXlab platform

Lars Berglund - One of the best experts on this subject based on the ideXlab platform.

Xiaohui Liu - One of the best experts on this subject based on the ideXlab platform.

R.d.k. Misra - One of the best experts on this subject based on the ideXlab platform.

  • Nonisothermal Crystallization Behavior of glass‐bead‐filled polypropylene
    Journal of Applied Polymer Science, 2006
    Co-Authors: Q. Yuan, Wei Jiang, R.d.k. Misra
    Abstract:

    The effects of the glass-bead content and size on the nonisothermal Crystallization Behavior of polypropylene (PP)/glass-bead blends were studied with differential scanning calorimetry. The degree of crystallinity decreased with the addition of glass bead, and the Crystallization temperature of the blends was marginally higher than that of pure PP at various cooling rates. Furthermore, the half-time for Crystallization decreased with an increase in the glass-bead content or particle size, implying the nucleating role of the glass beads. The nonisothermal Crystallization data were analyzed with the methods of Avrami, Ozawa, and Mo. The validity of various kinetic models for the nonisothermal Crystallization process of PP/glass-bead blends was examined. The approach developed by Mo successfully described the nonisothermal Crystallization Behavior of PP and PP/glass-bead blends. Finally, the activation energy for the nonisothermal Crystallization of pure PP and PP/glass-bead blends based on the Kissinger method was evaluated.

  • nonisothermal Crystallization Behavior of polypropylene clay nanocomposites
    European Polymer Journal, 2006
    Co-Authors: Q. Yuan, S. Awate, R.d.k. Misra
    Abstract:

    Abstract The influence of two concentrations of clay nanoparticles on the nonisothermal Crystallization Behavior of the intercalated polypropylene–clay nanocomposites is investigated here. It is observed that the Crystallization peak temperature ( T p ) of PP–clay nanocomposites is marginally higher than neat PP at various cooling rates. Furthermore, the half-time for Crystallization ( t 0.5 ) decreased with increase in clay content, implying the nucleating role of clay nanoparticles. The nonisothermal Crystallization data is analyzed using Avrami, Ozawa and Mo and coworkers methods. The validity of kinetic models on the nonisothermal Crystallization process of PP–clay nanocomposites is discussed. The approach developed by Mo and coworkers successfully describes the nonisothermal Crystallization Behavior of PP and PP–clay nanocomposites. The activation energy for nonisothermal Crystallization of pure PP and PP–clay nanocomposites based on Kissinger method is evaluated.

  • Nonisothermal Crystallization Behavior of polypropylene–clay nanocomposites
    European Polymer Journal, 2006
    Co-Authors: Q. Yuan, S. Awate, R.d.k. Misra
    Abstract:

    Abstract The influence of two concentrations of clay nanoparticles on the nonisothermal Crystallization Behavior of the intercalated polypropylene–clay nanocomposites is investigated here. It is observed that the Crystallization peak temperature ( T p ) of PP–clay nanocomposites is marginally higher than neat PP at various cooling rates. Furthermore, the half-time for Crystallization ( t 0.5 ) decreased with increase in clay content, implying the nucleating role of clay nanoparticles. The nonisothermal Crystallization data is analyzed using Avrami, Ozawa and Mo and coworkers methods. The validity of kinetic models on the nonisothermal Crystallization process of PP–clay nanocomposites is discussed. The approach developed by Mo and coworkers successfully describes the nonisothermal Crystallization Behavior of PP and PP–clay nanocomposites. The activation energy for nonisothermal Crystallization of pure PP and PP–clay nanocomposites based on Kissinger method is evaluated.

Xiabin Jing - One of the best experts on this subject based on the ideXlab platform.

