Mechanical properties, stress-relaxation and orientation of double bubble biaxially oriented polyethylene films

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DOIResolve DOI: http://doi.org/10.1002/app.22727
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TypeArticle
Journal titleJournal of Applied Polymer Science
ISSN1097-4628
0021-8995
Volume100
Issue5
Pages35453553; # of pages: 8
Subjectmorphology; oriented films; mechanical properties
AbstractBiaxially oriented linear low density polyethylene (LLDPE) films were produced using the double bubble process with different machine direction (MD) orientation levels and the same transverse direction (TD) blowup ratio. Their mechanical behavior was characterized in terms of the tensile strength and tear resistance. The viscoelastic behavior of oriented films was studied using dynamic- mechanical thermal analysis (DMTA). The microstructure and orientation were characterized using microscopy, X-ray diffraction pole figures, and birefringence. The results indicate that MD ultimate tensile strength increases and the TD one decreases with MD stretching ratio. Tear propagation resistance, in general, remained mainly constant in TD and decreased in MD, as the draw ratio was increased. The morphology analyses exhibit a typical biaxial lamellar structure for all samples with different lamellar dimensions. Orientation of c-axis in crystalline phase, molecular chain in amorphous phase along MD increased with draw ratio. In most crystals, a-axis was located in the normal direction (ND) and the b-axis in the ND–TD plane. A good correlation was observed between c-axis orientation factor and MD mechanical properties. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 3545–3553, 2006
Publication date
PublisherJohn Wiley and Sons
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute
Peer reviewedYes
NRC number53740
NPARC number15905577
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Record identifier49282688-e9e4-4f98-b039-9714fb6a2989
Record created2010-08-17
Record modified2016-05-09
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