Fundamental understanding of the relationship between tear property and orientation/crystal morphology

Lizhi Liu, Mehmet Demirors, Rajen Patel, Byoung Ho Choi, Ken Anderson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

Tear (notched) is an important mechanical property of polymer films. However, the actual mechanism of tear is a complex process in plane stress condition. It is almost impossible to carry out an in-situ study of morphology, structure, and orientation development during a highspeed tear process, in order to understand the mechanism. In the present work, the tear path of a torn linear low density polyethylene (LLDPE) film was studied using micro-X-ray diffraction (XRD) and small angle X-ray scattering (SAXS). Crystals and amorphous segments become highly orientated very rapidly at initiation. The original crystals, rotated crystals, and the broken-up crystals can be differentiated by SAXS due to their orientation in different directions. Higher crystal and amorphous orientation was observed for LLDPE film after machine direction (MD) tear than after cross direction (CD) tear. This may explain why LLDPE films have lower MD tear strength than that of CD tear. At the end of the tearing path, all crystals are broken up and aligned much like a fiber along the tear path direction.

Original languageEnglish
Title of host publicationSociety of Plastics Engineers - 66th Annual Technical Conference of the Society of Plastics Engineers, Plastics Encounter at ANTEC 2008
Pages1346-1350
Number of pages5
Publication statusPublished - 2008
Event66th Annual Technical Conference of the Society of Plastics Engineers, Plastics Encounter at ANTEC 2008 - Milwaukee, WI, United States
Duration: 2008 May 42008 May 8

Publication series

NameTechnical Papers, Regional Technical Conference - Society of Plastics Engineers
Volume3

Other

Other66th Annual Technical Conference of the Society of Plastics Engineers, Plastics Encounter at ANTEC 2008
CountryUnited States
CityMilwaukee, WI
Period08/5/408/5/8

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Materials Chemistry
  • Polymers and Plastics

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  • Cite this

    Liu, L., Demirors, M., Patel, R., Choi, B. H., & Anderson, K. (2008). Fundamental understanding of the relationship between tear property and orientation/crystal morphology. In Society of Plastics Engineers - 66th Annual Technical Conference of the Society of Plastics Engineers, Plastics Encounter at ANTEC 2008 (pp. 1346-1350). (Technical Papers, Regional Technical Conference - Society of Plastics Engineers; Vol. 3).