Ultra-high molecular weight polyethylene (UHMWPE) fibers demonstrate high modulus and strength compared to other high-performance materials, especially when considered on a mass basis. While many studies have demonstrated these properties, questions remain regarding how drawing of the polymer fiber leads to the observed properties. For example, we don’t have a complete understanding of how the morphology of the as-spun fiber (ASF) influences the later stage morphology developments. Nor has the effect of strain rate during drawing been shown. In this work we probe the effect of various draw parameters that could be critical to the morphology, and therefore, the mechanical behavior of these materials. In this study we use a modified extensional rheometer (VADER 1000) to perform the drawing process on UHMWPE fibers. Various ASF structures can be generated as shown in a previous work. With the VADER 1000 we can monitor true stress and strain throughout the draw, and discover the mechanical properties prior to, and at, the failure point. Small and wide-angle x-ray scattering is used investigate the crystalline morphology. Various structural parameters are then correlated to the mechanical response. With this information a fundamental understanding of the post-drawing will be developed.

Impact of drawing on the structure and performance of ultra high molecular weight polyethylene fibers

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.