Extensional flow-induced crystallization in polyethylene melt spinning

Nadkarni, V. M. ; Schultz, J. M. (1977) Extensional flow-induced crystallization in polyethylene melt spinning Journal of Polymer Science: Polymer Physics Edition, 15 (12). pp. 2151-2183. ISSN 0887-6266

Full text not available from this repository.

Official URL: http://onlinelibrary.wiley.com/doi/10.1002/pol.197...

Related URL: http://dx.doi.org/10.1002/pol.1977.180151210


Polyethylene was spun into a heated chamber, with the spin-line temperature controlled in the range of 90-120°C. Within narrow limits, the stretch rate of the fiber was also controlled. Spin-line and crystallization onset conditions were characterized. Characteristics of fibers as-spun were measured via wide-angle x-ray scattering (WAXS), density, scanning electron microscopy, and differential scanning calorimetry. Spin-line data indicate that elongational flow enhances crystallization rate and that time under spin-line conditions is an important parameter. Analysis of WAXS data shows a typical "b-axis radial' orientation, the details of which change with spin-line parameters. This orientation is consistent with growth of lamellar crystals on extended-chain fibrils (shishkebab model). Other physical data are also consistent with this microstructure. Microcamera x-ray patterns show a similarity of microstructure generation in spinning and drawing.

Item Type:Article
Source:Copyright of this article belongs to John Wiley & Sons, Inc..
ID Code:22590
Deposited On:24 Nov 2010 08:13
Last Modified:08 Jun 2011 06:44

Repository Staff Only: item control page