Abstract
Structural differences between two commercial poly(p-phenyleneterephthalamide) (Kevlar) fibres were studied with scanning electron microscopy and wide angle X-ray scattering. Compared with Kevlar 49, fibres of Kevlar 149 had higher crystallite orientation, larger crystallite size and/or reduced crystalline disorder, and did not display the 300-500 nm axially periodic, pleated sheet structure of Kevlar 49. The high tensile modulus of Kevlar 149 (179 GPa), which is 80-90% of the theoretically predicted value, is attributed to the permanent 'straightening' of the pleated sheet structure associated with increased orientation and improved crystallite ordering.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 10-13 |
| Number of pages | 4 |
| Journal | Polymer communications Guildford |
| Volume | 30 |
| Issue number | 1 |
| State | Published - Jan 1 1989 |
ASJC Scopus subject areas
- General Engineering