The Experts below are selected from a list of 291 Experts worldwide ranked by ideXlab platform

Ismail A. Al-raheil - One of the best experts on this subject based on the ideXlab platform.

  • On the triple Melting Behaviour of poly(ethylene succinate)
    Polymer International, 1995
    Co-Authors: Ismail A. Al-raheil, Ali M. Qudah
    Abstract:

    The morphology of melt-crystallized poly(ethylene succinate) (PES) was investigated by optical microscopy and scanning electron microscopy, and the Melting Behaviour of PES was studied by differential scanning calorimetry (DSC). At low crystallization temperature imperfect crystals were formed which could melt and recrystallize during the DSC scan. Triple Melting peaks were observed, and the Melting Behaviour was strongly dependent on crystallization time and scan rate. It was observed that crystallization at high temperature perfected the crystals (dominant and subsidiary lamellae in the spherulitic structure). Increasing the scan rate reduced the chance for reorganization. However, at high crystallization temperature two Melting peaks were observed. The material formed was much more perfect, so that the Melting process was not dominated by recrystallization. Accordingly, the cause of dual Melting is the existence of two kinds of crystal perfection.

  • Morphology and Melting Behaviour of poly(butylene terephthalate)
    Polymer International, 1995
    Co-Authors: Ismail A. Al-raheil, Ali M. Qudah
    Abstract:

    A detailed description of the morphology and the complex Melting Behaviour of poly(butylene terephthalate) crystallized isothermally from the melt is presented. Triple, double, or single Melting endotherms can deliberately be obtained by varying the heating rate in the differential scanning calorimeter (DSC). At low crystallization temperatures, T c , triple Melting endotherms were seen when the specimen was scanned at 10 o C/min, while at high T c a single endotherm was seen. In the case of the triple Melting peaks, the first endotherm corresponds to Melting of the imperfect crystals formed at the crystallization temperature. The second endotherm originates from Melting of the perfect crystals in the initial distribution, and to some recrystallized material. The third endotherm is due to Melting of the original crystalline material reorganized during the DSC scan. A detailed morphological study of the isothermally crystallized samples by electron microscopy showed that dominant and subsidiary lamellae in the spherulitic structure are related to perfect and imperfect crystals, respectively

  • Morphology and Melting Behaviour of poly(vinylidene fluoride) crystallized from the melt
    Polymer International, 1995
    Co-Authors: Ali M. Qudah, Ismail A. Al-raheil
    Abstract:

    The influence of crystallization temperature on the Melting Behaviour and the morphology of poly(vinylidene fluoride) (PVF 2 ) has been investigated. The DSC endotherms of PVF 2 crystallized from the melt show at least two peaks. The peak areas depend on the thermal history of the samples and the heating scan rate. The area of the first peak was found to increase as the crystallization temperature or the scan rate increased. The double peak configuration was attributed to a Melting-recrystallization process. Electron microscopy supports these results, for which only one type of lamella was found in the spherulitic structure.

  • Morphology and Melting Behaviour of poly(ethylene terephthalate) crystallized from the glassy state
    Polymer International, 1995
    Co-Authors: Ali M. Qudah, Ismail A. Al-raheil
    Abstract:

    The influence of annealing conditions on the morphology and Melting Behaviour of poly(ethylene terephthalate) (PET) was studied. PET annealed under isothermal conditions often shows double Melting endotherms depending on the annealing temperature (T a ) and the heating rate of the calorimeter. It was found that the morphological structure and the lower Melting peak depend strongly on the annealing temperature, T a . The increase of the lower Melting peak temperature with T a is due to an increase of the lamellar thickness within the spherulitic structure and to a higher crystallite perfection.

Ali M. Qudah - One of the best experts on this subject based on the ideXlab platform.

  • On the triple Melting Behaviour of poly(ethylene succinate)
    Polymer International, 1995
    Co-Authors: Ismail A. Al-raheil, Ali M. Qudah
    Abstract:

    The morphology of melt-crystallized poly(ethylene succinate) (PES) was investigated by optical microscopy and scanning electron microscopy, and the Melting Behaviour of PES was studied by differential scanning calorimetry (DSC). At low crystallization temperature imperfect crystals were formed which could melt and recrystallize during the DSC scan. Triple Melting peaks were observed, and the Melting Behaviour was strongly dependent on crystallization time and scan rate. It was observed that crystallization at high temperature perfected the crystals (dominant and subsidiary lamellae in the spherulitic structure). Increasing the scan rate reduced the chance for reorganization. However, at high crystallization temperature two Melting peaks were observed. The material formed was much more perfect, so that the Melting process was not dominated by recrystallization. Accordingly, the cause of dual Melting is the existence of two kinds of crystal perfection.

