NDLI: Structure-Property Relationships: Model Studies on Melt Extruded Uniaxially Oriented High Density Polyethylene Films Having Well Defined Morphologies

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Structure-Property Relationships: Model Studies on Melt Extruded Uniaxially Oriented High Density Polyethylene Films Having Well Defined Morphologies

Content Provider	Semantic Scholar
Author	Zhou, Hong-Yi
Copyright Year	1997
Abstract	High density polyethylene (HDPE) films having simple and well-defined stacked lamellar morphology, either with or without a distinct presence of row-nucleated fibril structures, have been utilized as model materials to carry out investigations on solid state structure-property relationships. Four different subjects that were addressed are: 1) mechanical properties and deformation morphologies, 2) orientation anisotropy of the dynamic mechanical α relaxation, 3) orientation dependence of creep behavior, and 4) crystalline lamellar thickness and its distribution. For the first three topics, appropriate mechanical tests, including tensile (INSTRON), creep (TMA), and dynamic mechanical (DMTA) tests, were performed at different angles with respect to the original machine direction (MD) of the melt extruded films; morphological changes as a result of these mechanical tests were detected by WAXS, SAXS, and TEM. For the forth topic, crystalline lamellar thickness and its distribution were determined by DSC, SAXS, TEM and AFM experiments. In the large strain deformation study (chapter 4.0), samples were stretched at 00°, 45° and 90° angles with respect to the original MD. A distinct orientation dependence of the tensile behavior was observed and correlated to the corresponding deformation modes and morphological changes, namely 1) lamellar separation and fragmentation by chain slip for the 00° stretch, 2) lamellar break-up via chain pull-out for the 90° stretch, and 3) lamellar shear, rotation
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://theses.lib.vt.edu/theses/available/etd-33501632971610/unrestricted/etd.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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