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

A. L. Bobovitch, R. Tkach, A. Ajji, S. Elkoun, Y. Nir, Y. Unigovski, E. M. Gutman

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


Biaxially 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) blow-up 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 micro-structure 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 con stant 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.

Original languageEnglish
Pages (from-to)3545-3553
Number of pages9
JournalJournal of Applied Polymer Science
Issue number5
StatePublished - 5 Jun 2006


  • Mechanical properties
  • Morphology
  • Oriented films

ASJC Scopus subject areas

  • General Chemistry
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry


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