Degradation of LDPE LLDPE and HDPE in film extrusion

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding

Abstract

The degradation of different polyethylenes, LDPE, LLDPE, and HDPE, with and without antioxidants and at different oxygen concentrations in the polymer granulates have been studied in extrusion coating processing. The degradation was followed by On Line Rheometry, Size Exclusion Chromatography, Surface Oxidation Index measurements, and GC-MS Chromatography. The degradations starts in the extruder where primary radicals are formed which are subject the auto oxidation when oxygen is present. In the extruder, cross-linking and chain scission reactions are dominating at low and high melt temperatures, respectively, for LDPE, and chain scission is over all dominating for the more linear LLDPE and HDPE resins. Additives such as antioxidants react with primary radicals formed in the melt. Degradation taking place in the film between the die orifice and the quenching point is mainly related to the exposure time to air-oxygen. Melt temperatures above 280

Details

Authors
  • Thorbjorn Andersson
  • Bengt Wesslén
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Chemical Sciences

Keywords

  • Polymer melts, Surface oxidation, Film blowing
Original languageEnglish
Title of host publicationTAPPI European PLACE Conference
PublisherTAPPI
Pages333-359
Volume2
Publication statusPublished - 2003
Publication categoryResearch
Peer-reviewedYes
EventProceedings of the 2003 TAPPI European PLACE Conference - Rome, Italy
Duration: 2003 May 122003 May 14

Publication series

Name
Volume2

Conference

ConferenceProceedings of the 2003 TAPPI European PLACE Conference
CountryItaly
CityRome
Period2003/05/122003/05/14

Bibliographic note

The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Polymer and Materials Chemistry (LTH) (011001041)