The preparation of multiaxially oriented polyethylene morphologies with high mechanical properties in planar direactions
✍ Scribed by Anagnostis E. Zachariades
- Publisher
- John Wiley and Sons
- Year
- 1984
- Tongue
- English
- Weight
- 882 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
The development of multiaxially oriented films of low molecular weight (M, = 59,000) high density polyethylene with high mechanical properties in planar directions has been pursued by inducing fibrillar crystallization under curvilinear flow conditions in a contained geometry using an extrudomolding process and by simulating similar crystallization conditions in an optical plate-plate rheometer. The films, like the uniaxially drawn morphologies of the same low molecular weight high density polyethylene by solid-state extrusion, had a high modulus (12-20 GPa) and strength (0.25 GPa) along the residual flow lines but they exhibited also a modulus enhancement (5 GPa) in the transverse direction as a result of the orientation gradient of the molecular chains in the thickness directions.