On the link between nonlinear extensional rheology and morphology of polymeric fibers

Sara Lindeblad Wingstrand

Research output: Book/ReportPh.D. thesis

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Abstract

The mechanical properties of semi-crystalline polymeric products are highly dependent on morphology obtained during processing. For example, an ultra-high modulus polyethylene fiber owes its strength to the formation of extended chain crystals rather than folded chain crystals during fiber spinning. The imposed rate of deformation along with the molecular architecture of the polymer determines the extent of molecular deformation in the flow and which, in turn, dictates the morphology of the final product. Rheology, commonly known as "the study of flow", can link molecular architecture to the final morphology. While numerous experimental investigations on the effect of shear flow on crystallization and the final morphology of semicrystalline materials exists, analogous studies performed in extension are much more limited. This is due to experimental difficulties that only recently have been resolved with development of the filament stretching rheometer.
Original languageEnglish
Place of PublicationKgs. Lyngby
PublisherTechnical University of Denmark
Number of pages149
Publication statusPublished - 2017

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