Comparative Study of Structure Development in Melt Spinning Polyolefin Fibers
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C.-H. Choi
Abstract
A comparative study of crystallization and orientation development in melt spinning is presented for four polyolefins: high density polyethylene (PE), polypropylene (PP), polybutylene (PB-1), and poly-4-methylpentene-1 (P4MP). The purpose was to compare the behavior of two relatively unknown polyolefins PB-1 and P4MP with the much better known and characterized PE and PP. Melt spinning was carried out at different temperatures. Melt spun filaments were characterized by wide angle x-ray diffraction (WAXS), birefringence and differential scanning calorimetry (DSC) measurements. Polymorphism (multiple crystalline states) is noted in the filaments of polybutylene which exhibits aging from one form to another as well as in polypropylene. Careful attention is given to heat transfer during cooling. The orientation of flexible chains in the melt state is well known to be determined by the stress field. The crystalline orientation of the solidified crystalline filaments as a function of spinline stress is found by WAXS to be highest for the P4MP and lowest for the PE. Birefringences of the melt spun PE fiber are however higher than PP or PB-1 and P4MP which had the lowest values when comparisons are made at the same spinline stress. However if intrinsic birefringence was used, the data order the same as the WAXS results.
© 1998, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- J. A. Biesenberger, G. Astarita, D. C. Bogue
- Screw Extrusion/Mixing
- Modeling Solids Conveying in Polymer Extruders
- Comparison between LDPE Conventional and Autothermal Extrusion Characteristics
- Transesterification of Ethylene Acetate Copolymer in a Twin Screw Extruder
- Stabilising the Structure of HDPE by the Use of Highly-dispersed Mixture of Fe/FeO
- Pumping Characteristics of an Intermeshing Co-rotating Twin Screw Extruder
- Flow Behaviour of Blends of Poly(ethylene-Co-Acrylic Acid) and Epoxidised Natural Rubber
- Die Extrusion
- Rheological Behaviour of HDPE/PA 11 Blends
- Melt Flow Properties of LDPE/HDPE Blends in Capillary Extrusion
- Fibers and Film
- Rheological Behaviour of LLDPE/LDPE Blends under Elongational Deformation
- Processing/Structure Relationships of Mica-Filled PE-Films with Low Oxygen Permeability
- On the Charge State of Melt-Blown Polymer Materials
- Temperature Measuring in Plastics Processing with Infrared Radiation Thermometers
- Comparative Study of Structure Development in Melt Spinning Polyolefin Fibers
- Moulding
- Sintering Rheology of Semi-Crystalline Polymers
- Molding
- Melt Flow Instabilities of Filled HDPE
- Experimental Validation of Shrinkage Predictions for Injection Molded Products
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- J. A. Biesenberger, G. Astarita, D. C. Bogue
- Screw Extrusion/Mixing
- Modeling Solids Conveying in Polymer Extruders
- Comparison between LDPE Conventional and Autothermal Extrusion Characteristics
- Transesterification of Ethylene Acetate Copolymer in a Twin Screw Extruder
- Stabilising the Structure of HDPE by the Use of Highly-dispersed Mixture of Fe/FeO
- Pumping Characteristics of an Intermeshing Co-rotating Twin Screw Extruder
- Flow Behaviour of Blends of Poly(ethylene-Co-Acrylic Acid) and Epoxidised Natural Rubber
- Die Extrusion
- Rheological Behaviour of HDPE/PA 11 Blends
- Melt Flow Properties of LDPE/HDPE Blends in Capillary Extrusion
- Fibers and Film
- Rheological Behaviour of LLDPE/LDPE Blends under Elongational Deformation
- Processing/Structure Relationships of Mica-Filled PE-Films with Low Oxygen Permeability
- On the Charge State of Melt-Blown Polymer Materials
- Temperature Measuring in Plastics Processing with Infrared Radiation Thermometers
- Comparative Study of Structure Development in Melt Spinning Polyolefin Fibers
- Moulding
- Sintering Rheology of Semi-Crystalline Polymers
- Molding
- Melt Flow Instabilities of Filled HDPE
- Experimental Validation of Shrinkage Predictions for Injection Molded Products
