NDLI: Orientation-dependent mechanical properties and deformation morphologies for uniaxially melt-extruded high-density polyethylene films having an initial stacked lamellar texture

Content Provider	Springer Nature Link
Author	Zhou, Hongyi Wilkes, G. L.
Copyright Year	1998
Abstract	The mechanical properties and the associated plastically deformed morphologies of high density polyethylene films were investigated by tensile testing, wide-angle X-ray scattering and transmission electron microscopy. Uniaxially oriented films having a well-defined stacked lamellar morphology, both with and without row-nucleated structure were deformed at three angles, 0°, 45° and 90°, with respect to the original machine (extrusion) direction. A distinct orientation dependence of the mechanical properties was observed and this dependence has been related to the different morphologies developed during the plastic deformation processes. It was shown that lamellar separation, lamellar shear and lamellar break-up were the dominant initial deformation mechanisms for the respective 0°, 45° and 90° deformations. As a result, the 45° and 90° deformations generated a final microfibril morphology oriented along the stretch direction, while the 0° deformation resulted in broken blocks of crystalline lamellae. The presence of distinct row-nucleated crystalline fibrils in the initial structure stiffens the material in the 0° deformation; however, it significantly limits the ability of the materials to cold draw at the 90° deformation. Morphological models were proposed to explain the plastic deformation process for the different deformation angles, as well as for the deformation behaviour of semicrystalline polymers with an isotropic spherulitic morphology.
Starting Page	287
Ending Page	303
Page Count	17
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	33
Issue Number	2
e-ISSN	15734803
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1998-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polymer Sciences Industrial Chemistry/Chemical Engineering Characterization and Evaluation Materials Mechanics
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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