  • Crystallization Behavior of asymmetric PLLA/PDLA blends.
    The journal of physical chemistry. B, 2011
    Co-Authors: Jingru Sun, Xiuli Zhuang, Xuesi Chen, Xiabin Jing
    Abstract:

    The effects of the addition of poly(d-lactide) (PDLA) on the Crystallization Behavior of poly(l-lactide)(PLLA) were investigated by means of differential scanning calorimetry (DSC) and temperature-dependent X-ray diffraction(XRD). When the blends were cooled from different temperatures (250, 240, and 190 °C) at the rate of cooling of 5 °C/min, stereocomplex (sc) crystallites could stay at diverse states. Accordingly, the stereocomplexes acted as a nucleation agent exerting distinct effects on PLLA Crystallization. The speculated mechanisms of the stereocomplex formation and the effectiveness as a nucleating agent are schematically described. Moreover, temperature-dependent XRD was carried out to further investigate the melt-Crystallization Behavior of PLLA/PDLA blends in real time. Temperature-dependent XRD results indicated that even at 240 °C the stereocomplex crystallites in all blend samples existed clearly, which could not be detected by DSC. These XRD results further suggest that the onset Tc values...

  • Crystallization Behavior of asymmetric plla pdla blends
    Journal of Physical Chemistry B, 2011
    Co-Authors: Jingru Sun, Xiuli Zhuang, Xuesi Chen, Xiabin Jing
    Abstract:

    The effects of the addition of poly(d-lactide) (PDLA) on the Crystallization Behavior of poly(l-lactide)(PLLA) were investigated by means of differential scanning calorimetry (DSC) and temperature-dependent X-ray diffraction(XRD). When the blends were cooled from different temperatures (250, 240, and 190 °C) at the rate of cooling of 5 °C/min, stereocomplex (sc) crystallites could stay at diverse states. Accordingly, the stereocomplexes acted as a nucleation agent exerting distinct effects on PLLA Crystallization. The speculated mechanisms of the stereocomplex formation and the effectiveness as a nucleating agent are schematically described. Moreover, temperature-dependent XRD was carried out to further investigate the melt-Crystallization Behavior of PLLA/PDLA blends in real time. Temperature-dependent XRD results indicated that even at 240 °C the stereocomplex crystallites in all blend samples existed clearly, which could not be detected by DSC. These XRD results further suggest that the onset Tc values...

Samuel Kofi Tulashie - One of the best experts on this subject based on the ideXlab platform.

  • solid phase and oscillating solution Crystallization Behavior of and n methylephedrine
    Journal of Pharmaceutical Sciences, 2016
    Co-Authors: Samuel Kofi Tulashie, D. Polenske, Andreas Seidelmorgenstern, Heike Lorenz
    Abstract:

    This work involves the study of the solid-phase and solution Crystallization Behavior of the N-methylephedrine enantiomers. A systematic investigation of the melt phase diagram of the enantiomeric N-methylephedrine system was performed considering polymorphism. Two monotropically related modifications of the enantiomer were found. Solubilities and the ternary solubility phase diagrams of N-methylephedrine enantiomers in 2 solvents [isopropanol:water, 1:3 (Vol) and (2R, 3R)-diethyl tartrate] were determined in the temperature ranges between 15°C and 25°C, and 25°C and 40°C, respectively. Preferential nucleation and Crystallization experiments at higher supersaturation leading to an unusual oscillatory Crystallization Behavior as well as a successful preferential Crystallization experiment at lower supersaturation are presented and discussed.

  • Solid-Phase and Oscillating Solution Crystallization Behavior of (+)- and (−)-N-Methylephedrine
    Journal of pharmaceutical sciences, 2016
    Co-Authors: Samuel Kofi Tulashie, D. Polenske, Andreas Seidel-morgenstern, Heike Lorenz
    Abstract:

    This work involves the study of the solid-phase and solution Crystallization Behavior of the N-methylephedrine enantiomers. A systematic investigation of the melt phase diagram of the enantiomeric N-methylephedrine system was performed considering polymorphism. Two monotropically related modifications of the enantiomer were found. Solubilities and the ternary solubility phase diagrams of N-methylephedrine enantiomers in 2 solvents [isopropanol:water, 1:3 (Vol) and (2R, 3R)-diethyl tartrate] were determined in the temperature ranges between 15°C and 25°C, and 25°C and 40°C, respectively. Preferential nucleation and Crystallization experiments at higher supersaturation leading to an unusual oscillatory Crystallization Behavior as well as a successful preferential Crystallization experiment at lower supersaturation are presented and discussed.