Effects of Cooling Ways on the Structure of Polypropylene Hollow Fiber Membranes Prepared by Stretching
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D.-J. Luo
, F.-J. Wei , H.-J. Shao , K.-Z. Zhang , Z.-Y. Cui , J. Yu and S.-H. Qin
Abstract
Air, water, and DINCH (Di-isononyl-cyclohexane-1,2-dicarboxylate) were selected as the cooling media to prepare polypropylene hollow fiber membranes by melt spinning. The effects of various cooling ways with different cooling rates on the row-nucleated lamellar crystallization were investigated. The crystallinity, orientation and arrangement of the crystals were examined by differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), and small-angle X-ray scattering (SAXS). Membrane morphology was observed by SEM. The less uniform pores, a layer of amorphous phase, and only a small part of slit-shaped pores were observed on the surface of samples when water and DINCH were used as the heat transfer medium because the fast cooling rate froze the surface molecules and decreased the crystallinity and orientation. However, when air was used as the cooling medium, the higher crystallinity and the better orientation of the annealed hollow fibers were obtained mainly due to the slow cooling rate. Corresponding hollow fiber membranes prepared by stretching had better interconnectivity of pores and larger pure water flux. Thus this study explains why air was selected as the cooling medium to prepare polypropylene hollow fiber membranes which can have larger pure water flux. Also, it provides new insights into the structure control of polypropylene hollow fiber membranes by stretching in order to prepare membranes with high strength.
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© 2019, Carl Hanser Verlag, Munich
Articles in the same Issue
- Contents
- Contents
- Regular Contributed Articles
- Flow-Fiber Coupled Viscosity in Injection Molding Simulations of Short Fiber Reinforced Thermoplastics
- Effects of Cooling Ways on the Structure of Polypropylene Hollow Fiber Membranes Prepared by Stretching
- Fill Factor Effects in Highly-Viscous Non-Isothermal Rubber Mixing Simulations
- Morphology and Isothermal Crystallization Kinetics of Polypropylene/Poly(ethylene-co-vinyl alcohol) Blends
- Mechanical and Thermal Properties of Teak Wood Flour/Starch Filled High Density Polyethylene Composites
- Three-Dimensional, Non-Isothermal Simulations of the Effect of Speed Ratio in Partially-Filled Rubber Mixing
- Edge Effect in Hot Embossing and its Influence on Global Pattern Replication of Polymer-Based Microneedles
- Enhancing Flame Retardancy, Thermal Stability, Physical and Mechanical Properties of Polyethylene Foam with Polyphosphate Modified Expandable Graphite and Ammonium Polyphosphate
- Processing LDS-Circuit Boards by Selective Laser Sintering
- Structural and Optical Characteristics of Laser Irradiated CdSe/PVA Nanocomposites
- The Effect of Ultraviolet Ageing on the Flame Retardancy, Thermal Stability and Mechanical Properties of LGFPP/IFR
- Preparation and Characterization of a Biocomposite Based on Cork Microparticles in Poly(β-hydroxybutyrate)-co-Poly(β-hydroxyvalerate) Matrix
- Partially Filled Flow Simulation Using Meshfree Method for High Viscosity Fluid in Plastic Mixer
- PPS News
- PPS News
- Seikei Kakou Abstracts
- Seikei-Kakou Abstracts
Articles in the same Issue
- Contents
- Contents
- Regular Contributed Articles
- Flow-Fiber Coupled Viscosity in Injection Molding Simulations of Short Fiber Reinforced Thermoplastics
- Effects of Cooling Ways on the Structure of Polypropylene Hollow Fiber Membranes Prepared by Stretching
- Fill Factor Effects in Highly-Viscous Non-Isothermal Rubber Mixing Simulations
- Morphology and Isothermal Crystallization Kinetics of Polypropylene/Poly(ethylene-co-vinyl alcohol) Blends
- Mechanical and Thermal Properties of Teak Wood Flour/Starch Filled High Density Polyethylene Composites
- Three-Dimensional, Non-Isothermal Simulations of the Effect of Speed Ratio in Partially-Filled Rubber Mixing
- Edge Effect in Hot Embossing and its Influence on Global Pattern Replication of Polymer-Based Microneedles
- Enhancing Flame Retardancy, Thermal Stability, Physical and Mechanical Properties of Polyethylene Foam with Polyphosphate Modified Expandable Graphite and Ammonium Polyphosphate
- Processing LDS-Circuit Boards by Selective Laser Sintering
- Structural and Optical Characteristics of Laser Irradiated CdSe/PVA Nanocomposites
- The Effect of Ultraviolet Ageing on the Flame Retardancy, Thermal Stability and Mechanical Properties of LGFPP/IFR
- Preparation and Characterization of a Biocomposite Based on Cork Microparticles in Poly(β-hydroxybutyrate)-co-Poly(β-hydroxyvalerate) Matrix
- Partially Filled Flow Simulation Using Meshfree Method for High Viscosity Fluid in Plastic Mixer
- PPS News
- PPS News
- Seikei Kakou Abstracts
- Seikei-Kakou Abstracts