Structure Development in Melt Spinning and Cold Drawing of Poly(ethylene-co-octene) Copolymer
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H. Shan
Abstract
An experimental study of melt spinning and cold drawing of polyethylene and its Dow Chemical INSITEØ catalyst octene copolymers was carried out. The structure and morphology of both melt spun and cold drawing fibers were investigated using wide angle x-ray diffraction (WAXD), small angle x-ray scattering (SAXS), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and birefringence. Up to 5.9 mol.% octene, the fibers exhibit only the Bunn orthorhombic crystal structure. Fibers with 9.7 mol.% and 13.3 mol.% octene, whose DSC crystallinity is 0.23 and below, have an additional reflection at about 0.45nm. The Hermans-Stein orientation factors for the melt spun fibers were determined and correlated with spinline stress. Cold drawn polyethylene fibers exhibited additional reflection at 0.45, 0.38 and 0.35nm which may be associated with the Tanaka-Seto et al. monoclinic unit cell. The copolymers contained a decreased monoclinic level which disappears at about 5.9 mol.%. However, a broad reflection at 0.45nm, reappears at 9.7 mol.% octene. This reflection is also present at the 13.3 mol.% level. It is surmised that a pseudohexagonal or mesomorphic structure is developing. The Hermans-Stein orientation factors were determined for the drawn fibers as a function of cold draw ratio. Drawing results in high crystalline orientation and fibrillation for polyethylene fibers. For copolymers, with higher octene content, the fibrillation decreases.
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© 2006, Hanser Publishers, Munich
Artikel in diesem Heft
- Contents
- Contents
- Regular Contributed Articles
- A Study of Integration of LIGA and M-EDM Technology on the Micro Injection Molding of Super Thin Plates with Micro Through Holes
- Carbon Black Filled Polyester as Electrically Conductive Master Batch for Fibers
- Tip-clearance Effect on Mixing Performance of Twin Screw Extruders
- Structure Development in Melt Spinning and Cold Drawing of Poly(ethylene-co-octene) Copolymer
- Effect of Distributor Geometry on Crimp Contraction of PET Side-by-side Bicomponent Fibers
- Effect of Compatibilizer Distribution on Thermal and Rheological Properties of Gelatinized Starch/Biodegradable Polyesters Blends
- Numerical Simulation of the Effect of Processing Parameters on the Flow Behavior and Break-through Phenomenon in Co-Injection Molding
- Study of Shrinkage and Warpage in Microcellular Co-Injection Molding
- Melting Temperature Characteristics for Polyethylenes from Crystal Size Distribution
- Experimental/Numerical Analysis of Chaotic Advection in a Three-dimensional Cavity Flow
- A Numerical Investigation on the Cure Cycle of Composite Brake Blocks
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts
Artikel in diesem Heft
- Contents
- Contents
- Regular Contributed Articles
- A Study of Integration of LIGA and M-EDM Technology on the Micro Injection Molding of Super Thin Plates with Micro Through Holes
- Carbon Black Filled Polyester as Electrically Conductive Master Batch for Fibers
- Tip-clearance Effect on Mixing Performance of Twin Screw Extruders
- Structure Development in Melt Spinning and Cold Drawing of Poly(ethylene-co-octene) Copolymer
- Effect of Distributor Geometry on Crimp Contraction of PET Side-by-side Bicomponent Fibers
- Effect of Compatibilizer Distribution on Thermal and Rheological Properties of Gelatinized Starch/Biodegradable Polyesters Blends
- Numerical Simulation of the Effect of Processing Parameters on the Flow Behavior and Break-through Phenomenon in Co-Injection Molding
- Study of Shrinkage and Warpage in Microcellular Co-Injection Molding
- Melting Temperature Characteristics for Polyethylenes from Crystal Size Distribution
- Experimental/Numerical Analysis of Chaotic Advection in a Three-dimensional Cavity Flow
- A Numerical Investigation on the Cure Cycle of Composite Brake Blocks
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts
