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Polymers 2019, 11(3), 434;

Different Dependence of Tear Strength on Film Orientation of LLDPE Made with Different Co-Monomer

School of Science, Shenyang University of Technology, Shenyang 110027, China
Advanced Manufacturing Institute of Polymer Industry, Shenyang University of Chemical Technology, Shenyang 110027, China
SINOPEC Beijing Research Institute of Chemical Industry, Beijing 100176, China
Author to whom correspondence should be addressed.
Received: 19 January 2019 / Revised: 17 February 2019 / Accepted: 26 February 2019 / Published: 6 March 2019
(This article belongs to the Special Issue Mechanical Behavior of Polymers)
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Crystal orientations, tear strength and shrinkage of Linear Low-Density PolyEthylene (LLDPE) films made with different processes (compressed, cast and blown) were investigated. The films were made with three different LLDPE resins, respectively, which have similar density and molecular weight but are made with different comonomers (1-butene, 1-hexene and 1-octene), in order to investigate if tear strength in Machine Direction (MD) of the LLDPE films made with different comonomer has similar dependence on crystal orientation. Our study indicates that the films made of 1-hexene and 1-octene based LLDPE resins have significantly higher intrinsic tear strength and less decrease in MD tear strength for a given film orientation. That is, for a given orientation in MD, the MD tear drops dramatically for films made with butene-based resin but much less decrease for the films made with hexene and octene-based resins. The shrinkage property at high temperature shows a good correlation with crystal orientation and the fraction of the crystals melted at this temperature. View Full-Text
Keywords: LLDPE; tear strength; orientation; film; shrinkage LLDPE; tear strength; orientation; film; shrinkage

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Ren, Y.; Shi, Y.; Yao, X.; Tang, Y.; Liu, L.-Z. Different Dependence of Tear Strength on Film Orientation of LLDPE Made with Different Co-Monomer. Polymers 2019, 11, 434.

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