  • Morphology and Melting Behaviour of poly(butylene terephthalate)
    Polymer International, 1995
    Co-Authors: Ismail A. Al-raheil, Ali M. Qudah
    Abstract:

    A detailed description of the morphology and the complex Melting Behaviour of poly(butylene terephthalate) crystallized isothermally from the melt is presented. Triple, double, or single Melting endotherms can deliberately be obtained by varying the heating rate in the differential scanning calorimeter (DSC). At low crystallization temperatures, T c , triple Melting endotherms were seen when the specimen was scanned at 10 o C/min, while at high T c a single endotherm was seen. In the case of the triple Melting peaks, the first endotherm corresponds to Melting of the imperfect crystals formed at the crystallization temperature. The second endotherm originates from Melting of the perfect crystals in the initial distribution, and to some recrystallized material. The third endotherm is due to Melting of the original crystalline material reorganized during the DSC scan. A detailed morphological study of the isothermally crystallized samples by electron microscopy showed that dominant and subsidiary lamellae in the spherulitic structure are related to perfect and imperfect crystals, respectively

  • Morphology and Melting Behaviour of poly(vinylidene fluoride) crystallized from the melt
    Polymer International, 1995
    Co-Authors: Ali M. Qudah, Ismail A. Al-raheil
    Abstract:

    The influence of crystallization temperature on the Melting Behaviour and the morphology of poly(vinylidene fluoride) (PVF 2 ) has been investigated. The DSC endotherms of PVF 2 crystallized from the melt show at least two peaks. The peak areas depend on the thermal history of the samples and the heating scan rate. The area of the first peak was found to increase as the crystallization temperature or the scan rate increased. The double peak configuration was attributed to a Melting-recrystallization process. Electron microscopy supports these results, for which only one type of lamella was found in the spherulitic structure.

  • Morphology and Melting Behaviour of poly(ethylene terephthalate) crystallized from the glassy state
    Polymer International, 1995
    Co-Authors: Ali M. Qudah, Ismail A. Al-raheil
    Abstract:

    The influence of annealing conditions on the morphology and Melting Behaviour of poly(ethylene terephthalate) (PET) was studied. PET annealed under isothermal conditions often shows double Melting endotherms depending on the annealing temperature (T a ) and the heating rate of the calorimeter. It was found that the morphological structure and the lower Melting peak depend strongly on the annealing temperature, T a . The increase of the lower Melting peak temperature with T a is due to an increase of the lamellar thickness within the spherulitic structure and to a higher crystallite perfection.

Yong Wang - One of the best experts on this subject based on the ideXlab platform.

  • co Melting Behaviour of sucrose glucose fructose
    Food Chemistry, 2019
    Co-Authors: Yong Wang, Tuyen Truong, Bhesh Bhandari
    Abstract:

    The co-Melting Behaviour of sugar mixtures, comprising sucrose, glucose and fructose at various binary (3:1, 1:1, 1:3, 1:7, 1:15) and ternary (4:1:1, 2:1:1, 1:1:1, 2:5:5, 2:11:11, 1:4:1, 1:10:1) ratios, was studied using DSC. The Melting temperature of sucrose was found to decrease in the presence of either fructose or glucose. In the sugar mixtures, the Melting enthalpy of sucrose decreased compared with the proportional calculated values, using the percentage equation, whilst the Melting enthalpy of fructose or glucose increased at the same time, implying the Melting or dissolution of sucrose together with fructose or glucose. The tested enthalpy is usually higher than the calculated enthalpy for fructose, but lower than the calculated enthalpy for sucrose. Microscopic pictures showed that sucrose crystals could melt and dissolve gradually in the fructose melt liquid. This study provides useful information for both fundamental understanding of sugars co-Melting and food industry applications.

Wenjing Yang - One of the best experts on this subject based on the ideXlab platform.

