Structural hierarchy and surface morphology of highly drawn ultra high molecular weight polyethylene fibers studied by atomic force microscopy and wide angle X-ray diffraction

Structural hierarchy and surface morphology of highly drawn ultra high molecular weight polyethylene fibers studied by atomic force microscopy and wide angle X-ray diffraction

The meso/nanostructure of UHMWPE fibers manufactured using different processing conditions is explored through atomic force microscopy (AFM) and wide-angle X-ray diffraction (WAXD). Characteristic dimensions of sub-filament microstructure are quantified at the fiber surface and the fiber interior. T...

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Bibliographic Details
Published in:Polymer (Guilford) 2015-07, Vol.69, p.148-158
Main Authors: McDaniel, Preston B., Deitzel, Joseph M., Gillespie, John W.
Format: Article
Language:eng
Subjects:
Atomic force microscopy
Diffraction
Epitaxy
Fibers
High performance fibers
Nanostructure
Networks
Polyethylenes
Structural hierarchy
Ultra high molecular weight polyethylene
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Summary:The meso/nanostructure of UHMWPE fibers manufactured using different processing conditions is explored through atomic force microscopy (AFM) and wide-angle X-ray diffraction (WAXD). Characteristic dimensions of sub-filament microstructure are quantified at the fiber surface and the fiber interior. These measurements are compared to crystalline parameters determined using WAXD. Observation of junctions between microfibrils suggests the original gel network from which the fiber was drawn remain in the final product. For fibers having undergone greater drawing, the fiber surface reveals the presence of large-scale epitaxial features oriented perpendicular to the direction of drawing. Annealing experiments show that epitaxial structures undergo thickening at temperatures >120 °C. Examining fiber cross-sections reveals a network of microfibrils that appear to undergo consolidation with increased drawing. The evolution of the structural hierarchy of these fibers is discussed in the context of its implications for optimization of processing both fibers and their composites. [Display omitted] •Epitaxial surface features serve as markers of high temperature processing.•Narrowing fibril diameter distribution homogenizes stress distribution in tension.•3D fibrillar network identified in highly drawn fibers.•Fibril consolidation in drawn fibers results in increased fibrillar interaction.
ISSN:0032-3861
1873-2291