Stress relaxation in low-shrink-force polyolefin films

Arthur L. Bobovitch, Ami Sagron, Yakov Unigovski, Albert Jarashneli, Emmanuel M. Gutman

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The morphology and stress relaxation of coextruded five-layer LLDPE (linear low-density polyethylene)/EVA (ethylene-vinyl-acetate) copolymer films were studied. Increasing VA (vinyl acetate) content in EVA causes a decrease of shrink tension in the films, which can be explained by a decrease in amount of crystallinity. The relaxation time spectrum of the coextruded crosslinked LLDPE/EVA films is similar to the relaxation time spectrum of crosslinked LLDPE film at room temperature. However, at elevated temperatures, an additional peak appears on the spectrum of coextruded film. The cause of this peak is temperature- and stress-induced recrystallization of EVA during the relaxation test. This recrystallization was confirmed with DSC and wide angle X-ray analysis.

Original languageEnglish
Pages (from-to)1716-1720
Number of pages5
JournalPolymer Engineering and Science
Volume44
Issue number9
DOIs
StatePublished - 1 Sep 2004

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