  • particle scale simulation of softening Melting Behaviour of multiple layers of particles in a blast furnace cohesive zone
    Powder Technology, 2015
    Co-Authors: Wenjing Yang, Zongyan Zhou, David Pinson
    Abstract:

    Abstract The cohesive zone, where ore particles soften and melt into liquid, plays a significant role in determining the layer permeability and structure, hence the flow of gas and liquid in a blast furnace. In this paper, the softening and Melting Behaviour of particles, coupled with gas flow and heat transfer, is investigated by means of the combined approach of computational fluid dynamics (CFD) for gas phase and discrete element method (DEM) for solid phase. In connection with the previous experimental study, wax and glass particles are used to simulate ore and coke particles, respectively, and the particles are arranged in different alternative layers in a packed bed to simulate the furnace operation. The effects of different variables such as layer configurations and gas properties on the softening and Melting of wax particles are examined. It is demonstrated that the layer thickness and position have an obvious effect on the layer deformation and permeability, and hence gas flow; improved gas flow can be achieved in multiple layer operations. The approach and findings should be useful to the establishment of a comprehensive picture about softening and Melting Behaviour of particles, and their effect on blast furnace operation.

  • Particle scale simulation of softening–Melting Behaviour of multiple layers of particles in a blast furnace cohesive zone
    Powder Technology, 2015
    Co-Authors: Wenjing Yang, Zongyan Zhou, David Pinson
    Abstract:

    Abstract The cohesive zone, where ore particles soften and melt into liquid, plays a significant role in determining the layer permeability and structure, hence the flow of gas and liquid in a blast furnace. In this paper, the softening and Melting Behaviour of particles, coupled with gas flow and heat transfer, is investigated by means of the combined approach of computational fluid dynamics (CFD) for gas phase and discrete element method (DEM) for solid phase. In connection with the previous experimental study, wax and glass particles are used to simulate ore and coke particles, respectively, and the particles are arranged in different alternative layers in a packed bed to simulate the furnace operation. The effects of different variables such as layer configurations and gas properties on the softening and Melting of wax particles are examined. It is demonstrated that the layer thickness and position have an obvious effect on the layer deformation and permeability, and hence gas flow; improved gas flow can be achieved in multiple layer operations. The approach and findings should be useful to the establishment of a comprehensive picture about softening and Melting Behaviour of particles, and their effect on blast furnace operation.

David Pinson - One of the best experts on this subject based on the ideXlab platform.

  • particle scale simulation of softening Melting Behaviour of multiple layers of particles in a blast furnace cohesive zone
    Powder Technology, 2015
    Co-Authors: Wenjing Yang, Zongyan Zhou, David Pinson
    Abstract:

    Abstract The cohesive zone, where ore particles soften and melt into liquid, plays a significant role in determining the layer permeability and structure, hence the flow of gas and liquid in a blast furnace. In this paper, the softening and Melting Behaviour of particles, coupled with gas flow and heat transfer, is investigated by means of the combined approach of computational fluid dynamics (CFD) for gas phase and discrete element method (DEM) for solid phase. In connection with the previous experimental study, wax and glass particles are used to simulate ore and coke particles, respectively, and the particles are arranged in different alternative layers in a packed bed to simulate the furnace operation. The effects of different variables such as layer configurations and gas properties on the softening and Melting of wax particles are examined. It is demonstrated that the layer thickness and position have an obvious effect on the layer deformation and permeability, and hence gas flow; improved gas flow can be achieved in multiple layer operations. The approach and findings should be useful to the establishment of a comprehensive picture about softening and Melting Behaviour of particles, and their effect on blast furnace operation.

  • Particle scale simulation of softening–Melting Behaviour of multiple layers of particles in a blast furnace cohesive zone
    Powder Technology, 2015
    Co-Authors: Wenjing Yang, Zongyan Zhou, David Pinson
    Abstract:

    Abstract The cohesive zone, where ore particles soften and melt into liquid, plays a significant role in determining the layer permeability and structure, hence the flow of gas and liquid in a blast furnace. In this paper, the softening and Melting Behaviour of particles, coupled with gas flow and heat transfer, is investigated by means of the combined approach of computational fluid dynamics (CFD) for gas phase and discrete element method (DEM) for solid phase. In connection with the previous experimental study, wax and glass particles are used to simulate ore and coke particles, respectively, and the particles are arranged in different alternative layers in a packed bed to simulate the furnace operation. The effects of different variables such as layer configurations and gas properties on the softening and Melting of wax particles are examined. It is demonstrated that the layer thickness and position have an obvious effect on the layer deformation and permeability, and hence gas flow; improved gas flow can be achieved in multiple layer operations. The approach and findings should be useful to the establishment of a comprehensive picture about softening and Melting Behaviour of particles, and their effect on blast furnace operation.